Articles | Volume 15, issue 6
Biogeosciences, 15, 1843–1862, 2018
https://doi.org/10.5194/bg-15-1843-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Biogeosciences, 15, 1843–1862, 2018
https://doi.org/10.5194/bg-15-1843-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
29 Mar 2018
Research article
| 29 Mar 2018
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone
Andrés S. Rigual Hernández et al.
Related authors
Andrés S. Rigual Hernández, Thomas W. Trull, Scott D. Nodder, José A. Flores, Helen Bostock, Fátima Abrantes, Ruth S. Eriksen, Francisco J. Sierro, Diana M. Davies, Anne-Marie Ballegeer, Miguel A. Fuertes, and Lisa C. Northcote
Biogeosciences, 17, 245–263, https://doi.org/10.5194/bg-17-245-2020, https://doi.org/10.5194/bg-17-245-2020, 2020
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Coccolithophores account for a major fraction of the carbonate produced in the world's oceans. However, their contribution in the subantarctic Southern Ocean remains undocumented. We quantitatively partition calcium carbonate fluxes amongst coccolithophore species in the Australian–New Zealand sector of the Southern Ocean. We provide new insights into the importance of species other than Emiliania huxleyi in the carbon cycle and assess their possible response to projected environmental change.
A. S. Rigual-Hernández, T. W. Trull, S. G. Bray, A. Cortina, and L. K. Armand
Biogeosciences, 12, 5309–5337, https://doi.org/10.5194/bg-12-5309-2015, https://doi.org/10.5194/bg-12-5309-2015, 2015
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Diatom and major components of the flux collected by two sediment traps in subantarctic and polar frontal zones were studied. Despite significant differences in the composition and magnitude of the flux, POC flux was similar between sites. The development of a group of bloom-forming diatoms during summer led to the formation of aggregates and enhanced POC export. Our results suggest that high biogenic silica accumulation rates should be interpreted as a proxy for iron-limited diatom assemblages.
José Guitián, Miguel Ángel Fuertes, José-Abel Flores, Iván Hernández-Almeida, and Heather Stoll
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-66, https://doi.org/10.5194/bg-2022-66, 2022
Preprint under review for BG
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The effect of environmental conditions on the degree of calcification of marine phytoplankton remains unclear. This study implements a new microscopic approach to quantify the calcification of ancient coccolithophores, using North Atlantic sediments. Results show significant differences in thickness and shape factor of coccoliths for samples with minimum dissolution, providing the first evaluation of phytoplankton physiology adaptation to million-year scale variable environmental conditions.
Molly O. Patterson, Richard H. Levy, Denise K. Kulhanek, Tina van de Flierdt, Huw Horgan, Gavin B. Dunbar, Timothy R. Naish, Jeanine Ash, Alex Pyne, Darcy Mandeno, Paul Winberry, David M. Harwood, Fabio Florindo, Francisco J. Jimenez-Espejo, Andreas Läufer, Kyu-Cheul Yoo, Osamu Seki, Paolo Stocchi, Johann P. Klages, Jae Il Lee, Florence Colleoni, Yusuke Suganuma, Edward Gasson, Christian Ohneiser, José-Abel Flores, David Try, Rachel Kirkman, Daleen Koch, and the SWAIS 2C Science Team
Sci. Dril., 30, 101–112, https://doi.org/10.5194/sd-30-101-2022, https://doi.org/10.5194/sd-30-101-2022, 2022
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How much of the West Antarctic Ice Sheet will melt and how quickly it will happen when average global temperatures exceed 2 °C is currently unknown. Given the far-reaching and international consequences of Antarctica’s future contribution to global sea level rise, the SWAIS 2C Project was developed in order to better forecast the size and timing of future changes.
Christina Schallenberg, Robert F. Strzepek, Nina Schuback, Lesley A. Clementson, Philip W. Boyd, and Thomas W. Trull
Biogeosciences, 17, 793–812, https://doi.org/10.5194/bg-17-793-2020, https://doi.org/10.5194/bg-17-793-2020, 2020
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Measurements of phytoplankton health still require the use of research vessels and are thus costly and sparse. In this paper we propose a new way to assess the health of phytoplankton using simple fluorescence measurements, which can be made autonomously. In the Southern Ocean, where the most limiting nutrient for phytoplankton is iron, we found a relationship between iron limitation and the depression of fluorescence under high light, the so-called non-photochemical quenching of fluorescence.
Andrés S. Rigual Hernández, Thomas W. Trull, Scott D. Nodder, José A. Flores, Helen Bostock, Fátima Abrantes, Ruth S. Eriksen, Francisco J. Sierro, Diana M. Davies, Anne-Marie Ballegeer, Miguel A. Fuertes, and Lisa C. Northcote
Biogeosciences, 17, 245–263, https://doi.org/10.5194/bg-17-245-2020, https://doi.org/10.5194/bg-17-245-2020, 2020
Short summary
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Coccolithophores account for a major fraction of the carbonate produced in the world's oceans. However, their contribution in the subantarctic Southern Ocean remains undocumented. We quantitatively partition calcium carbonate fluxes amongst coccolithophore species in the Australian–New Zealand sector of the Southern Ocean. We provide new insights into the importance of species other than Emiliania huxleyi in the carbon cycle and assess their possible response to projected environmental change.
Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Miguel Ángel Fuertes, Hartmut Schulz, Yann Marcon, Nele Manon Vollmar, José-Abel Flores, and Frank Lamy
Biogeosciences, 16, 3679–3702, https://doi.org/10.5194/bg-16-3679-2019, https://doi.org/10.5194/bg-16-3679-2019, 2019
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Open ocean phytoplankton include coccolithophore algae, a key element in carbon cycle regulation with important feedbacks to the climate system. We document latitudinal variability in both coccolithophore assemblage and the mass variation in one particular species, Emiliania huxleyi, for a transect across the Drake Passage (in the Southern Ocean). Coccolithophore abundance, diversity and maximum depth habitat decrease southwards, coinciding with changes in the predominant E. huxleyi morphotypes.
Adrienne J. Sutton, Richard A. Feely, Stacy Maenner-Jones, Sylvia Musielwicz, John Osborne, Colin Dietrich, Natalie Monacci, Jessica Cross, Randy Bott, Alex Kozyr, Andreas J. Andersson, Nicholas R. Bates, Wei-Jun Cai, Meghan F. Cronin, Eric H. De Carlo, Burke Hales, Stephan D. Howden, Charity M. Lee, Derek P. Manzello, Michael J. McPhaden, Melissa Meléndez, John B. Mickett, Jan A. Newton, Scott E. Noakes, Jae Hoon Noh, Solveig R. Olafsdottir, Joseph E. Salisbury, Uwe Send, Thomas W. Trull, Douglas C. Vandemark, and Robert A. Weller
Earth Syst. Sci. Data, 11, 421–439, https://doi.org/10.5194/essd-11-421-2019, https://doi.org/10.5194/essd-11-421-2019, 2019
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Long-term observations are critical records for distinguishing natural cycles from climate change. We present a data set of 40 surface ocean CO2 and pH time series that suggests the time length necessary to detect a trend in seawater CO2 due to uptake of atmospheric CO2 varies from 8 years in the least variable ocean regions to 41 years in the most variable coastal regions. This data set provides a tool to evaluate natural cycles of ocean CO2, with long-term trends emerging as records lengthen.
Gloria M. Martin-Garcia, Francisco J. Sierro, José A. Flores, and Fátima Abrantes
Clim. Past, 14, 1639–1651, https://doi.org/10.5194/cp-14-1639-2018, https://doi.org/10.5194/cp-14-1639-2018, 2018
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This work documents major oceanographic changes that occurred in the N. Atlantic from 812 to 530 ka and were related to the mid-Pleistocene transition. Since ~ 650 ka, glacials were more prolonged and intense than before. Larger ice sheets may have worked as a positive feedback mechanism to prolong the duration of glacials. We explore the connection between the change in the N. Atlantic oceanography and the enhanced ice-sheet growth, which contributed to the change of cyclicity in climate.
Ariadna Salabarnada, Carlota Escutia, Ursula Röhl, C. Hans Nelson, Robert McKay, Francisco J. Jiménez-Espejo, Peter K. Bijl, Julian D. Hartman, Stephanie L. Strother, Ulrich Salzmann, Dimitris Evangelinos, Adrián López-Quirós, José Abel Flores, Francesca Sangiorgi, Minoru Ikehara, and Henk Brinkhuis
Clim. Past, 14, 991–1014, https://doi.org/10.5194/cp-14-991-2018, https://doi.org/10.5194/cp-14-991-2018, 2018
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Here we reconstruct ice sheet and paleoceanographic configurations in the East Antarctic Wilkes Land margin based on a multi-proxy study conducted in late Oligocene (26–25 Ma) sediments from IODP Site U1356. The new obliquity-forced glacial–interglacial sedimentary model shows that, under the high CO2 values of the late Oligocene, ice sheets had mostly retreated to their terrestrial margins and the ocean was very dynamic with shifting positions of the polar fronts and associated water masses.
Saúl González-Lemos, José Guitián, Miguel-Ángel Fuertes, José-Abel Flores, and Heather M. Stoll
Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, https://doi.org/10.5194/bg-15-1079-2018, 2018
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Changes in atmospheric carbon dioxide affect ocean chemistry and the ability of marine organisms to manufacture shells from calcium carbonate. We describe a technique to obtain more reproducible measurements of the thickness of calcium carbonate shells made by microscopic marine algae called coccolithophores, which will allow researchers to compare how the shell thickness responds to variations in ocean chemistry in the past and present.
Blanca Ausín, Diana Zúñiga, Jose A. Flores, Catarina Cavaleiro, María Froján, Nicolás Villacieros-Robineau, Fernando Alonso-Pérez, Belén Arbones, Celia Santos, Francisco de la Granda, Carmen G. Castro, Fátima Abrantes, Timothy I. Eglinton, and Emilia Salgueiro
Biogeosciences, 15, 245–262, https://doi.org/10.5194/bg-15-245-2018, https://doi.org/10.5194/bg-15-245-2018, 2018
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A systematic investigation of the coccolithophore ecology was performed for the first time in the NW Iberian Margin to broaden our knowledge on the use of fossil coccoliths in marine sediment records to infer environmental conditions in the past. Coccolithophores proved to be significant primary producers and their abundance and distribution was favoured by warmer and nutrient–depleted waters during the upwelling regime, seasonally controlled offshore and influenced by coastal processes onshore.
Thomas W. Trull, Abraham Passmore, Diana M. Davies, Tim Smit, Kate Berry, and Bronte Tilbrook
Biogeosciences, 15, 31–49, https://doi.org/10.5194/bg-15-31-2018, https://doi.org/10.5194/bg-15-31-2018, 2018
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We present the first large-scale survey of planktonic biogenic carbonate concentrations south of Australia, accompanied by biogenic silica and particulate organic carbon. These suggest that coccolithophores are largely restricted to subantarctic waters and are present in much lower abundance than in Northern Hemisphere polar waters. Comparison to upper ocean properties suggests that thermal tolerance and competition with diatoms for limiting iron may be as influential as ocean acidification.
Paula Conde Pardo, Bronte Tilbrook, Clothilde Langlais, Thomas William Trull, and Stephen Rich Rintoul
Biogeosciences, 14, 5217–5237, https://doi.org/10.5194/bg-14-5217-2017, https://doi.org/10.5194/bg-14-5217-2017, 2017
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The carbon content of the water masses of the Southern Ocean south of Tasmania has increased over the period 1995–2011, leading to a general decrease in pH. An enhancement in the upwelling of DIC-rich deep waters is the main plausible cause of the increase in carbon in surface waters south of the Polar Front. North of the Polar Front, strong winds favor the ventilation of surface to intermediate layers, where the DIC increase is explained by the uptake of atmospheric CO2.
B. Ausín, I. Hernández-Almeida, J.-A. Flores, F.-J. Sierro, M. Grosjean, G. Francés, and B. Alonso
Clim. Past, 11, 1635–1651, https://doi.org/10.5194/cp-11-1635-2015, https://doi.org/10.5194/cp-11-1635-2015, 2015
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Coccolithophore distribution in 88 surface sediment samples in the Atlantic Ocean and western Mediterranean was mainly influenced by salinity at 10m depth. A quantitative coccolithophore-based transfer function was developed and applied to a fossil sediment core to estimate sea surface salinity (SSS). The quality of this function and the reliability of the SSS reconstruction were assessed by statistical analyses and discussed. Several centennial SSS changes are identified for the last 15.5 ka.
M. N. Müller, J. Barcelos e Ramos, K. G. Schulz, U. Riebesell, J. Kaźmierczak, F. Gallo, L. Mackinder, Y. Li, P. N. Nesterenko, T. W. Trull, and G. M. Hallegraeff
Biogeosciences, 12, 6493–6501, https://doi.org/10.5194/bg-12-6493-2015, https://doi.org/10.5194/bg-12-6493-2015, 2015
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The White Cliffs of Dover date back to the Cretaceous and are made up of microscopic chalky shells which were produced mainly by marine phytoplankton (coccolithophores). This is iconic proof for their success at times of relatively high seawater calcium concentrations and, as shown here, to be linked to their ability to precipitate calcium as chalk. The invention of calcification can thus be considered an evolutionary milestone allowing coccolithophores to thrive at times when others struggled.
O. Rama-Corredor, B. Martrat, J. O. Grimalt, G. E. López-Otalvaro, J. A. Flores, and F. Sierro
Clim. Past, 11, 1297–1311, https://doi.org/10.5194/cp-11-1297-2015, https://doi.org/10.5194/cp-11-1297-2015, 2015
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The alkenone sea surface temperatures in the Guiana Basin show a rapid transmission of the climate variability from arctic to tropical latitudes during the last two interglacials (MIS1 and MIS5e) and warm long interstadials (MIS5d-a). In contrast, the abrupt variability of the glacial interval does follow the North Atlantic climate but is also shaped by precessional changes. This arctic to tropical decoupling occurs when the Atlantic meridional overturning circulation is substantially reduced.
A. S. Rigual-Hernández, T. W. Trull, S. G. Bray, A. Cortina, and L. K. Armand
Biogeosciences, 12, 5309–5337, https://doi.org/10.5194/bg-12-5309-2015, https://doi.org/10.5194/bg-12-5309-2015, 2015
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Diatom and major components of the flux collected by two sediment traps in subantarctic and polar frontal zones were studied. Despite significant differences in the composition and magnitude of the flux, POC flux was similar between sites. The development of a group of bloom-forming diatoms during summer led to the formation of aggregates and enhanced POC export. Our results suggest that high biogenic silica accumulation rates should be interpreted as a proxy for iron-limited diatom assemblages.
A. R. Bowie, P. van der Merwe, F. Quéroué, T. Trull, M. Fourquez, F. Planchon, G. Sarthou, F. Chever, A. T. Townsend, I. Obernosterer, J.-B. Sallée, and S. Blain
Biogeosciences, 12, 4421–4445, https://doi.org/10.5194/bg-12-4421-2015, https://doi.org/10.5194/bg-12-4421-2015, 2015
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Iron biogeochemical budgets during the natural ocean fertilisation experiment KEOPS-2 showed that complex circulation and transport pathways were responsible for differences in the mode and strength of iron supply, with vertical supply dominant on the plateau and lateral supply dominant in the plume. The exchange of iron between dissolved, biogenic and lithogenic pools was highly dynamic, resulting in a decoupling of iron supply and carbon export and controlling the efficiency of fertilization.
F. Planchon, D. Ballas, A.-J. Cavagna, A. R. Bowie, D. Davies, T. Trull, E. C. Laurenceau-Cornec, P. Van Der Merwe, and F. Dehairs
Biogeosciences, 12, 3831–3848, https://doi.org/10.5194/bg-12-3831-2015, https://doi.org/10.5194/bg-12-3831-2015, 2015
M. Grenier, A. Della Penna, and T. W. Trull
Biogeosciences, 12, 2707–2735, https://doi.org/10.5194/bg-12-2707-2015, https://doi.org/10.5194/bg-12-2707-2015, 2015
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Four bio-profilers were deployed in the high-biomass plume downstream of the Kerguelen Plateau (KP; Southern Ocean) to examine the conditions favouring phytoplankton accumulation. Regions of very high Chla accumulation were mainly associated with surface waters from the northern KP. Light limitation seems to have a limited influence on production. A cyclonic eddy was associated with a significant export of organic matter and a subsequent dissolved inorganic carbon storage in the ocean interior.
I. Hernández-Almeida, F.-J. Sierro, I. Cacho, and J.-A. Flores
Clim. Past, 11, 687–696, https://doi.org/10.5194/cp-11-687-2015, https://doi.org/10.5194/cp-11-687-2015, 2015
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This manuscript presents new Mg/Ca and previously published δ18O measurements of Neogloboquadrina pachyderma sinistral for MIS 31-19, from a sediment core from the subpolar North Atlantic. The mechanism proposed here involves northward subsurface transport of warm and salty subtropical waters during periods of weaker AMOC, leading to ice-sheet instability and IRD discharge. This is the first time that these rapid climate oscillations are described for the early Pleistocene.
M. Fourquez, I. Obernosterer, D. M. Davies, T. W. Trull, and S. Blain
Biogeosciences, 12, 1893–1906, https://doi.org/10.5194/bg-12-1893-2015, https://doi.org/10.5194/bg-12-1893-2015, 2015
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In this manuscript, we present the results of iron uptake measured in the naturally iron-fertilized area during the Kerguelen Ocean and Plateau compared Study 2 cruise (KEOPS2). Iron uptake by bulk community and several size fractions (microplankton, pico-nanoplankton and bacteria) are presented, compared and discussed in the present paper. This work also presents first investigations on the potential competition between bacteria and phytoplankton for access to iron.
T. W. Trull, D. M. Davies, F. Dehairs, A.-J. Cavagna, M. Lasbleiz, E. C. Laurenceau-Cornec, F. d'Ovidio, F. Planchon, K. Leblanc, B. Quéguiner, and S. Blain
Biogeosciences, 12, 1029–1056, https://doi.org/10.5194/bg-12-1029-2015, https://doi.org/10.5194/bg-12-1029-2015, 2015
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The KEOPS2 oceanographic study surveyed more than 30 sites downstream from the Kerguelen Islands in the Southern Ocean to examine the degree of variation in phytoplankton community responses to natural iron inputs. Our observations of community structure based on the chemical compositions of six microbial size fractions suggest that early spring trophodynamic and export responses differed between regions with persistently low levels versus punctually high levels of iron fertilisation.
E. C. Laurenceau-Cornec, T. W. Trull, D. M. Davies, S. G. Bray, J. Doran, F. Planchon, F. Carlotti, M.-P. Jouandet, A.-J. Cavagna, A. M. Waite, and S. Blain
Biogeosciences, 12, 1007–1027, https://doi.org/10.5194/bg-12-1007-2015, https://doi.org/10.5194/bg-12-1007-2015, 2015
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Biogeosciences, 19, 3185–3208, https://doi.org/10.5194/bg-19-3185-2022, https://doi.org/10.5194/bg-19-3185-2022, 2022
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Biogeosciences, 19, 2417–2426, https://doi.org/10.5194/bg-19-2417-2022, https://doi.org/10.5194/bg-19-2417-2022, 2022
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In oceanic waters, the accumulation of phytoplankton biomass in winter, when light still limits growth, is attributed to a decrease in grazing as the mixed layer deepens. However, in coastal areas, it is not clear whether winter biomass can accumulate without this deepening. Using 21 years of weekly data, we found that in the Scottish coastal North Sea, the seasonal increase in light availability triggers the accumulation of phytoplankton biomass in winter, when light limitation is strongest.
Birgit Koehler, Mårten Erlandsson, Martin Karlsson, and Lena Bergström
Biogeosciences, 19, 2295–2312, https://doi.org/10.5194/bg-19-2295-2022, https://doi.org/10.5194/bg-19-2295-2022, 2022
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Understanding species richness patterns remains a challenge for biodiversity management. We estimated fish species richness over a coastal salinity gradient (3–32) with a method that allowed comparing data from various sources. Species richness was 3-fold higher at high vs. low salinity, and salinity influenced species’ habitat preference, mobility and feeding type. If climate change causes upper-layer freshening of the Baltic Sea, further shifts along the identified patterns may be expected.
Uri Obolski, Thomas Wichard, Alvaro Israel, Alexander Golberg, and Alexander Liberzon
Biogeosciences, 19, 2263–2271, https://doi.org/10.5194/bg-19-2263-2022, https://doi.org/10.5194/bg-19-2263-2022, 2022
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The algal genus Ulva plays a major role in coastal ecosystems worldwide and is a promising prospect as an seagriculture crop. A substantial hindrance to cultivating Ulva arises from sudden sporulation, leading to biomass loss. This process is not yet well understood. Here, we characterize the dynamics of Ulva growth, considering the potential impact of sporulation inhibitors, using a mathematical model. Our findings are an essential step towards understanding the dynamics of Ulva growth.
Emanuela Fanelli, Samuele Menicucci, Sara Malavolti, Andrea De Felice, and Iole Leonori
Biogeosciences, 19, 1833–1851, https://doi.org/10.5194/bg-19-1833-2022, https://doi.org/10.5194/bg-19-1833-2022, 2022
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Zooplankton play a key role in marine ecosystems, forming the base of the marine food web and a link between primary producers and higher-order consumers, such as fish. This aspect is crucial in the Adriatic basin, one of the most productive and overexploited areas of the Mediterranean Sea. A better understanding of community and food web structure and their response to water mass changes is essential under a global warming scenario, as zooplankton are sensitive to climate change.
Masaya Yoshikai, Takashi Nakamura, Rempei Suwa, Sahadev Sharma, Rene Rollon, Jun Yasuoka, Ryohei Egawa, and Kazuo Nadaoka
Biogeosciences, 19, 1813–1832, https://doi.org/10.5194/bg-19-1813-2022, https://doi.org/10.5194/bg-19-1813-2022, 2022
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This study presents a new individual-based vegetation model to investigate salinity control on mangrove productivity. The model incorporates plant hydraulics and tree competition and predicts unique and complex patterns of mangrove forest structures that vary across soil salinity gradients. The presented model does not hold an empirical expression of salinity influence on productivity and thus may provide a better understanding of mangrove forest dynamics in future climate change.
Coulson A. Lantz, William Leggat, Jessica L. Bergman, Alexander Fordyce, Charlotte Page, Thomas Mesaglio, and Tracy D. Ainsworth
Biogeosciences, 19, 891–906, https://doi.org/10.5194/bg-19-891-2022, https://doi.org/10.5194/bg-19-891-2022, 2022
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Coral bleaching events continue to drive the degradation of coral reefs worldwide. In this study we measured rates of daytime coral reef community calcification and photosynthesis during a reef-wide bleaching event. Despite a measured decline in coral health across several taxa, there was no change in overall daytime community calcification and photosynthesis. These findings highlight potential limitations of these community-level metrics to reflect actual changes in coral health.
Hyewon Heather Kim, Jeff S. Bowman, Ya-Wei Luo, Hugh W. Ducklow, Oscar M. Schofield, Deborah K. Steinberg, and Scott C. Doney
Biogeosciences, 19, 117–136, https://doi.org/10.5194/bg-19-117-2022, https://doi.org/10.5194/bg-19-117-2022, 2022
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Heterotrophic marine bacteria are tiny organisms responsible for taking up organic matter in the ocean. Using a modeling approach, this study shows that characteristics (taxonomy and physiology) of bacteria are associated with a subset of ecological processes in the coastal West Antarctic Peninsula region, a system susceptible to global climate change. This study also suggests that bacteria will become more active, in particular large-sized cells, in response to changing climates in the region.
Alice E. Webb, Didier M. de Bakker, Karline Soetaert, Tamara da Costa, Steven M. A. C. van Heuven, Fleur C. van Duyl, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 6501–6516, https://doi.org/10.5194/bg-18-6501-2021, https://doi.org/10.5194/bg-18-6501-2021, 2021
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
Emmanuel Devred, Andrea Hilborn, and Cornelia Elizabeth den Heyer
Biogeosciences, 18, 6115–6132, https://doi.org/10.5194/bg-18-6115-2021, https://doi.org/10.5194/bg-18-6115-2021, 2021
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A theoretical model of grey seal seasonal abundance on Sable Island (SI) coupled with chlorophyll-a concentration [chl-a] measured by satellite revealed the impact of seal nitrogen fertilization on the surrounding waters of SI, Canada. The increase in seals from about 100 000 in 2003 to about 360 000 in 2018 during the breeding season is consistent with an increase in [chl-a] leeward of SI. The increase in seal abundance explains 8 % of the [chl-a] increase.
Julie Meilland, Michael Siccha, Maike Kaffenberger, Jelle Bijma, and Michal Kucera
Biogeosciences, 18, 5789–5809, https://doi.org/10.5194/bg-18-5789-2021, https://doi.org/10.5194/bg-18-5789-2021, 2021
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Planktonic foraminifera population dynamics has long been assumed to be controlled by synchronous reproduction and ontogenetic vertical migration (OVM). Due to contradictory observations, this concept became controversial. We here test it in the Atlantic ocean for four species of foraminifera representing the main clades. Our observations support the existence of synchronised reproduction and OVM but show that more than half of the population does not follow the canonical trajectory.
Federica Maggioni, Mireille Pujo-Pay, Jérome Aucan, Carlo Cerrano, Barbara Calcinai, Claude Payri, Francesca Benzoni, Yves Letourneur, and Riccardo Rodolfo-Metalpa
Biogeosciences, 18, 5117–5140, https://doi.org/10.5194/bg-18-5117-2021, https://doi.org/10.5194/bg-18-5117-2021, 2021
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Based on current experimental evidence, climate change will affect up to 90 % of coral reefs worldwide. The originality of this study arises from our recent discovery of an exceptional study site where environmental conditions (temperature, pH, and oxygen) are even worse than those forecasted for the future.
While these conditions are generally recognized as unfavorable for marine life, we found a rich and abundant coral reef thriving under such extreme environmental conditions.
Nisan Sariaslan and Martin R. Langer
Biogeosciences, 18, 4073–4090, https://doi.org/10.5194/bg-18-4073-2021, https://doi.org/10.5194/bg-18-4073-2021, 2021
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Analyses of foraminiferal assemblages from the Mamanguape mangrove estuary (northern Brazil) revealed highly diverse, species-rich, and structurally complex biotas. The atypical fauna resembles shallow-water offshore assemblages and are interpreted to be the result of highly saline ocean waters penetrating deep into the estuary. The findings contrast with previous studies, have implications for the fossil record, and provide novel perspectives for reconstructing mangrove environments.
Jutta E. Wollenburg, Jelle Bijma, Charlotte Cremer, Ulf Bickmeyer, and Zora Mila Colomba Zittier
Biogeosciences, 18, 3903–3915, https://doi.org/10.5194/bg-18-3903-2021, https://doi.org/10.5194/bg-18-3903-2021, 2021
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Cultured at in situ high-pressure conditions Cibicides and Cibicidoides taxa develop lasting ectoplasmic structures that cannot be retracted or resorbed. An ectoplasmic envelope surrounds their test and may protect the shell, e.g. versus carbonate aggressive bottom water conditions. Ectoplasmic roots likely anchor the specimens in areas of strong bottom water currents, trees enable them to elevate themselves above ground, and twigs stabilize and guide the retractable pseudopodial network.
Kumar Nimit
Biogeosciences, 18, 3631–3635, https://doi.org/10.5194/bg-18-3631-2021, https://doi.org/10.5194/bg-18-3631-2021, 2021
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The Indian Ocean Rim hosts many of the underdeveloped and emerging economies that depend on ocean resources for the livelihood of millions. Operational ocean information services cater to the requirements of resource managers and end-users to efficiently harness resources, mitigate threats and ensure safety. This paper outlines existing tools and explores the ongoing research that has the potential to convert the findings into operational services in the near- to midterm.
Finn Mielck, Rune Michaelis, H. Christian Hass, Sarah Hertel, Caroline Ganal, and Werner Armonies
Biogeosciences, 18, 3565–3577, https://doi.org/10.5194/bg-18-3565-2021, https://doi.org/10.5194/bg-18-3565-2021, 2021
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Marine sand mining is becoming more and more important to nourish fragile coastlines that face global change. We investigated the largest sand extraction site in the German Bight. The study reveals that after more than 35 years of mining, the excavation pits are still detectable on the seafloor while the sediment composition has largely changed. The organic communities living in and on the seafloor were strongly decimated, and no recovery is observable towards previous conditions.
France Van Wambeke, Elvira Pulido, Philippe Catala, Julie Dinasquet, Kahina Djaoudi, Anja Engel, Marc Garel, Sophie Guasco, Barbara Marie, Sandra Nunige, Vincent Taillandier, Birthe Zäncker, and Christian Tamburini
Biogeosciences, 18, 2301–2323, https://doi.org/10.5194/bg-18-2301-2021, https://doi.org/10.5194/bg-18-2301-2021, 2021
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Michaelis–Menten kinetics were determined for alkaline phosphatase, aminopeptidase and β-glucosidase in the Mediterranean Sea. Although the ectoenzymatic-hydrolysis contribution to heterotrophic prokaryotic needs was high in terms of N, it was low in terms of C. This study points out the biases in interpretation of the relative differences in activities among the three tested enzymes in regard to the choice of added concentrations of fluorogenic substrates.
Anna Escolano-Moltó, Susana Flecha, Raquel Vaquer-Sunyer, Marlene Wesselmann, Núria Marbà, and Iris Eline Hendriks
Biogeosciences Discuss., https://doi.org/10.5194/bg-2021-60, https://doi.org/10.5194/bg-2021-60, 2021
Revised manuscript accepted for BG
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Seagrasses are marine plants with the capacity to act as carbon sinks due to their high primary productivity, using carbon for growth. This capacity can play a key role in climate change mitigation. We compiled published and own data and show two Mediterranean seagrass species have different metabolic rates and the method used influences the rates of the measurements. Also the Eastern basin is more productive compared to the Western Mediterranean while most communities act as carbon sinks.
Oscar E. Romero, Simon Ramondenc, and Gerhard Fischer
Biogeosciences, 18, 1873–1891, https://doi.org/10.5194/bg-18-1873-2021, https://doi.org/10.5194/bg-18-1873-2021, 2021
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Upwelling intensity along NW Africa varies on the interannual to decadal timescale. Understanding its changes is key for the prediction of future changes of CO2 sequestration in the northeastern Atlantic. Based on a multiyear (1988–2009) sediment trap experiment at the site CBmeso, fluxes and the species composition of the diatom assemblage are presented. Our data help in establishing the scientific basis for forecasting and modeling future states of this ecosystem and its decadal changes.
Katharine T. Bigham, Ashley A. Rowden, Daniel Leduc, and David A. Bowden
Biogeosciences, 18, 1893–1908, https://doi.org/10.5194/bg-18-1893-2021, https://doi.org/10.5194/bg-18-1893-2021, 2021
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Turbidity flows – underwater avalanches – are large-scale physical disturbances believed to have profound impacts on productivity and diversity of benthic communities in the deep sea. We reviewed published studies and found that current evidence for changes in productivity is ambiguous at best, but the influence on regional and local diversity is clearer. We suggest study design criteria that may lead to a better understanding of large-scale disturbance effects on deep-sea benthos.
Phillip Williamson, Hans-Otto Pörtner, Steve Widdicombe, and Jean-Pierre Gattuso
Biogeosciences, 18, 1787–1792, https://doi.org/10.5194/bg-18-1787-2021, https://doi.org/10.5194/bg-18-1787-2021, 2021
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The reliability of ocean acidification research was challenged in early 2020 when a high-profile paper failed to corroborate previously observed impacts of high CO2 on the behaviour of coral reef fish. We now know the reason why: the
replicatedstudies differed in many ways. Open-minded and collaborative assessment of all research results, both negative and positive, remains the best way to develop process-based understanding of the impacts of ocean acidification on marine organisms.
Michael Lintner, Bianca Lintner, Wolfgang Wanek, Nina Keul, and Petra Heinz
Biogeosciences, 18, 1395–1406, https://doi.org/10.5194/bg-18-1395-2021, https://doi.org/10.5194/bg-18-1395-2021, 2021
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Foraminifera are unicellular marine organisms that play an important role in the marine element cycle. Changes of environmental parameters such as salinity or temperature have a significant impact on the faunal assemblages. Our experiments show that changes in salinity immediately influence the foraminiferal activity. Also the light regime has a significant impact on carbon or nitrogen processing in foraminifera which contain no kleptoplasts.
Michele Casini, Martin Hansson, Alessandro Orio, and Karin Limburg
Biogeosciences, 18, 1321–1331, https://doi.org/10.5194/bg-18-1321-2021, https://doi.org/10.5194/bg-18-1321-2021, 2021
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In the past 20 years the condition of the eastern Baltic cod has dropped, with large implications for the fishery. Our results show that simultaneously the cod population has moved deeper while low-oxygenated waters detrimental for cod growth have become shallower. Cod have thus dwelled more in detrimental waters, explaining the drop in its condition. This study, using long-term fish and hydrological monitoring data, evidences the impact of deoxygenation on fish biology and fishing.
Elizabeth D. LaBone, Kenneth A. Rose, Dubravko Justic, Haosheng Huang, and Lixia Wang
Biogeosciences, 18, 487–507, https://doi.org/10.5194/bg-18-487-2021, https://doi.org/10.5194/bg-18-487-2021, 2021
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The hypoxic zone is an area of low dissolved oxygen (DO) in the Gulf of Mexico. Fish can be killed by exposure to hypoxia and can be negatively impacted by exposure to low, nonlethal DO concentrations (sublethal DO). We found that high sublethal area resulted in higher exposure and DO variability had a small effect on exposure. There was a large variation in exposure among individuals, which when combined with spatial variability of DO, can result in an underestimation of exposure when averaged.
Svenja Reents, Peter Mueller, Hao Tang, Kai Jensen, and Stefanie Nolte
Biogeosciences, 18, 403–411, https://doi.org/10.5194/bg-18-403-2021, https://doi.org/10.5194/bg-18-403-2021, 2021
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By conducting a flooding experiment with two genotypes of the salt-marsh grass Elymus athericus, we show considerable differences in biomass response to flooding within the same species. As biomass production plays a major role in sedimentation processes and thereby salt-marsh accretion, we emphasise the importance of taking intraspecific differences into account when evaluating ecosystem resilience to accelerated sea level rise.
Cara Nissen and Meike Vogt
Biogeosciences, 18, 251–283, https://doi.org/10.5194/bg-18-251-2021, https://doi.org/10.5194/bg-18-251-2021, 2021
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Using a regional Southern Ocean ecosystem model, we find that the relative importance of Phaeocystis and diatoms at high latitudes is controlled by iron and temperature variability, with light levels controlling the seasonal succession in coastal areas. Yet, biomass losses via aggregation and grazing matter as well. We show that the seasonal succession of Phaeocystis and diatoms impacts the seasonality of carbon export fluxes with ramifications for nutrient cycling and food web dynamics.
Jiangtao Li, Lingyuan Gu, Shijie Bai, Jie Wang, Lei Su, Bingbing Wei, Li Zhang, and Jiasong Fang
Biogeosciences, 18, 113–133, https://doi.org/10.5194/bg-18-113-2021, https://doi.org/10.5194/bg-18-113-2021, 2021
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Few studies have focused on the particle-attached (PA) and free-living (FL) microbes of the deep ocean. Here we determined PA and FL microbial communities along depth profiles of the SCS. PA and FL fractions accommodated divergent microbial compositions, and most of them are potentially generalists with PA and FL dual lifestyles. A potential vertical connectivity between surface-specific microbes and those in the deep ocean was indicated, likely through microbial attachment to sinking particles.
Saskia Brix, Karen J. Osborn, Stefanie Kaiser, Sarit B. Truskey, Sarah M. Schnurr, Nils Brenke, Marina Malyutina, and Pedro Martinez Arbizu
Biogeosciences, 17, 6163–6184, https://doi.org/10.5194/bg-17-6163-2020, https://doi.org/10.5194/bg-17-6163-2020, 2020
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The Clarion–Clipperton Fracture Zone (CCZ) located in the Pacific is commercially the most important area of proposed manganese nodule mining. Extraction of this will influence the life and distribution of small deep-sea invertebrates like peracarid crustaceans, of which >90 % are undescribed species new to science. We are doing a species delimitation approach as baseline for an ecological interpretation of species distribution and discuss the results in light of future deep-sea conservation.
Amal Jayakumar and Bess B. Ward
Biogeosciences, 17, 5953–5966, https://doi.org/10.5194/bg-17-5953-2020, https://doi.org/10.5194/bg-17-5953-2020, 2020
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Diversity and community composition of nitrogen-fixing microbes in the three main oxygen minimum zones of the world ocean were investigated using nifH clone libraries. Representatives of three main clusters of nifH genes were detected. Sequences were most diverse in the surface waters. The most abundant OTUs were affiliated with Alpha- and Gammaproteobacteria. The sequences were biogeographically distinct and the dominance of a few OTUs was commonly observed in OMZs in this (and other) studies.
Guillermo Feliú, Marc Pagano, Pamela Hidalgo, and François Carlotti
Biogeosciences, 17, 5417–5441, https://doi.org/10.5194/bg-17-5417-2020, https://doi.org/10.5194/bg-17-5417-2020, 2020
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The impact of Saharan dust deposition events on the Mediterranean Sea ecosystem was studied during a basin-scale survey (PEACETIME cruise, May–June 2017). Short-term responses of the zooplankton community were observed after episodic dust deposition events, highlighting the impact of these events on productivity up to the zooplankton level in the poorly fertilized pelagic ecosystems of the southern Mediterranean Sea.
Douglas Lessa, Raphaël Morard, Lukas Jonkers, Igor M. Venancio, Runa Reuter, Adrian Baumeister, Ana Luiza Albuquerque, and Michal Kucera
Biogeosciences, 17, 4313–4342, https://doi.org/10.5194/bg-17-4313-2020, https://doi.org/10.5194/bg-17-4313-2020, 2020
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We observed that living planktonic foraminifera had distinct vertically distributed communities across the Subtropical South Atlantic. In addition, a hierarchic alternation of environmental parameters was measured to control the distribution of planktonic foraminifer's species depending on the water depth. This implies that not only temperature but also productivity and subsurface processes are signed in fossil assemblages, which could be used to perform paleoceanographic reconstructions.
Karl M. Attard and Ronnie N. Glud
Biogeosciences, 17, 4343–4353, https://doi.org/10.5194/bg-17-4343-2020, https://doi.org/10.5194/bg-17-4343-2020, 2020
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Light-use efficiency defines the ability of primary producers to convert sunlight energy to primary production. This report provides a framework to compute hourly and daily light-use efficiency using underwater eddy covariance, a recent technological development that produces habitat-scale rates of primary production for many different habitat types. The approach, tested on measured flux data, provides a useful means to compare habitat productivity across time and space.
Stacy Deppeler, Kai G. Schulz, Alyce Hancock, Penelope Pascoe, John McKinlay, and Andrew Davidson
Biogeosciences, 17, 4153–4171, https://doi.org/10.5194/bg-17-4153-2020, https://doi.org/10.5194/bg-17-4153-2020, 2020
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Our study showed how ocean acidification can exert both direct and indirect influences on the interactions among trophic levels within the microbial loop. Microbial grazer abundance was reduced at CO2 concentrations at and above 634 µatm, while microbial communities increased in abundance, likely due to a reduction in being grazed. Such changes in predator–prey interactions with ocean acidification could have significant effects on the food web and biogeochemistry in the Southern Ocean.
Mirjana Najdek, Marino Korlević, Paolo Paliaga, Marsej Markovski, Ingrid Ivančić, Ljiljana Iveša, Igor Felja, and Gerhard J. Herndl
Biogeosciences, 17, 3299–3315, https://doi.org/10.5194/bg-17-3299-2020, https://doi.org/10.5194/bg-17-3299-2020, 2020
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The response of Cymodocea nodosa to environmental changes was reported during a 15-month period. The meadow decline was triggered in spring by the simultaneous reduction of available light in the water column and the creation of anoxic conditions in the rooted area. This disturbance was critical for the plant since it took place during its recruitment phase when metabolic needs are maximal and stored reserves minimal. The loss of such habitat-forming seagrass is a major environmental concern.
Timm Schoening, Autun Purser, Daniel Langenkämper, Inken Suck, James Taylor, Daphne Cuvelier, Lidia Lins, Erik Simon-Lledó, Yann Marcon, Daniel O. B. Jones, Tim Nattkemper, Kevin Köser, Martin Zurowietz, Jens Greinert, and Jose Gomes-Pereira
Biogeosciences, 17, 3115–3133, https://doi.org/10.5194/bg-17-3115-2020, https://doi.org/10.5194/bg-17-3115-2020, 2020
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Seafloor imaging is widely used in marine science and industry to explore and monitor areas of interest. The selection of the most appropriate imaging gear and deployment strategy depends on the target application. This paper compares imaging platforms like autonomous vehicles or towed camera frames and different deployment strategies of those in assessing the megafauna abundance of polymetallic-nodule fields. The deep-sea mining industry needs that information for robust impact monitoring.
Tatsuro Tanioka and Katsumi Matsumoto
Biogeosciences, 17, 2939–2954, https://doi.org/10.5194/bg-17-2939-2020, https://doi.org/10.5194/bg-17-2939-2020, 2020
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We conducted an extensive literature survey (meta-analysis) on how the C : N : P ratio varies with change in key environmental drivers. We found that the expected reduction in nutrients and warming under the future climate change scenario is likely to result in increased C : P and C : N of marine phytoplankton. Further, our findings highlight the greater stoichiometric plasticity of eukaryotes over prokaryotes, which provide us insights on how to understand and model plankton.
Vanessa Joglar, Antero Prieto, Esther Barber-Lluch, Marta Hernández-Ruiz, Emilio Fernández, and Eva Teira
Biogeosciences, 17, 2807–2823, https://doi.org/10.5194/bg-17-2807-2020, https://doi.org/10.5194/bg-17-2807-2020, 2020
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Coastal marine ecosystems are among the most ecologically and economically productive areas providing a large fraction of ecosystem goods and services to human populations, and B vitamins have long been considered important growth factors for phytoplankton. Our findings indicate that the responses of microbial plankton to B-vitamin supply are mainly driven by the bacterial community composition and that microbial plankton in this area seems to be well adapted to cope with B-vitamin shortage.
Tasnim Patel, Henri Robert, Cedric D'Udekem D'Acoz, Koen Martens, Ilse De Mesel, Steven Degraer, and Isa Schön
Biogeosciences, 17, 2731–2744, https://doi.org/10.5194/bg-17-2731-2020, https://doi.org/10.5194/bg-17-2731-2020, 2020
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Exploitation of deep-sea resources in one of the largest ecosystems on the planet has rendered research of its biodiversity more urgent than ever before. We investigated the known habitats and connectivity of deep-sea scavenging amphipods and obtained important knowledge about several species. We also demonstrated that a long-term disturbance experiment has possibly reduced amphipod biodiversity. These data and further sampling expeditions are instrumental for formulating sustainable policies.
Daphne Cuvelier, Pedro A. Ribeiro, Sofia P. Ramalho, Daniel Kersken, Pedro Martinez Arbizu, and Ana Colaço
Biogeosciences, 17, 2657–2680, https://doi.org/10.5194/bg-17-2657-2020, https://doi.org/10.5194/bg-17-2657-2020, 2020
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Polymetallic nodule mining will remove hard substrata from the abyssal deep-sea floor. The only neighbouring ecosystems featuring hard substratum are seamounts, and their inhabiting fauna could aid in recovery post-mining. Nevertheless, first observations of seamount megafauna were very different from nodule-associated megafauna and showed little overlap. The possible uniqueness of these ecosystems implies that they should be included in management plans for the conservation of biodiversity.
Karen F. Wishner, Brad Seibel, and Dawn Outram
Biogeosciences, 17, 2315–2339, https://doi.org/10.5194/bg-17-2315-2020, https://doi.org/10.5194/bg-17-2315-2020, 2020
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Increasing deoxygenation and oxygen minimum zone expansion are consequences of global warming. Copepod species had different vertical distribution strategies and physiologies associated with oxygen profile variability (0–1000 m). Species (1) changed vertical distributions and maximum abundance depth, (2) shifted diapause depth, (3) changed diel vertical migration depths, or (4) changed epipelagic depth range in the aerobic mixed layer. Present-day variability helps predict future scenarios.
Magdalini Christodoulou, Timothy O'Hara, Andrew F. Hugall, Sahar Khodami, Clara F. Rodrigues, Ana Hilario, Annemiek Vink, and Pedro Martinez Arbizu
Biogeosciences, 17, 1845–1876, https://doi.org/10.5194/bg-17-1845-2020, https://doi.org/10.5194/bg-17-1845-2020, 2020
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Unexpectedly high diversity was revealed in areas licenced for polymetallic nodule mining exploration in the Pacific Ocean. For the first time, a comprehensive reference library including 287 novel ophiuroid sequences allocated to 43 species was produced. Differences in food availability along the nodule province of CCZ were reflected in the biodiversity patterns observed. The APEI3's dissimilarity with the exploration contract areas questions its ability to serve as a biodiversity reservoir.
Julie Meilland, Hélène Howa, Vivien Hulot, Isaline Demangel, Joëlle Salaün, and Thierry Garlan
Biogeosciences, 17, 1437–1450, https://doi.org/10.5194/bg-17-1437-2020, https://doi.org/10.5194/bg-17-1437-2020, 2020
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This study reports on planktonic foraminifera (PF) diversity and distribution in the Barents Sea. The species Globigerinita uvula and Turborotalita quinqueloba dominate the water column while surface sediments are dominated by Neogloboquadrina pachyderma. We hypothesize the unusual dominance of G. uvula in the water to be a seasonal signal or a result of climate forcing. Size-normalized-protein concentrations of PF show a northward decrease, suggesting biomass to vary with the environment.
Julien Richirt, Bettina Riedel, Aurélia Mouret, Magali Schweizer, Dewi Langlet, Dorina Seitaj, Filip J. R. Meysman, Caroline P. Slomp, and Frans J. Jorissen
Biogeosciences, 17, 1415–1435, https://doi.org/10.5194/bg-17-1415-2020, https://doi.org/10.5194/bg-17-1415-2020, 2020
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The paper presents the response of benthic foraminiferal communities to seasonal absence of oxygen coupled with the presence of hydrogen sulfide, considered very harmful for several living organisms.
Our results suggest that the foraminiferal community mainly responds as a function of the duration of the adverse conditions.
This knowledge is especially useful to better understand the ecology of benthic foraminifera but also in the context of palaeoceanographic interpretations.
Xiangqi Yi, Fei-Xue Fu, David A. Hutchins, and Kunshan Gao
Biogeosciences, 17, 1169–1180, https://doi.org/10.5194/bg-17-1169-2020, https://doi.org/10.5194/bg-17-1169-2020, 2020
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Combined effects of warming and light intensity were estimated in N2-fixing cyanobacterium Trichodesmium. Its physiological responses to warming were significantly modulated by light, with growth peaking at 27 °C under the light-saturating condition but being non-responsive across the range of 23–31 °C under the light-limiting condition. Light shortage also weakened the acclimation ability of Trichodesmium to warming, making light-limited Trichodesmium more sensitive to acute temperature change.
Jan Goleń, Jarosław Tyszka, Ulf Bickmeyer, and Jelle Bijma
Biogeosciences, 17, 995–1011, https://doi.org/10.5194/bg-17-995-2020, https://doi.org/10.5194/bg-17-995-2020, 2020
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We studied the organisation and dynamics of actin in foraminifera. Actin is one of the key structural proteins in most lifeforms. Our investigations show that in foraminifera it forms small granules, around 1 µm in diameter, that display rapid movement. This granularity is unusual in comparison to other organisms. We suppose that these granules are most likely involved in the formation of all types of pseudopods responsible for movement, food capturing, biomineralisation, and other functions.
Paulo Bonifácio, Pedro Martínez Arbizu, and Lénaïck Menot
Biogeosciences, 17, 865–886, https://doi.org/10.5194/bg-17-865-2020, https://doi.org/10.5194/bg-17-865-2020, 2020
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The patterns observed in the composition of polychaete assemblages were attributed to variations in food supply at the regional scale and nodule density at the local scale. The high levels of species replacement were mainly driven by rare species, leading to regional species pool estimates between 498 and 240 000 species. The high proportion of singletons seems reflect an under-sampling bias that is currently preventing the assessment of potential biodiversity loss due to nodule mining.
Stephanie Dutkiewicz, Pedro Cermeno, Oliver Jahn, Michael J. Follows, Anna E. Hickman, Darcy A. A. Taniguchi, and Ben A. Ward
Biogeosciences, 17, 609–634, https://doi.org/10.5194/bg-17-609-2020, https://doi.org/10.5194/bg-17-609-2020, 2020
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Phytoplankton are an essential component of the marine food web and earth's carbon cycle. We use observations, ecological theory and a unique trait-based ecosystem model to explain controls on patterns of marine phytoplankton biodiversity. We find that different dimensions of diversity (size classes, biogeochemical functional groups, thermal norms) are controlled by a disparate combination of mechanisms. This may explain why previous studies of phytoplankton diversity had conflicting results.
Emily White, Clara J. M. Hoppe, and Björn Rost
Biogeosciences, 17, 635–647, https://doi.org/10.5194/bg-17-635-2020, https://doi.org/10.5194/bg-17-635-2020, 2020
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The Arctic picoeukaryote Micromonas pusilla was acclimated to two pCO2 levels under a constant and a dynamic light, simulating more realistic light fields. M. pusilla was able to benefit from ocean acidification with an increase in growth rate, irrespective of the light regime. In dynamic light M. pusilla optimised its photophysiology for effective light usage during both low- and high-light periods. This highlights M. pusilla is likely to cope well with future conditions in the Arctic Ocean.
Oscar E. Romero, Karl-Heinz Baumann, Karin A. F. Zonneveld, Barbara Donner, Jens Hefter, Bambaye Hamady, Vera Pospelova, and Gerhard Fischer
Biogeosciences, 17, 187–214, https://doi.org/10.5194/bg-17-187-2020, https://doi.org/10.5194/bg-17-187-2020, 2020
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Monitoring of the multiannual evolution of populations representing different trophic levels allows for obtaining insights into the impact of climate variability in marine coastal upwelling ecosystems. By using a multiyear, continuous (1,900 d) sediment trap record, we assess the dynamics and fluxes of calcareous, organic and siliceous microorganisms off Mauritania (NW Africa). The experiment allowed for the recognition of a general sequence of seasonal variations of the main populations.
Ulrike Hanz, Claudia Wienberg, Dierk Hebbeln, Gerard Duineveld, Marc Lavaleye, Katriina Juva, Wolf-Christian Dullo, André Freiwald, Leonardo Tamborrino, Gert-Jan Reichart, Sascha Flögel, and Furu Mienis
Biogeosciences, 16, 4337–4356, https://doi.org/10.5194/bg-16-4337-2019, https://doi.org/10.5194/bg-16-4337-2019, 2019
Short summary
Short summary
Along the Namibian and Angolan margins, low oxygen conditions do not meet environmental ranges for cold–water corals and hence are expected to be unsuitable habitats. Environmental conditions show that tidal movements deliver water with more oxygen and high–quality organic matter, suggesting that corals compensate unfavorable conditions with availability of food. With the expected expansion of oxygen minimum zones in the future, this study provides an example how ecosystems cope with extremes.
Cited articles
Acker, J. G. and Leptoukh, G.: Online Analysis Enhances Use of NASA Earth
Science Data, EOS T. Am. Geophys. Un., 88, 14–17, 2007.
Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher, M.
Q., Anderson, B. E., and Burckle, L. H.: Wind-Driven Upwelling in the
Southern Ocean and the Deglacial Rise in Atmospheric CO2, Science, 323,
1443–1448, https://doi.org/10.1126/science.1167441, 2009.
Andersson, A. J. and Gledhill, D.: Ocean acidification and coral reefs:
effects on breakdown, dissolution, and net ecosystem calcification, Annu.
Rev. Mar. Sci., 5, 321–348, 2013.
Antonov, J. I., Locarnini, R. A., Boyer, T. P., Mishonov, A. V., and Garcia,
H. E.: World Ocean Atlas 2005, Volume 2: Salinity. S. Levitus, Ed. NOAA Atlas
NESDIS 62, U.S. Government Printing Office, Washington, D.C., 182 pp., 2006.
Archer, D. and Maier-Reimer, E.: Effect of deep-sea sedimentary calcite
preservation on atmospheric CO2 concentration, Nature, 367, 260–263,
1994.
Armstrong, R. A., Lee, C., Hedges, J. I., Honjo, S., and Wakeham, S. G.: A
new, mechanistic model for organic carbon fluxes in the ocean based on the
quantitative association of POC with ballast minerals, Deep-Sea Res. Pt. II,
49, 219–236, https://doi.org/10.1016/S0967-0645(01)00101-1, 2002.
Arrigo, K. R., Robinson, D. H., Worthen, D. L., Dunbar, R. B., DiTullio, G.
R., VanWoert, M., and Lizotte, M. P.: Phytoplankton Community Structure and
the Drawdown of Nutrients and CO2 in the Southern Ocean, Science, 283,
365–367, https://doi.org/10.1126/science.283.5400.365, 1999.
Arrigo, K. R., DiTullio, G. R., Dunbar, R. B., Robinson, D. H., VanWoert, M.,
Worthen, D. L., and Lizotte, M. P.: Phytoplankton taxonomic variability in
nutrient utilization and primary production in the Ross Sea, J. Geophys.
Res.-Oceans, 105, 8827–8846, https://doi.org/10.1029/1998JC000289, 2000.
Bach, L. T., Riebesell, U., Gutowska, M. A., Federwisch, L., and Schulz, K.
G.: A unifying concept of coccolithophore sensitivity to changing carbonate
chemistry embedded in an ecological framework, Prog. Oceanogr., 135,
125–138, https://doi.org/10.1016/j.pocean.2015.04.012, 2015.
Balch, W. M.: Re-evaluation of the physiological ecology of coccolithophores,
in: Coccolithophores. From Molecular Processes to Global Impact, edited by:
Thierstein, H. R. and Young, J. R., Springer-Verlag, Berlin, 165–190, 2004.
Balch, W. M., Drapeau, D. T., Bowler, B. C., Lyczskowski, E., Booth, E. S.,
and Alley, D.: The contribution of coccolithophores to the optical and
inorganic carbon budgets during the Southern Ocean Gas Exchange Experiment:
New evidence in support of the “Great Calcite Belt” hypothesis, J. Geophys.
Res.-Oceans, 116, C00F06, https://doi.org/10.1029/2011JC006941, 2011.
Balch, W. M., Bates, N. R., Lam, P. J., Twining, B. S., Rosengard, S. Z.,
Bowler, B. C., Drapeau, D. T., Garley, R., Lubelczyk, L. C., Mitchell, C.,
and Rauschenberg, S.: Factors regulating the Great Calcite Belt in the
Southern Ocean and its biogeochemical significance, Global Biogeochem. Cy.,
30, 1124–1144, https://doi.org/10.1002/2016GB005414, 2016.
Barber, R. T. and Hiscock, M. R.: A rising tide lifts all phytoplankton:
Growth response of other phytoplankton taxa in diatom-dominated blooms,
Global Biogeochem. Cy., 20, GB4S03, https://doi.org/10.1029/2006GB002726, 2006.
Barnett, T. P., Pierce, D. W., AchutaRao, K. M., Gleckler, P. J., Santer, B.
D., Gregory, J. M., and Washington, W. M.: Penetration of Human-Induced
Warming into the World's Oceans, Science, 309, 284–287,
https://doi.org/10.1126/science.1112418, 2005.
Beaufort, L.: Weight estimates of coccoliths using the optical properties
(birefringence) of calcite, Micropaleontology, 51, 289–297,
https://doi.org/10.2113/gsmicropal.51.4.289, 2005.
Beaufort, L., Couapel, M., Buchet, N., Claustre, H., and Goyet, C.: Calcite
production by coccolithophores in the south east Pacific Ocean,
Biogeosciences, 5, 1101–1117, https://doi.org/10.5194/bg-5-1101-2008, 2008.
Beaufort, L., Probert, I., de Garidel-Thoron, T., Bendif, E. M., Ruiz-Pino,
D., Metzl, N., Goyet, C., Buchet, N., Coupel, P., Grelaud, M., Rost, B.,
Rickaby, R. E. M., and de Vargas, C.: Sensitivity of coccolithophores to
carbonate chemistry and ocean acidification, Nature, 476, 80–83, 2011.
Bollmann, J. and Herrle, J. O.: Morphological variation of Emiliania huxleyi
and sea surface salinity, Earth Planet. Sc. Lett., 255, 273–288,
https://doi.org/10.1016/j.epsl.2006.12.029, 2007.
Bopp, L., Monfray, P., Aumont, O., Dufresne, J.-L., Le Treut, H., Madec, G.,
Terray, L., and Orr, J. C.: Potential impact of climate change on marine
export production, Global Biogeochem. Cy., 15, 81–99,
https://doi.org/10.1029/1999GB001256, 2001.
Bostock, H. C., Hayward, B. W., Neil, H. L., Currie, K. I., and Dunbar, G.
B.: Deep-water carbonate concentrations in the southwest Pacific, Deep-Sea
Res. Pt. I, 58, 72–85, https://doi.org/10.1016/j.dsr.2010.11.010, 2011.
Boyd, P. and Newton, P.: Evidence of the potential influence of planktonic
community structure on the interannual variability of particulate organic
carbon flux, Deep-Sea Res. Pt. I, 42, 619–639,
https://doi.org/10.1016/0967-0637(95)00017-Z, 1995.
Boyd, P. W. and Trull, T. W.: Understanding the export of biogenic particles
in oceanic waters: Is there consensus?, Prog. Oceanogr., 72, 276–312,
https://doi.org/10.1016/j.pocean.2006.10.007, 2007.
Boyd, P. W., LaRoche, J., Gall, M. P., Frew, R., and McKay, R. M. L.: Role of
iron, light, and silicate in controlling algal biomass in subantarctic waters
SE of New Zealand, J. Geophys. Res.-Oceans, 104, 13395–13408,
https://doi.org/10.1029/1999JC900009, 1999.
Boyd, P., Watson, A., Law, C., Abraham, E., Trull, T., Murdoch, R., Bakker,
D., Bowie, A., Buesseler, K., and Chang, H.: Phytoplankton bloom upon
mesoscale iron fertilisation of polar Southern Ocean waters, Nature, 407,
695–702, 2000a.
Boyd, P. W., Watson, A. J., Law, C. S., Abraham, E. R., Trull, T., Murdoch,
R., Bakker, D. C. E., Bowie, A. R., Buesseler, K. O., Chang, H., Charette,
M., Croot, P., Downing, K., Frew, R., Gall, M., Hadfield, M., Hall, J.,
Harvey, M., Jameson, G., LaRoche, J., Liddicoat, M., Ling, R., Maldonado, M.
T., McKay, R. M., Nodder, S., Pickmere, S., Pridmore, R., Rintoul, S., Safi,
K., Sutton, P., Strzepek, R., Tanneberger, K., Turner, S., Waite, A., and
Zeldis, J.: A mesoscale phytoplankton bloom in the polar Southern Ocean
stimulated by iron fertilization, Nature, 407, 695–702, 2000b.
Boyd, P. W., Strzepek, R., Fu, F., and Hutchins, D. A.: Environmental control
of open-ocean phytoplankton groups: Now and in the future, Limnol. Oceanogr.,
55, 1353–1376, https://doi.org/10.4319/lo.2010.55.3.1353, 2010.
Brand, L. E., Sunda, W. G., and Guillard, R. R. L.: Limitation of marine
phytoplankton reproductive rates by zinc, manganese, and iron 1, Limnol.
Oceanogr., 28, 1182–1198, https://doi.org/10.4319/lo.1983.28.6.1182, 1983.
Brzezinski, M. A., Nelson, D. M., Franck, V. M., and Sigmon, D. E.: Silicon
dynamics within an intense open-ocean diatom bloom in the Pacific sector of
the Southern Ocean, Deep-Sea Res. Pt. II, 48, 3997–4018,
https://doi.org/10.1016/S0967-0645(01)00078-9, 2001.
Buesseler, K. O., Antia, A. N., Chen, M., Fowler, S. W., Gardner, W. D.,
Gustafsson, O., Harada, K., Michaels, A. F., der Loeff, M. R. v., and Sarin,
M.: An assessment of the use of sediment traps for estimating upper ocean
particle fuxes, J. Marine Res., 65, 345–416, 2007.
CARINA group: Temperature, salinity,
nutrients, carbon, and other profile data collected worldwide as part of the
CARINA project (NODC Accession 0057766), Version 2.2.,
https://doi.org/10.3334/CDIAC/OTG.NDP091, 2011.
Cermeño, P., Dutkiewicz, S., Harris, R. P., Follows, M., Schofield, O.,
and Falkowski, P. G.: The role of nutricline depth in regulating the ocean
carbon cycle, P. Natl. Acad. Sci. USA, 105, 20344–20349,
https://doi.org/10.1073/pnas.0811302106, 2008.
Closset, I., Cardinal, D., Bray, S. G., Thil, F., Djouraev, I.,
Rigual-Hernández, A. S., and Trull, T. W.: Seasonal variations, origin,
and fate of settling diatoms in the Southern Ocean tracked by silicon isotope
records in deep sediment traps, Global Biogeochem. Cy., 29, 1495–1510,
https://doi.org/10.1002/2015GB005180, 2015.
Cook, S. S., Whittock, L., Wright, S. W., and Hallegraeff, G. M.:
Photosynthetic pigment and genetic differences between two southern ocean
morphotypes of Emiliania huxleyi (haptophyta), J. Phycol., 47,
615–626, 2011.
Cook, S. S., Jones, R. C., Vaillancourt, R. E., and Hallegraeff, G. M.:
Genetic differentiation among Australian and Southern Ocean populations of
the ubiquitous coccolithophore Emiliania huxleyi (Haptophyta),
Phycologia, 52, 368–374, https://doi.org/10.2216/12-111.1, 2013.
Cubillos, J., Wright, S., Nash, G., De Salas, M., Griffiths, B., Tilbrook,
B., Poisson, A., and Hallegraeff, G.: Calcification morphotypes of the
coccolithophorid Emiliania huxleyi in the Southern Ocean: changes in
2001 to 2006 compared to historical data, Mar. Ecol.-Prog. Ser., 348, 47–54,
2007.
Deppeler, S. L. and Davidson, A. T.: Southern Ocean Phytoplankton in a
Changing Climate, Front. Mar. Sci., 4, https://doi.org/10.3389/fmars.2017.00040,
2017.
Ebersbach, F., Trull, T. W., Davies, D. M., and Bray, S. G.: Controls on
mesopelagic particle fluxes in the Sub-Antarctic and Polar Frontal Zones in
the Southern Ocean south of Australia in summer – Perspectives from
free-drifting sediment traps, Deep-Sea Res. Pt. II, 58, 2260–2276,
https://doi.org/10.1016/j.dsr2.2011.05.025, 2011.
Falkowski, P. G., Katz, M. E., Knoll, A. H., Quigg, A., Raven, J. A.,
Schofield, O., and Taylor, F. J. R.: The Evolution of Modern Eukaryotic
Phytoplankton, Science, 305, 354–360, https://doi.org/10.1126/science.1095964, 2004.
Feely, R. A., Doney, S. C., and Cooley, S. R.: Ocean acidification: present
conditions and future changes in a high-CO2 world, Oceanography, 22, 36–47, 2009.
Feng, Y., Roleda, M. Y., Armstrong, E., Boyd, P. W., and Hurd, C. L.:
Environmental controls on the growth, photosynthetic and calcification rates
of a Southern Hemisphere strain of the coccolithophore Emiliania huxleyi, Limnol. Oceanogr., 62, 519–540, https://doi.org/10.1002/lno.10442, 2017.
Fetterer, F., Knowles, K., Meier, W., Savoie, M., and Windnagel, A. K.: Sea
Ice Index, Version 3 [Sea Ice Extent], https://doi.org/10.7265/N5K072F8, 2017.
Flores, J. A. and Sierro, F. J.: A revised technique for the calculation of
calcareous nannofossil accumulation rates, Micropaleontology, 43, 321–324,
1997.
Freeman, N. M. and Lovenduski, N. S.: Decreased calcification in the Southern
Ocean over the satellite record, Geophys. Res. Lett., 42, 1834–1840,
https://doi.org/10.1002/2014GL062769, 2015.
Frölicher, T. L., Sarmiento, J. L., Paynter, D. J., Dunne, J. P.,
Krasting, J. P., and Winton, M.: Dominance of the Southern Ocean in
Anthropogenic Carbon and Heat Uptake in CMIP5 Models, J. Climate, 28,
862–886, https://doi.org/10.1175/jcli-d-14-00117.1, 2015.
Fuertes, M.-Á., Flores, J.-A., and Sierro, F. J.: The use of circularly
polarized light for biometry, identification and estimation of mass of
coccoliths, Mar. Micropaleontol., 113, 44–55,
https://doi.org/10.1016/j.marmicro.2014.08.007, 2014.
Gafar, N. A., Eyre, B. D., and Schulz, K. G.: A Conceptual Model for
Projecting Coccolithophorid Growth, Calcification and Photosynthetic Carbon
Fixation Rates in Response to Global Ocean Change, Front. Mar. Sci., 4,
https://doi.org/10.3389/fmars.2017.00433, 2018.
Gal, A., Wirth, R., Kopka, J., Fratzl, P., Faivre, D., and Scheffel, A.:
Macromolecular recognition directs calcium ions to coccolith mineralization
sites, Science, 353, 590–593, https://doi.org/10.1126/science.aaf7889, 2016.
Giraudeau, J. and Beaufort, L.: Coccolithophores: from extant populations to
fossil assemblages, Proxies in Late Cenozoic paleoceanography–Developments
in Marine Geology, edited by: Hillaire-Marcel, C. and De Vernal, A.,
Elsevier, 409–439, 2007.
Gladstone, R. M., Bigg, G. R., and Nicholls, K. W.: Iceberg trajectory
modeling and meltwater injection in the Southern Ocean, J. Geophys.
Res.-Oceans, 106, 19903–19915, https://doi.org/10.1029/2000JC000347, 2001.
Hagino, K., Bendif, E. M., Young, J. R., Kogame, K., Probert, I., Takano, Y.,
Horiguchi, T., de Vargas, C., and Okada, H.: New evidence for morphological
and genetic variation in the cosmopolitan coccolithophore Emiliania huxleyi (prymnesiophyceae) from the COX1b-ATP4 genes1, J. Phycol., 47,
1164–1176, https://doi.org/10.1111/j.1529-8817.2011.01053.x, 2011.
Hall, J. A. and Safi, K.: The impact of in situ Fe fertilisation on the
microbial food web in the Southern Ocean, Deep-Sea Res. Pt. II, 48,
2591–2613, https://doi.org/10.1016/S0967-0645(01)00010-8, 2001.
Henderiks, J., Winter, A., Elbrächter, M., Feistel, R., van der Plas, A.,
Nausch, G., and Barlow, R.: Environmental controls on Emiliania huxleyi morphotypes in the Benguela coastal upwelling system (SE Atlantic),
Mar. Ecol.-Prog. Ser., 448, 51–66, 2012.
Holligan, P. M., Viollier, M., Harbour, D. S., Camus, P., and
Champagne-Philippe, M.: Satellite and ship studies of coccolithophore
production along a continental shelf edge, Nature, 304, 339–342, 1983.
Holligan, P. M., Charalampopoulou, A., and Hutson, R.: Seasonal distributions
of the coccolithophore, Emiliania huxleyi, and of particulate
inorganic carbon in surface waters of the Scotia Sea, J. Marine Syst., 82,
195–205, https://doi.org/10.1016/j.jmarsys.2010.05.007, 2010.
Honjo, S. and Doherty, K. W.: Large aperture time-series sediment traps;
design objectives, construction and application, Deep-Sea Res. Pt. A, 35,
133–149, 1988.
Hopkins, J., Henson, S. A., Painter, S. C., Tyrrell, T., and Poulton, A. J.:
Phenological characteristics of global coccolithophore blooms, Global
Biogeochem. Cy., 29, 239–253, https://doi.org/10.1002/2014GB004919, 2015.
Kemp, A. E. S., Pike, J., Pearce, R. B., and Lange, C. B.: The “Fall dump”
– a new perspective on the role of a “shade flora” in the annual cycle of
diatom production and export flux, Deep-Sea Res. Pt. II, 47, 2129–2154,
2000.
Khatiwala, S., Primeau, F., and Hall, T.: Reconstruction of the history of
anthropogenic CO2 concentrations in the ocean, 462, 346–349, https://doi.org/10.1038/nature08526, 2009.
Klaas, C. and Archer, D. E.: Association of sinking organic matter with
various types of mineral ballast in the deep sea: Implications for the rain
ratio, Global Biogeochem. Cy., 16, 63-1–63-14, https://doi.org/10.1029/2001GB001765,
2002.
Knappertsbusch, M., Cortes, M. Y., and Thierstein, H. R.: Morphologic
variability of the coccolithophorid Calcidiscus leptoporus in the
plankton, surface sediments and from the Early Pleistocene, Marine
Micropaleontology, 30, 293–317, https://doi.org/10.1016/S0377-8398(96)00053-9, 1997.
Langer, G. and Benner, I.: Effect of elevated nitrate concentration on
calcification in Emiliania huxleyi, Journal of Nannoplankton Research, 30,
77–80, 2009.
Lee, R. B. Y., Mavridou, D. A. I., Papadakos, G., McClelland, H. L. O., and
Rickaby, R. E. M.: The uronic acid content of coccolith-associated
polysaccharides provides insight into coccolithogenesis and past climate,
Nat. Commun., 7, 13144, https://doi.org/10.1038/ncomms13144, 2016.
Levitus, S., Antonov, J. I., Boyer, T. P., and Stephens, C.: Warming of the
World Ocean, Science, 287, 2225–2229, https://doi.org/10.1126/science.287.5461.2225,
2000.
Litchman, E., Edwards, K. F., Klausmeier, C. A., and Thomas, M. K.:
Phytoplankton niches, traits and eco-evolutionary responses to global
environmental change, Mar. Ecol.-Prog. Ser., 470, 235–248, 2012.
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H.
E., Baranova, O. K., Zweng, M. M., and Johnson, D. R.: World Ocean Atlas
2009, Volume 1: Temperature, NOAA Atlas NESDIS 68, edited by: Levitus, S.,
U.S. Government Printing Office, Washington, D.C., 2010.
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H. E.,
Baranova, O. K., Zweng, M. M., Paver, C. R., Reagan, J. R., Johnson, D. R., Hamilton, M., and Seidov, D.:
World Ocean Atlas 2013, Volume 1: Temperature, S. Levitus, edited by: Mishonov,
A., NOAA Atlas NESDIS 73, 40 pp.,
2013.
Lochte, K., Ducklow, H. W., Fasham, M. J. R., and Stienen, C.: Plankton
succession and carbon cycling at 47∘ N 20∘ W during the
JGOFS North Atlantic Bloom Experiment, Deep-Sea Res. Pt. II, 40, 91–114,
https://doi.org/10.1016/0967-0645(93)90008-B, 1993.
Lombard, F., da Rocha, R. E., Bijma, J., and Gattuso, J.-P.: Effect of
carbonate ion concentration and irradiance on calcification in planktonic
foraminifera, Biogeosciences, 7, 247–255,
https://doi.org/10.5194/bg-7-247-2010, 2010.
Malinverno, E., Triantaphyllou, M. V., and Dimiza, M. D.: Coccolithophore
assemblage distribution along a temperate to polar gradient in theWest
Pacific sector of the Southern Ocean (January 2005), Micropaleontology, 61,
489–506, 2015.
Margalef, R.: Life-forms of phytoplankton as survival alternatives in an
unstable environment, Oceanol. Acta, 1, 493–509, 1978.
Massom, R., Reid, P., Stammerjohn, S., Raymond, B., Fraser, A., and Ushio,
S.: Change and Variability in East Antarctic Sea Ice Seasonality,
1979/80–2009/10, PLOS ONE, 8, e64756, https://doi.org/10.1371/journal.pone.0064756,
2013.
McNeil, B. I. and Matear, R. J.: Southern Ocean acidification: A tipping
point at 450-ppm atmospheric CO2, P. Natl. Acad. Sci., 105, 18860–18864,
2008.
Meier, K. J. S., Beaufort, L., Heussner, S., and Ziveri, P.: The role of
ocean acidification in Emiliania huxleyi coccolith thinning in the
Mediterranean Sea, Biogeosciences, 11, 2857–2869,
https://doi.org/10.5194/bg-11-2857-2014, 2014.
Merico, A., Tyrrell, T., Lessard, E. J., Oguz, T., Stabeno, P. J., Zeeman, S.
I., and Whitledge, T. E.: Modelling phytoplankton succession on the Bering
Sea shelf: role of climate influences and trophic interactions in
generating Emiliania huxleyi blooms 1997–2000, Deep-Sea Res. Pt. I,
51, 1803–1826, https://doi.org/10.1016/j.dsr.2004.07.003, 2004.
Milliman, J. D., Troy, P. J., Balch, W. M., Adams, A. K., Li, Y. H., and
Mackenzie, F. T.: Biologically mediated dissolution of calcium carbonate
above the chemical lysocline?, Deep-Sea Res. Pt. I, 46, 1653–1669,
https://doi.org/10.1016/S0967-0637(99)00034-5, 1999.
Moy, A. D., Howard, W. R., Bray, S. G., and Trull, T. W.: Reduced
calcification in modern Southern Ocean planktonic foraminifera, Nat. Geosci.,
2, 276–280, 2009.
Muggli, D. L. and Harrison, P. J.: Effects of iron on two oceanic
phytoplankters grown in natural NE subarctic pacific seawater with no
artificial chelators present, J. Exp. Mar. Biol. Ecol., 212, 225–237,
https://doi.org/10.1016/S0022-0981(96)02752-9, 1997.
Orr, J. C., Fabry, V. J., Aumont, O., Bopp, L., Doney, S. C., Feely, R. A.,
Gnanadesikan, A., Gruber, N., Ishida, A., and Joos, F.: Anthropogenic ocean
acidification over the twenty-first century and its impact on calcifying
organisms, Nature, 437, 681–686, 2005.
Orsi, A. H., Whitworth Iii, T., and Nowlin Jr., W. D.: On the meridional
extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Res. Pt. I,
42, 641–673, https://doi.org/10.1016/0967-0637(95)00021-W, 1995.
Paasche, E.: Reduced coccolith calcite production under light-limited growth:
a comparative study of three clones of Emiliania huxleyi
(Prymnesiophyceae), Phycologia, 38, 508–516,
https://doi.org/10.2216/i0031-8884-38-6-508.1, 1999.
Paasche, E.: A review of the coccolithophorid Emiliania huxleyi
(Prymnesiophyceae), with particular reference to growth, coccolith formation,
and calcification-photosynthesis interactions, Phycologia, 40, 503–529,
https://doi.org/10.2216/i0031-8884-40-6-503.1, 2002.
Paasche, E. and Brubak, S.: Enhanced calcification in the coccolithophorid
Emiliania huxleyi (Haptophyceae) under phosphorus limitation, Phycologia, 33,
324–330, https://doi.org/10.2216/i0031-8884-33-5-324.1, 1994.
Pardo, P. C., Tilbrook, B., Langlais, C., Trull, T. W., and Rintoul, S. R.:
Carbon uptake and biogeochemical change in the Southern Ocean, south of
Tasmania, Biogeosciences, 14, 5217–5237,
https://doi.org/10.5194/bg-14-5217-2017, 2017.
Parslow, J. S., Boyd, P. W., Rintoul, S. R., and Griffiths, F. B.: A
persistent subsurface chlorophyll maximum in the Interpolar Frontal Zone
south of Australia: Seasonal progression and implications for
phytoplankton-light-nutrient interactions, J. Geophys. Res.-Oceans, 106,
31543–31557, https://doi.org/10.1029/2000JC000322, 2001.
Passow, U. and De La Rocha, C. L.: Accumulation of mineral ballast on organic
aggregates, Global Biogeochem. Cy., 20, GB1013, https://doi.org/10.1029/2005GB002579,
2006.
Patil, S. M., Mohan, R., Shetye, S. S., Gazi, S., Baumann, K.-H., and Jafar,
S.: Biogeographic distribution of extant Coccolithophores in the Indian
sector of the Southern Ocean, Mar. Micropaleontol., 137, 16–30,
https://doi.org/10.1016/j.marmicro.2017.08.002, 2017.
Poulton, A. J., Young, J. R., Bates, N. R., and Balch, W. M.: Biometry of
detached Emiliania huxleyi coccoliths along the Patagonian Shelf,
Mar. Ecol.-Prog. Ser., 443, 1–17, 2011.
Quéguiner, B.: Iron fertilization and the structure of planktonic
communities in high nutrient regions of the Southern Ocean, Deep-Sea Res. Pt.
II, 90, 43–54, https://doi.org/10.1016/j.dsr2.2012.07.024, 2013.
Rembauville, M., Meilland, J., Ziveri, P., Schiebel, R., Blain, S., and
Salter, I.: Planktic foraminifer and coccolith contribution to carbonate
export fluxes over the central Kerguelen Plateau, Deep-Sea Res. Pt. I, 111,
91–101, https://doi.org/10.1016/j.dsr.2016.02.017, 2016.
Reynolds, R. W., Rayner, N. A., Smith, T. M., Stokes, D. C., and Wang, W.: An
Improved In Situ and Satellite SST Analysis for Climate, J. Climate, 15,
1609–1625, https://doi.org/10.1175/1520-0442(2002)015<1609:aiisas>2.0.co;2, 2002.
Ridgwell, A. and Zeebe, R. E.: The role of the global carbonate cycle in the
regulation and evolution of the Earth system, Earth Planet. Sc. Lett., 234,
299–315, https://doi.org/10.1016/j.epsl.2005.03.006, 2005.
Rigual-Hernandez, A. S. and Trull, T. W.: Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone, Australian Antarctic Data
Centre,
https://doi.org/10.4225/15/5ab86f35e277e, 2018.
Rigual-Hernández, A. S., Trull, T. W., Bray, S. G., Closset, I., and
Armand, L. K.: Seasonal dynamics in diatom and particulate export fluxes to
the deep sea in the Australian sector of the southern Antarctic Zone, J.
Marine Syst., 142, 62–74, https://doi.org/10.1016/j.jmarsys.2014.10.002, 2015a.
Rigual-Hernández, A. S., Trull, T. W., Bray, S. G., Cortina, A., and
Armand, L. K.: Latitudinal and temporal distributions of diatom populations
in the pelagic waters of the Subantarctic and Polar Frontal zones of the
Southern Ocean and their role in the biological pump, Biogeosciences, 12,
5309–5337, https://doi.org/10.5194/bg-12-5309-2015, 2015b.
Rost, B. and Riebesell, U.: Coccolithophores and the biological pump:
responses to environmental changes, in: Coccolithophores: From Molecular
Processes to Global Impact, edited by: Thierstein, H. R. and Young, J. R.,
Springer Berlin Heidelberg, Berlin, Heidelberg, 99–125, 2004.
Saavedra-Pellitero, M., Baumann, K.-H., Flores, J.-A., and Gersonde, R.:
Biogeographic distribution of living coccolithophores in the Pacific sector
of the Southern Ocean, Mar. Micropaleontol., 109, 1–20, 2014.
Salter, I., Schiebel, R., Ziveri, P., Movellan, A., Lampitt, R., and Wolff,
G. A.: Carbonate counter pump stimulated by natural iron fertilization in the
Polar Frontal Zone, Nat. Geosci., 7, 885–889, https://doi.org/10.1038/ngeo2285, 2014.
Sarmiento, J. L., Gruber, N., Brzezinski, M. A., and Dunne, J. P.:
High-latitude controls of thermocline nutrients and low latitude biological
productivity, Nature, 427, 56–60, 2004a.
Sarmiento, J. L., Slater, R., Barber, R., Bopp, L., Doney, S. C., Hirst, A.
C., Kleypas, J., Matear, R., Mikolajewicz, U., Monfray, P., Soldatov, V.,
Spall, S. A., and Stouffer, R.: Response of ocean ecosystems to climate
warming, Global Biogeochem. Cy., 18, GB3003, https://doi.org/10.1029/2003GB002134, 2004b.
Saruwatari, K., Satoh, M., Harada, N., Suzuki, I., and Shiraiwa, Y.: Change
in coccolith size and morphology due to response to temperature and salinity
in coccolithophore Emiliania huxleyi (Haptophyta) isolated from the Bering
and Chukchi seas, Biogeosciences, 13, 2743–2755,
https://doi.org/10.5194/bg-13-2743-2016, 2016.
Schulz, K., Zondervan, I., Gerringa, L., Timmermans, K., Veldhuis, M., and
Riebesell, U.: Effect of trace metal availability on coccolithophorid
calcification, Nature, 430, 673–676, 2004.
Shadwick, E. H., Trull, T., Thomas, H., and Gibson, J. A. E.: Vulnerability of
Polar Oceans to Anthropogenic Acidification: Comparison of Arctic and Antarctic Seasonal Cycles, Scientific
Reports,
3, 1–7, 2013.
Shadwick, E. H., Tilbook, B., Cassar, N., Trull, T. W., and Rintoul, S. R.: Summertime physical and biological controls on O2 and CO2 in the Australian Sector of the Southern Ocean, J. Marine
Syst.,
147, 21–28, 2015a.
Shadwick, E. H., Trull, T. W., Tilbrook, B., Sutton, A. J., Schulz, E., and Sabine, C. L.:
Seasonality of biological and physical controls on surface ocean CO2 from hourly
observations at the Southern Ocean Time Series site south of Australia,
Global Biogeochem. Cy., 29, 223–238, https://doi.org/10.1002/2014GB004906, 2015b.
Siegel, D. A. and Deuser, W. G.: Trajectories of sinking particles in the
Sargasso Sea: modeling of statistical funnels above deep-ocean sediment
traps, Deep-Sea Res. Pt. I, 44, 1519–1541,
https://doi.org/10.1016/S0967-0637(97)00028-9, 1997.
Siegel, D. A., Fields, E., and Buesseler, K. O.: A bottom-up view of the
biological pump: Modeling source funnels above ocean sediment traps, Deep-Sea
Res. Pt. I, 55, 108–127, https://doi.org/10.1016/j.dsr.2007.10.006, 2008.
Sieracki, M. E., Verity, P. G., and Stoecker, D. K.: Plankton community
response to sequential silicate and nitrate depletion during the 1989 North
Atlantic spring bloom, Deep-Sea Res. Pt. II, 40, 213–225,
https://doi.org/10.1016/0967-0645(93)90014-E, 1993.
Sigman, D. M. and Boyle, E. A.: Glacial/interglacial variations in
atmospheric carbon dioxide, Nature, 407, 859–869, 2000.
Smith, H. E. K., Tyrrell, T., Charalampopoulou, A., Dumousseaud, C., Legge,
O. J., Birchenough, S., Pettit, L. R., Garley, R., Hartman, S. E., Hartman,
M. C., Sagoo, N., Daniels, C. J., Achterberg, E. P., and Hydes, D. J.:
Predominance of heavily calcified coccolithophores at low CaCO3 saturation
during winter in the Bay of Biscay, P. Natl. Acad. Sci. USA, 109, 8845–8849,
https://doi.org/10.1073/pnas.1117508109, 2012.
Sohrin, Y., Iwamoto, S., Matsui, M., Obata, H., Nakayama, E., Suzuki, K.,
Handa, N., and Ishii, M.: The distribution of Fe in the Australian sector of
the Southern Ocean, Deep-Sea Res. Pt. I, 47, 55–84,
https://doi.org/10.1016/S0967-0637(99)00049-7, 2000.
Tagliabue, A., Sallee, J.-B., Bowie, A. R., Levy, M., Swart, S., and Boyd, P.
W.: Surface-water iron supplies in the Southern Ocean sustained by deep
winter mixing, Nat. Geosci., 7, 314–320, https://doi.org/10.1038/ngeo2101, 2014.
Takahashi, T., Sutherland, S. C., Wanninkhof, R., Sweeney, C., Feely, R. A.,
Chipman, D. W., Hales, B., Friederich, G., Chavez, F., Sabine, C., Watson,
A., Bakker, D. C. E., Schuster, U., Metzl, N., Yoshikawa-Inoue, H., Ishii,
M., Midorikawa, T., Nojiri, Y., Körtzinger, A., Steinhoff, T., Hoppema,
M., Olafsson, J., Arnarson, T. S., Tilbrook, B., Johannessen, T., Olsen, A.,
Bellerby, R., Wong, C. S., Delille, B., Bates, N. R., and de Baar, H. J. W.:
Climatological mean and decadal change in surface ocean pCO2, and net
sea–air CO2 flux over the global oceans, Deep-Sea Res. Pt. II, 56,
554–577, https://doi.org/10.1016/j.dsr2.2008.12.009, 2009.
Thunell, R., Pride, C., Ziveri, P., Muller-Karger, F., Sancetta, C., and
Murray, D.: Plankton response to physical forcing in the Gulf of California,
J. Plankton Res., 18, 2017–2026, https://doi.org/10.1093/plankt/18.11.2017, 1996.
Trull, T. W., Bray, S. G., Manganini, S. J., Honjo, S., and François, R.:
Moored sediment trap measurements of carbon export in the Subantarctic and
Polar Frontal zones of the Southern Ocean, south of Australia, J. Geophys.
Res.-Oceans, 106, 31489–31509, https://doi.org/10.1029/2000JC000308, 2001a.
Trull, T. W., Rintoul, S. R., Hadfield, M., and Abraham, E. R.: Circulation
and seasonal evolution of polar waters south of Australia: implications for
iron fertilization of the Southern Ocean, Deep-Sea Res. Pt. II, 48,
2439–2466, https://doi.org/10.1016/S0967-0645(01)00003-0, 2001b.
Trull, T. W., Sedwick, P. N., Griffiths, F. B., and Rintoul, S. R.:
Introduction to special section: SAZ Project, J. Geophys. Res.-Oceans, 106,
31425–31429, https://doi.org/10.1029/2001JC001008, 2001c.
Trull, T. W., Passmore, A., Davies, D. M., Smit, T., Berry, K., and Tilbrook,
B.: Distribution of planktonic biogenic carbonate organisms in the Southern
Ocean south of Australia: a baseline for ocean acidification impact
assessment, Biogeosciences, 15, 31–49,
https://doi.org/10.5194/bg-15-31-2018, 2018.
Turner, J. T.: Zooplankton fecal pellets, marine snow and sinking
phytoplankton blooms, Aquat. Microb. Ecol., 27, 57–102, 2002.
Turner, J. T.: Zooplankton fecal pellets, marine snow, phytodetritus and the
ocean's biological pump, Prog. Oceanogr., 130, 205–248,
https://doi.org/10.1016/j.pocean.2014.08.005, 2015.
Wilks, J. V., Rigual-Hernández, A. S., Trull, T. W., Bray, S. G., Flores,
J.-A., and Armand, L. K.: Biogeochemical flux and phytoplankton succession: A
year-long sediment trap record in the Australian sector of the Subantarctic
Zone, Deep-Sea Res. Pt. I, 121, 143–159, https://doi.org/10.1016/j.dsr.2017.01.001,
2017.
Winter, A., Henderiks, J., Beaufort, L., Rickaby, R. E., and Brown, C. W.:
Poleward expansion of the coccolithophore Emiliania huxleyi, J.
Plankton Res., 36, 316–325, 2014.
Young, J., Geisen, M., Cross, L., Kleijne, A., Sprengel, C., Probert, I., and
Østergaard, J.: A guide to extant coccolithophore taxonomy, Journal of
Nanoplankton Research Special Issue 1, International Nannoplankton
Association, 124 pp., 2003.
Young, J. R. and Westbroek, P.: Genotypic variation in the coccolithophorid
species Emiliania huxleyi, Mar. Micropaleontol., 18, 5–23,
https://doi.org/10.1016/0377-8398(91)90004-P, 1991.
Young, J. R. and Ziveri, P.: Calculation of coccolith volume and it use in
calibration of carbonate flux estimates, Deep-Sea Res. Pt. II, 47,
1679–1700, https://doi.org/10.1016/S0967-0645(00)00003-5, 2000.
Zeebe, R. E.: History of Seawater Carbonate Chemistry, Atmospheric CO2,
and Ocean Acidification, Annu. Rev. Earth Planet. Sc., 40, 141–165,
https://doi.org/10.1146/annurev-earth-042711-105521, 2012.
Zeldis, J.: Mesozooplankton community composition, feeding, and export
production during SOIREE, Deep-Sea Res. Pt. II, 48, 2615–2634,
https://doi.org/10.1016/S0967-0645(01)00011-X, 2001.
Zhang, X., Lewis, M., Lee, M., Johnson, B., and Korotaev, G.: The volume
scattering function of natural bubble populations, Limnol. Oceanogr., 47,
1273–1282, 2002.
Zondervan, I.: The effects of light, macronutrients, trace metals and CO2
on the production of calcium carbonate and organic carbon in coccolithophores
– A review, Deep-Sea Res. Pt. II, 54, 521–537,
https://doi.org/10.1016/j.dsr2.2006.12.004, 2007.
Short summary
Long-term and annual field observations on key organisms are a critical basis for predicting changes in Southern Ocean ecosystems. Coccolithophores are the most abundant calcium-carbonate-producing phytoplankton and play an important role in Southern Ocean biogeochemical cycles. In this study we document the composition, degree of calcification and annual cycle of coccolithophore communities in one of the largest unexplored regions of the world oceans: the Antarctic zone.
Long-term and annual field observations on key organisms are a critical basis for predicting...
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