Articles | Volume 10, issue 10
https://doi.org/10.5194/bg-10-6639-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-10-6639-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
23 Oct 2013
Research article |
| 23 Oct 2013
Calcification intensity in planktonic Foraminifera reflects ambient conditions irrespective of environmental stress
M. F. G. Weinkauf
Eberhard Karls Universität, Mathematisch–Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Hölderlinstraße 12, 72074 Tübingen, Germany
MARUM, Leobener Straße, 28359 Bremen, Germany
T. Moller
Eberhard Karls Universität, Mathematisch–Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Hölderlinstraße 12, 72074 Tübingen, Germany
M. C. Koch
Johann Wolfgang Goethe-Universität, Institut für Geowissenschaften, Facheinheit Paläontologie, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
M. Kučera
MARUM, Leobener Straße, 28359 Bremen, Germany
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The study assessed the population dynamics of living planktic foraminifers on a weekly, seasonal, and interannual timescale off the coast of Puerto Rico to improve our understanding of short- and long-term variations. The results indicate a seasonal change of the faunal composition, and over the last decades. Lower standing stocks and lower stable carbon isotope values of foraminifers in shallow waters can be linked to the hurricane Sandy, which passed the Greater Antilles during autumn 2012.
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The variability in the geochemistry among individual foraminifera is used to reconstruct seasonal to interannual climate variability. This method requires that each foraminifera shell accurately records environmental conditions, which we test here using a sediment trap time series. Even in the absence of environmental variability, planktonic foraminifera display variability in their stable isotope ratios that needs to be considered in the interpretation of individual foraminifera data.
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Douglas Lessa, Raphaël Morard, Lukas Jonkers, Igor M. Venancio, Runa Reuter, Adrian Baumeister, Ana Luiza Albuquerque, and Michal Kucera
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Haruka Takagi, Katsunori Kimoto, Tetsuichi Fujiki, Hiroaki Saito, Christiane Schmidt, Michal Kucera, and Kazuyoshi Moriya
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Andreia Rebotim, Antje Helga Luise Voelker, Lukas Jonkers, Joanna J. Waniek, Michael Schulz, and Michal Kucera
J. Micropalaeontol., 38, 113–131, https://doi.org/10.5194/jm-38-113-2019, https://doi.org/10.5194/jm-38-113-2019, 2019
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To reconstruct subsurface water conditions using deep-dwelling planktonic foraminifera, we must fully understand how the oxygen isotope signal incorporates into their shell. We report δ18O in four species sampled in the eastern North Atlantic with plankton tows. We assess the size and crust effect on the isotopic δ18O and compared them with predictions from two equations. We reveal different patterns of calcite addition with depth, highlighting the need to perform species-specific calibrations.
Lukas Jonkers and Michal Kučera
Clim. Past, 15, 881–891, https://doi.org/10.5194/cp-15-881-2019, https://doi.org/10.5194/cp-15-881-2019, 2019
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Fossil plankton assemblages have been widely used to reconstruct SST. In such approaches, full taxonomic resolution is often used. We assess whether this is required for reliable reconstructions as some species may not respond to SST. We find that only a few species are needed for low reconstruction errors but that species selection has a pronounced effect on reconstructions. We suggest that the sensitivity of a reconstruction to species pruning can be used as a measure of its robustness.
Nadia Al-Sabouni, Isabel S. Fenton, Richard J. Telford, and Michal Kučera
J. Micropalaeontol., 37, 519–534, https://doi.org/10.5194/jm-37-519-2018, https://doi.org/10.5194/jm-37-519-2018, 2018
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Kerstin Kretschmer, Lukas Jonkers, Michal Kucera, and Michael Schulz
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The fossil shells of planktonic foraminifera are widely used to reconstruct past climate conditions. To do so, information about their seasonal and vertical habitat is needed. Here we present an updated version of a planktonic foraminifera model to better understand species-specific habitat dynamics under climate change. This model produces spatially and temporally coherent distribution patterns, which agree well with available observations, and can thus aid the interpretation of proxy records.
Raphaël Morard, Franck Lejzerowicz, Kate F. Darling, Béatrice Lecroq-Bennet, Mikkel Winther Pedersen, Ludovic Orlando, Jan Pawlowski, Stefan Mulitza, Colomban de Vargas, and Michal Kucera
Biogeosciences, 14, 2741–2754, https://doi.org/10.5194/bg-14-2741-2017, https://doi.org/10.5194/bg-14-2741-2017, 2017
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The exploitation of deep-sea sedimentary archive relies on the recovery of mineralized skeletons of pelagic organisms. Planktonic groups leaving preserved remains represent only a fraction of the total marine diversity. Environmental DNA left by non-fossil organisms is a promising source of information for paleo-reconstructions. Here we show how planktonic-derived environmental DNA preserves ecological structure of planktonic communities. We use planktonic foraminifera as a case study.
Lukas Jonkers and Michal Kučera
Clim. Past, 13, 573–586, https://doi.org/10.5194/cp-13-573-2017, https://doi.org/10.5194/cp-13-573-2017, 2017
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Planktonic foraminifera – the most important proxy carriers in palaeoceanography – adjust their seasonal and vertical habitat. They are thought to do so in a way that minimises the change in their environment, implying that proxy records based on these organisms may not capture the full amplitude of past climate change. Here we demonstrate that they indeed track a particular thermal habitat and suggest that this could lead to a 40 % underestimation of reconstructed temperature change.
Philipp M. Munz, Stephan Steinke, Anna Böll, Andreas Lückge, Jeroen Groeneveld, Michal Kucera, and Hartmut Schulz
Clim. Past, 13, 491–509, https://doi.org/10.5194/cp-13-491-2017, https://doi.org/10.5194/cp-13-491-2017, 2017
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We present the results of several independent proxies of summer SST and upwelling SST from the Oman margin indicative of monsoon strength during the early Holocene. In combination with indices of carbonate preservation and bottom water redox conditions, we demonstrate that a persistent solar influence was modulating summer monsoon intensity. Furthermore, bottom water conditions are linked to atmospheric forcing, rather than changes of intermediate water masses.
Andreia Rebotim, Antje H. L. Voelker, Lukas Jonkers, Joanna J. Waniek, Helge Meggers, Ralf Schiebel, Igaratza Fraile, Michael Schulz, and Michal Kucera
Biogeosciences, 14, 827–859, https://doi.org/10.5194/bg-14-827-2017, https://doi.org/10.5194/bg-14-827-2017, 2017
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Planktonic foraminifera species depth habitat remains poorly constrained and the existing conceptual models are not sufficiently tested by observational data. Here we present a synthesis of living planktonic foraminifera abundance data in the subtropical eastern North Atlantic from vertical plankton tows. We also test potential environmental factors influencing the species depth habitat and investigate yearly or lunar migration cycles. These findings may impact paleoceanographic studies.
L. Jonkers and M. Kučera
Biogeosciences, 12, 2207–2226, https://doi.org/10.5194/bg-12-2207-2015, https://doi.org/10.5194/bg-12-2207-2015, 2015
I. Hessler, S. P. Harrison, M. Kucera, C. Waelbroeck, M.-T. Chen, C. Anderson, A. de Vernal, B. Fréchette, A. Cloke-Hayes, G. Leduc, and L. Londeix
Clim. Past, 10, 2237–2252, https://doi.org/10.5194/cp-10-2237-2014, https://doi.org/10.5194/cp-10-2237-2014, 2014
A. J. Enge, U. Witte, M. Kucera, and P. Heinz
Biogeosciences, 11, 2017–2026, https://doi.org/10.5194/bg-11-2017-2014, https://doi.org/10.5194/bg-11-2017-2014, 2014
Y. Milker, R. Rachmayani, M. F. G. Weinkauf, M. Prange, M. Raitzsch, M. Schulz, and M. Kučera
Clim. Past, 9, 2231–2252, https://doi.org/10.5194/cp-9-2231-2013, https://doi.org/10.5194/cp-9-2231-2013, 2013
R. J. Telford, C. Li, and M. Kucera
Clim. Past, 9, 859–870, https://doi.org/10.5194/cp-9-859-2013, https://doi.org/10.5194/cp-9-859-2013, 2013
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Caroline Thaler, Guillaume Paris, Marc Dellinger, Delphine Dissard, Sophie Berland, Arul Marie, Amandine Labat, and Annachiara Bartolini
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Karin E. Limburg, Yvette Heimbrand, and Karol Kuliński
Biogeosciences, 20, 4751–4760, https://doi.org/10.5194/bg-20-4751-2023, https://doi.org/10.5194/bg-20-4751-2023, 2023
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Human CO2 emissions are modifying ocean carbonate chemistry, causing ocean acidification and likely already impacting marine ecosystems. Here, we added CO2 to intertidal pools at the start of emersion to investigate the influence of future ocean acidification on net community production (NCP) and calcification (NCC). By day, adding CO2 fertilized the pools (+20 % NCP). By night, pools experienced net community dissolution, a dissolution that was further increased (+40 %) by the CO2 addition.
Karim Benzerara, Agnès Elmaleh, Maria Ciobanu, Alexis De Wever, Paola Bertolino, Miguel Iniesto, Didier Jézéquel, Purificación López-García, Nicolas Menguy, Elodie Muller, Fériel Skouri-Panet, Sufal Swaraj, Rosaluz Tavera, Christophe Thomazo, and David Moreira
Biogeosciences, 20, 4183–4195, https://doi.org/10.5194/bg-20-4183-2023, https://doi.org/10.5194/bg-20-4183-2023, 2023
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Iron and manganese are poorly soluble in oxic and alkaline solutions but much more soluble under anoxic conditions. As a result, authigenic minerals rich in Fe and/or Mn have been viewed as diagnostic of anoxic conditions. However, here we reveal a new case of biomineralization by specific cyanobacteria, forming abundant Fe(III)- and Mn(IV)-rich amorphous phases under oxic conditions in an alkaline lake. This might be an overlooked biotic contribution to the scavenging of Fe from water columns.
Sara Ronca, Francesco Mura, Marco Brandano, Angela Cirigliano, Francesca Benedetti, Alessandro Grottoli, Massimo Reverberi, Daniele Federico Maras, Rodolfo Negri, Ernesto Di Mauro, and Teresa Rinaldi
Biogeosciences, 20, 4135–4145, https://doi.org/10.5194/bg-20-4135-2023, https://doi.org/10.5194/bg-20-4135-2023, 2023
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The history of Earth is a story of the co-evolution of minerals and microbes. We present the evidence that moonmilk precipitation is driven by microorganisms within the rocks and not only on the rock surfaces. Moreover, the moonmilk produced within the rocks contributes to rock formation. The calcite speleothem moonmilk is the only known carbonate speleothem on Earth with undoubted biogenic origin, thus representing a biosignature of life.
Laura Pacho, Lennart de Nooijer, and Gert-Jan Reichart
Biogeosciences, 20, 4043–4056, https://doi.org/10.5194/bg-20-4043-2023, https://doi.org/10.5194/bg-20-4043-2023, 2023
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We analyzed Mg / Ca and other El / Ca (Na / Ca, B / Ca, Sr / Ca and Ba / Ca) in Nodosariata. Their calcite chemistry is markedly different to that of the other calcifying orders of foraminifera. We show a relation between the species average Mg / Ca and its sensitivity to changes in temperature. Differences were reflected in both the Mg incorporation and the sensitivities of Mg / Ca to temperature.
João Pedro Saldanha, Joice Cagliari, Rodrigo Scalise Horodyski, Lucas Del Mouro, and Mírian Liza Alves Forancelli Pacheco
Biogeosciences, 20, 3943–3979, https://doi.org/10.5194/bg-20-3943-2023, https://doi.org/10.5194/bg-20-3943-2023, 2023
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We analyze a complex and branched mineral structure with an obscure origin, considering form, matrix, composition, and context. Comparisons eliminate controlled biominerals. The structure's intricate history suggests microbial influence and alterations, followed by a thermal event. Complex interactions shaped its forms, making origin classification tougher. This study highlights the elaborated nature of dubiofossils, identifying challenges in distinguishing biominerals from abiotic minerals.
Marlisa Martinho de Brito, Irina Bundeleva, Frédéric Marin, Emmanuelle Vennin, Annick Wilmotte, Laurent Plasseraud, and Pieter T. Visscher
Biogeosciences, 20, 3165–3183, https://doi.org/10.5194/bg-20-3165-2023, https://doi.org/10.5194/bg-20-3165-2023, 2023
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Cyanobacterial blooms are associated with whiting events – natural occurrences of fine-grained carbonate precipitation in the water column. The role of organic matter (OM) produced by cyanobacteria in these events has been overlooked in previous research. Our laboratory experiments showed that OM affects the size and quantity of CaCO3 minerals. We propose a model of OM-associated CaCO3 precipitation during picoplankton blooms, which may have been neglected in modern and ancient events.
Giancarlo Sidoti, Federica Antonelli, Giulia Galotta, Maria Cristina Moscatelli, Davor Kržišnik, Vittorio Vinciguerra, Swati Tamantini, Rosita Marabottini, Natalia Macro, and Manuela Romagnoli
Biogeosciences, 20, 3137–3149, https://doi.org/10.5194/bg-20-3137-2023, https://doi.org/10.5194/bg-20-3137-2023, 2023
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The mineral content in archaeological wood pile dwellings and in the surrounding sediments in a volcanic lake was investigated. Calcium was the most abundant element; the second most abundant element was arsenic in sapwood. Sulfur, iron and potassium were also present. The mineral compounds are linked to the volcanic origin of the lake, to bioaccumulation processes induced by bacteria (i.e. sulfate-reducing bacteria) and to biochemical processes.
Niels J. de Winter, Daniel Killam, Lukas Fröhlich, Lennart de Nooijer, Wim Boer, Bernd R. Schöne, Julien Thébault, and Gert-Jan Reichart
Biogeosciences, 20, 3027–3052, https://doi.org/10.5194/bg-20-3027-2023, https://doi.org/10.5194/bg-20-3027-2023, 2023
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Mollusk shells are valuable recorders of climate and environmental changes of the past down to a daily resolution. To explore this potential, we measured changes in the composition of shells of two types of bivalves recorded at the hourly scale: the king scallop Pecten maximus and giant clams (Tridacna) that engaged in photosymbiosis. We find that photosymbiosis produces more day–night fluctuation in shell chemistry but that most of the variation is not periodic, perhaps recording weather.
Kristian Spilling, Jonna Piiparinen, Eric P. Achterberg, Javier Arístegui, Lennart T. Bach, Maria T. Camarena-Gómez, Elisabeth von der Esch, Martin A. Fischer, Markel Gómez-Letona, Nauzet Hernández-Hernández, Judith Meyer, Ruth A. Schmitz, and Ulf Riebesell
Biogeosciences, 20, 1605–1619, https://doi.org/10.5194/bg-20-1605-2023, https://doi.org/10.5194/bg-20-1605-2023, 2023
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We carried out an enclosure experiment using surface water off Peru with different additions of oxygen minimum zone water. In this paper, we report on enzyme activity and provide data on the decomposition of organic matter. We found very high activity with respect to an enzyme breaking down protein, suggesting that this is important for nutrient recycling both at present and in the future ocean.
Thomas Letulle, Danièle Gaspard, Mathieu Daëron, Florent Arnaud-Godet, Arnauld Vinçon-Laugier, Guillaume Suan, and Christophe Lécuyer
Biogeosciences, 20, 1381–1403, https://doi.org/10.5194/bg-20-1381-2023, https://doi.org/10.5194/bg-20-1381-2023, 2023
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This paper studies the chemistry of modern marine shells called brachiopods. We investigate the relationship of the chemistry of these shells with sea temperatures to test and develop tools for estimating sea temperatures in the distant past. Our results confirm that two of the investigated chemical markers could be useful thermometers despite some second-order variability independent of temperature. The other chemical markers investigated, however, should not be used as a thermometer.
Franziska Tell, Lukas Jonkers, Julie Meilland, and Michal Kucera
Biogeosciences, 19, 4903–4927, https://doi.org/10.5194/bg-19-4903-2022, https://doi.org/10.5194/bg-19-4903-2022, 2022
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This study analyses the production of calcite shells formed by one of the main Arctic pelagic calcifiers, the foraminifera N. pachyderma. Using vertically resolved profiles of shell concentration, size and weight, we show that calcification occurs throughout the upper 300 m with an average production flux below the calcification zone of 8 mg CaCO3 m−2 d−1 representing 23 % of the total pelagic biogenic carbonate production. The production flux is attenuated in the twilight zone by dissolution.
Paweł Działak, Marcin D. Syczewski, Kamil Kornaus, Mirosław Słowakiewicz, Łukasz Zych, and Andrzej Borkowski
Biogeosciences, 19, 4533–4550, https://doi.org/10.5194/bg-19-4533-2022, https://doi.org/10.5194/bg-19-4533-2022, 2022
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Bacteriophages comprise one of the factors that may influence mineralization processes. The number of bacteriophages in the environment usually exceeds the number of bacteria by an order of magnitude. One of the more interesting processes is the formation of framboidal pyrite, and it is not entirely clear what processes determine its formation. Our studies indicate that some bacterial viruses may influence the formation of framboid-like or spherical structures.
Philipp M. Spreter, Markus Reuter, Regina Mertz-Kraus, Oliver Taylor, and Thomas C. Brachert
Biogeosciences, 19, 3559–3573, https://doi.org/10.5194/bg-19-3559-2022, https://doi.org/10.5194/bg-19-3559-2022, 2022
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We investigate the calcification rate of reef corals from an upwelling zone, where low seawater pH and high nutrient concentrations represent a recent analogue for the future ocean. Calcification rate of the corals largely relies on extension growth. Variable responses of extension growth to nutrients either compensate or exacerbate negative effects of weak skeletal thickening associated with low seawater pH – a mechanism that is critical for the persistence of coral reefs under global change.
Giulia Piazza, Valentina A. Bracchi, Antonio Langone, Agostino N. Meroni, and Daniela Basso
Biogeosciences, 19, 1047–1065, https://doi.org/10.5194/bg-19-1047-2022, https://doi.org/10.5194/bg-19-1047-2022, 2022
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The coralline alga Lithothamnion corallioides is widely distributed in the Mediterranean Sea and NE Atlantic Ocean, where it constitutes rhodolith beds, which are diversity-rich ecosystems on the seabed. The boron incorporated in the calcified thallus of coralline algae (B/Ca) can be used to trace past changes in seawater carbonate and pH. This paper suggests a non-negligible effect of algal growth rate on B/Ca, recommending caution in adopting this proxy for paleoenvironmental reconstructions.
Sarina Schmidt, Ed C. Hathorne, Joachim Schönfeld, and Dieter Garbe-Schönberg
Biogeosciences, 19, 629–664, https://doi.org/10.5194/bg-19-629-2022, https://doi.org/10.5194/bg-19-629-2022, 2022
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The study addresses the potential of marine shell-forming organisms as proxy carriers for heavy metal contamination in the environment. The aim is to investigate if the incorporation of heavy metals is a direct function of their concentration in seawater. Culturing experiments with a metal mixture were carried out over a wide concentration range. Our results show shell-forming organisms to be natural archives that enable the determination of metals in polluted and pristine environments.
Valentina Alice Bracchi, Giulia Piazza, and Daniela Basso
Biogeosciences, 18, 6061–6076, https://doi.org/10.5194/bg-18-6061-2021, https://doi.org/10.5194/bg-18-6061-2021, 2021
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Ultrastructures of Lithothamnion corallioides, a crustose coralline alga collected from the Atlantic and Mediterranean Sea at different depths, show high-Mg-calcite cell walls formed by crystals with a specific shape and orientation that are unaffected by different environmental conditions of the living sites. This suggests that the biomineralization process is biologically controlled in coralline algae and can have interesting applications in paleontology.
Trystan Sanders, Jörn Thomsen, Jens Daniel Müller, Gregor Rehder, and Frank Melzner
Biogeosciences, 18, 2573–2590, https://doi.org/10.5194/bg-18-2573-2021, https://doi.org/10.5194/bg-18-2573-2021, 2021
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The Baltic Sea is expected to experience a rapid drop in salinity and increases in acidity and warming in the next century. Calcifying mussels dominate Baltic Sea seafloor ecosystems yet are sensitive to changes in seawater chemistry. We combine laboratory experiments and a field study and show that a lack of calcium causes extremely slow growth rates in mussels at low salinities. Subsequently, climate change in the Baltic may have drastic ramifications for Baltic seafloor ecosystems.
Luc Beaufort, Yves Gally, Baptiste Suchéras-Marx, Patrick Ferrand, and Julien Duboisset
Biogeosciences, 18, 775–785, https://doi.org/10.5194/bg-18-775-2021, https://doi.org/10.5194/bg-18-775-2021, 2021
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The coccoliths are major contributors to the particulate inorganic carbon in the ocean. They are extremely difficult to weigh because they are too small to be manipulated. We propose a universal method to measure thickness and weight of fine calcite using polarizing microscopy that does not require fine-tuning of the light or a calibration process. This method named "bidirectional circular polarization" uses two images taken with two directions of a circular polarizer.
Anna Piwoni-Piórewicz, Stanislav Strekopytov, Emma Humphreys-Williams, and Piotr Kukliński
Biogeosciences, 18, 707–728, https://doi.org/10.5194/bg-18-707-2021, https://doi.org/10.5194/bg-18-707-2021, 2021
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Calcifying organisms occur globally in almost every environment, and the process of biomineralization is of great importance in the global carbon cycle and use of skeletons as environmental data archives. The composition of skeletons is very complex. It is determined by the mechanisms of biological control on biomineralization and the response of calcifying organisms to varying environmental drivers. Yet for trace elements, such as Cu, Pb and Cd, an impact of environmental factors is pronounced.
Siham de Goeyse, Alice E. Webb, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 393–401, https://doi.org/10.5194/bg-18-393-2021, https://doi.org/10.5194/bg-18-393-2021, 2021
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Foraminifera are calcifying organisms that play a role in the marine inorganic-carbon cycle and are widely used to reconstruct paleoclimates. However, the fundamental process by which they calcify remains essentially unknown. Here we use inhibitors to show that an enzyme is speeding up the conversion between bicarbonate and CO2. This helps the foraminifera acquire sufficient carbon for calcification and might aid their tolerance to elevated CO2 level.
Anne Roepert, Lubos Polerecky, Esmee Geerken, Gert-Jan Reichart, and Jack J. Middelburg
Biogeosciences, 17, 4727–4743, https://doi.org/10.5194/bg-17-4727-2020, https://doi.org/10.5194/bg-17-4727-2020, 2020
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We investigated, for the first time, the spatial distribution of chlorine and fluorine in the shell walls of four benthic foraminifera species: Ammonia tepida, Amphistegina lessonii, Archaias angulatus, and Sorites marginalis. Cross sections of specimens were imaged using nanoSIMS. The distribution of Cl and F was co-located with organics in the rotaliids and rather homogeneously distributed in miliolids. We suggest that the incorporation is governed by the biomineralization pathway.
Vincent Mouchi, Camille Godbillot, Vianney Forest, Alexey Ulianov, Franck Lartaud, Marc de Rafélis, Laurent Emmanuel, and Eric P. Verrecchia
Biogeosciences, 17, 2205–2217, https://doi.org/10.5194/bg-17-2205-2020, https://doi.org/10.5194/bg-17-2205-2020, 2020
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Rare earth elements (REEs) in coastal seawater are included in bivalve shells during growth, and a regional fingerprint can be defined for provenance and environmental monitoring studies. We present a large dataset of REE abundances from oysters from six locations in France. The cupped oyster can be discriminated from one locality to another, but this is not the case for the flat oyster. Therefore, provenance studies using bivalve shells based on REEs are not adapted for the flat oyster.
Rosie L. Oakes and Jocelyn A. Sessa
Biogeosciences, 17, 1975–1990, https://doi.org/10.5194/bg-17-1975-2020, https://doi.org/10.5194/bg-17-1975-2020, 2020
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Pteropods are a group of tiny swimming snails whose fragile shells put them at risk from ocean acidification. We investigated the factors influencing the thickness of pteropods shells in the Cariaco Basin, off Venezuela, which is unaffected by ocean acidification. We found that pteropods formed thicker shells when nutrient concentrations, an indicator of food availability, were highest, indicating that food may be an important factor in mitigating the effects of ocean acidification on pteropods.
Miguel Gómez Batista, Marc Metian, François Oberhänsli, Simon Pouil, Peter W. Swarzenski, Eric Tambutté, Jean-Pierre Gattuso, Carlos M. Alonso Hernández, and Frédéric Gazeau
Biogeosciences, 17, 887–899, https://doi.org/10.5194/bg-17-887-2020, https://doi.org/10.5194/bg-17-887-2020, 2020
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In this paper, we assessed four methods (total alkalinity anomaly, calcium anomaly, 45Ca incorporation, and 13C incorporation) to determine coral calcification of a reef-building coral. Under all conditions (light vs. dark incubations and ambient vs. lowered pH levels), calcification rates estimated using the alkalinity and calcium anomaly techniques as well as 45Ca incorporation were highly correlated, while significantly different results were obtained with the 13C incorporation technique.
Alan Marron, Lucie Cassarino, Jade Hatton, Paul Curnow, and Katharine R. Hendry
Biogeosciences, 16, 4805–4813, https://doi.org/10.5194/bg-16-4805-2019, https://doi.org/10.5194/bg-16-4805-2019, 2019
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Isotopic signatures of silica fossils can be used as archives of past oceanic silicon cycling, which is linked to marine carbon uptake. However, the biochemistry that lies behind such chemical fingerprints remains poorly understood. We present the first measurements of silicon isotopes in a group of protists closely related to animals, choanoflagellates. Our results highlight a taxonomic basis to silica isotope signatures, possibly via a shared transport pathway in choanoflagellates and animals.
Laura M. Otter, Oluwatoosin B. A. Agbaje, Matt R. Kilburn, Christoph Lenz, Hadrien Henry, Patrick Trimby, Peter Hoppe, and Dorrit E. Jacob
Biogeosciences, 16, 3439–3455, https://doi.org/10.5194/bg-16-3439-2019, https://doi.org/10.5194/bg-16-3439-2019, 2019
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This study uses strontium as a trace elemental marker in combination with high-resolution nano-analytical techniques to label the growth fronts of bivalves in controlled aquaculture conditions. The growing shells incorporate the labels and are used as
snapshotsvisualizing the growth processes across different shell architectures. These observations are combined with structural investigations across length scales and altogether allow for a detailed understanding of this shell.
Simon Michael Ritter, Margot Isenbeck-Schröter, Christian Scholz, Frank Keppler, Johannes Gescher, Lukas Klose, Nils Schorndorf, Jerónimo Avilés Olguín, Arturo González-González, and Wolfgang Stinnesbeck
Biogeosciences, 16, 2285–2305, https://doi.org/10.5194/bg-16-2285-2019, https://doi.org/10.5194/bg-16-2285-2019, 2019
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Unique and spectacular under water speleothems termed as Hells Bells were recently reported from sinkholes (cenotes) of the Yucatán Peninsula, Mexico. However, the mystery of their formation remained unresolved. Here, we present detailed geochemical analyses and delineate that the growth of Hells Bells results from a combination of biogeochemical processes and variable hydraulic conditions within the cenote.
Andrew C. Mitchell, Erika J. Espinosa-Ortiz, Stacy L. Parks, Adrienne J. Phillips, Alfred B. Cunningham, and Robin Gerlach
Biogeosciences, 16, 2147–2161, https://doi.org/10.5194/bg-16-2147-2019, https://doi.org/10.5194/bg-16-2147-2019, 2019
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Microbially induced carbonate mineral precipitation (MICP) is a natural process that is also being investigated for subsurface engineering applications including radionuclide immobilization and microfracture plugging. We demonstrate that rates of MICP from microbial urea hydrolysis (ureolysis) vary with different bacterial strains, but rates are similar in both oxygenated and oxygen-free conditions. Ureolysis MICP is therefore a viable biotechnology in the predominately oxygen-free subsurface.
Inge van Dijk, Christine Barras, Lennart Jan de Nooijer, Aurélia Mouret, Esmee Geerken, Shai Oron, and Gert-Jan Reichart
Biogeosciences, 16, 2115–2130, https://doi.org/10.5194/bg-16-2115-2019, https://doi.org/10.5194/bg-16-2115-2019, 2019
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Systematics in the incorporation of different elements in shells of marine organisms can be used to test calcification models and thus processes involved in precipitation of calcium carbonates. On different scales, we observe a covariation of sulfur and magnesium incorporation in shells of foraminifera, which provides insights into the mechanics behind shell formation. The observed patterns imply that all species of foraminifera actively take up calcium and carbon in a coupled process.
Eveline M. Mezger, Lennart J. de Nooijer, Jacqueline Bertlich, Jelle Bijma, Dirk Nürnberg, and Gert-Jan Reichart
Biogeosciences, 16, 1147–1165, https://doi.org/10.5194/bg-16-1147-2019, https://doi.org/10.5194/bg-16-1147-2019, 2019
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Seawater salinity is an important factor when trying to reconstruct past ocean conditions. Foraminifera, small organisms living in the sea, produce shells that incorporate more Na at higher salinities. The accuracy of reconstructions depends on the fundamental understanding involved in the incorporation and preservation of the original Na of the shell. In this study, we unravel the Na composition of different components of the shell and describe the relative contribution of these components.
Hengchao Xu, Xiaotong Peng, Shijie Bai, Kaiwen Ta, Shouye Yang, Shuangquan Liu, Ho Bin Jang, and Zixiao Guo
Biogeosciences, 16, 949–960, https://doi.org/10.5194/bg-16-949-2019, https://doi.org/10.5194/bg-16-949-2019, 2019
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Viruses have been acknowledged as important components of the marine system for the past 2 decades, but understanding of their role in the functioning of the geochemical cycle remains poor. Results show viral lysis of cyanobacteria can influence the carbonate equilibrium system remarkably and promotes the formation and precipitation of carbonate minerals. Amorphous calcium carbonate (ACC) and aragonite are evident in the lysate, implying that different precipitation processes have occurred.
Nicole M. J. Geerlings, Eva-Maria Zetsche, Silvia Hidalgo-Martinez, Jack J. Middelburg, and Filip J. R. Meysman
Biogeosciences, 16, 811–829, https://doi.org/10.5194/bg-16-811-2019, https://doi.org/10.5194/bg-16-811-2019, 2019
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Multicellular cable bacteria form long filaments that can reach lengths of several centimeters. They affect the chemistry and mineralogy of their surroundings and vice versa. How the surroundings affect the cable bacteria is investigated. They show three different types of biomineral formation: (1) a polymer containing phosphorus in their cells, (2) a sheath of clay surrounding the surface of the filament and (3) the encrustation of a filament via a solid phase containing iron and phosphorus.
Facheng Ye, Hana Jurikova, Lucia Angiolini, Uwe Brand, Gaia Crippa, Daniela Henkel, Jürgen Laudien, Claas Hiebenthal, and Danijela Šmajgl
Biogeosciences, 16, 617–642, https://doi.org/10.5194/bg-16-617-2019, https://doi.org/10.5194/bg-16-617-2019, 2019
Yukiko Nagai, Katsuyuki Uematsu, Chong Chen, Ryoji Wani, Jarosław Tyszka, and Takashi Toyofuku
Biogeosciences, 15, 6773–6789, https://doi.org/10.5194/bg-15-6773-2018, https://doi.org/10.5194/bg-15-6773-2018, 2018
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We interpret detailed SEM and time-lapse observations of the calcification process in living foraminifera, which we reveal to be directly linked to the construction mechanism of organic membranes where the calcium carbonate precipitation takes place. We show that these membranes are a highly perforated outline is first woven by skeletal pseudopodia and then later overlaid by a layer of membranous pseudopodia to close the gaps. The chemical composition is related to these structures.
Agathe Martignier, Montserrat Filella, Kilian Pollok, Michael Melkonian, Michael Bensimon, François Barja, Falko Langenhorst, Jean-Michel Jaquet, and Daniel Ariztegui
Biogeosciences, 15, 6591–6605, https://doi.org/10.5194/bg-15-6591-2018, https://doi.org/10.5194/bg-15-6591-2018, 2018
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The unicellular microalga Tetraselmis cordiformis (Chlorophyta) was recently discovered to form intracellular mineral inclusions, called micropearls, which had been previously overlooked. The present study shows that 10 Tetraselmis species out of the 12 tested share this biomineralization capacity, producing amorphous calcium carbonate inclusions often enriched in Sr. This novel biomineralization process can take place in marine, brackish or freshwater and is therefore a widespread phenomenon.
Ulrike Braeckman, Felix Janssen, Gaute Lavik, Marcus Elvert, Hannah Marchant, Caroline Buckner, Christina Bienhold, and Frank Wenzhöfer
Biogeosciences, 15, 6537–6557, https://doi.org/10.5194/bg-15-6537-2018, https://doi.org/10.5194/bg-15-6537-2018, 2018
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Global warming has altered Arctic phytoplankton communities, with unknown effects on deep-sea communities that depend strongly on food produced at the surface. We compared the responses of Arctic deep-sea benthos to input of phytodetritus from diatoms and coccolithophorids. Coccolithophorid carbon was 5× less recycled than diatom carbon. The utilization of the coccolithophorid carbon may be less efficient, so a shift from diatom to coccolithophorid blooms could entail a delay in carbon cycling.
Hongrui Zhang, Heather Stoll, Clara Bolton, Xiaobo Jin, and Chuanlian Liu
Biogeosciences, 15, 4759–4775, https://doi.org/10.5194/bg-15-4759-2018, https://doi.org/10.5194/bg-15-4759-2018, 2018
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The sinking speeds of coccoliths are relevant for laboratory methods to separate coccoliths for geochemical analysis. However, in the absence of estimates of coccolith settling velocity, previous implementations have depended mainly on time-consuming method development by trial and error. In this study, the sinking velocities of cocooliths were carefully measured for the first time. We also provide an estimation of coccolith sinking velocity by shape, which will make coccolith separation easier.
Justin Michael Whitaker, Sai Vanapalli, and Danielle Fortin
Biogeosciences, 15, 4367–4380, https://doi.org/10.5194/bg-15-4367-2018, https://doi.org/10.5194/bg-15-4367-2018, 2018
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Materials, like soils or cements, can require repair. This study used a new bacterium (Sporosarcina ureae) in a repair method called "microbially induced carbonate precipitation" (MICP). In three trials, benefits were shown: S. ureae could make a model sandy soil much stronger by MICP, in fact better than a lot of other bacteria. However, MICP-treated samples got weaker in three trials of acid rain. In conclusion, S. ureae in MICP repair shows promise when used in appropriate climates.
Esmee Geerken, Lennart Jan de Nooijer, Inge van Dijk, and Gert-Jan Reichart
Biogeosciences, 15, 2205–2218, https://doi.org/10.5194/bg-15-2205-2018, https://doi.org/10.5194/bg-15-2205-2018, 2018
Jörn Thomsen, Kirti Ramesh, Trystan Sanders, Markus Bleich, and Frank Melzner
Biogeosciences, 15, 1469–1482, https://doi.org/10.5194/bg-15-1469-2018, https://doi.org/10.5194/bg-15-1469-2018, 2018
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The distribution of mussel in estuaries is limited but the mechanisms are not well understood. We document for the first time that reduced Ca2+ concentration in the low saline, brackish Baltic Sea affects the ability of mussel larvae to calcify the first larval shell. As complete formation of the shell is a prerequisite for successful development, impaired calcification during this sensitive life stage can have detrimental effects on the species' ability to colonize habitats.
Sha Ni, Isabelle Taubner, Florian Böhm, Vera Winde, and Michael E. Böttcher
Biogeosciences, 15, 1425–1445, https://doi.org/10.5194/bg-15-1425-2018, https://doi.org/10.5194/bg-15-1425-2018, 2018
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Spirorbis tube worms are common epibionts on brown algae in the Baltic Sea. We made experiments with Spirorbis in the
Kiel Outdoor Benthocosmsat CO2 and temperature conditions predicted for the year 2100. The worms were able to grow tubes even at CO2 levels favouring shell dissolution but did not survive at mean temperatures over 24° C. This indicates that Spirorbis worms will suffer from future excessive ocean warming and from ocean acidification fostering corrosion of their protective tubes.
Andrea C. Gerecht, Luka Šupraha, Gerald Langer, and Jorijntje Henderiks
Biogeosciences, 15, 833–845, https://doi.org/10.5194/bg-15-833-2018, https://doi.org/10.5194/bg-15-833-2018, 2018
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Calcifying phytoplankton play an import role in long-term CO2 removal from the atmosphere. We therefore studied the ability of a representative species to continue sequestrating CO2 under future climate conditions. We show that CO2 sequestration is negatively affected by both an increase in temperature and the resulting decrease in nutrient availability. This will impact the biogeochemical cycle of carbon and may have a positive feedback on rising CO2 levels.
Merinda C. Nash and Walter Adey
Biogeosciences, 15, 781–795, https://doi.org/10.5194/bg-15-781-2018, https://doi.org/10.5194/bg-15-781-2018, 2018
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Past seawater temperatures can be reconstructed using magnesium / calcium ratios of biogenic carbonates. As temperature increases, so does magnesium. Here we show that for these Arctic/subarctic coralline algae, anatomy is the first control on Mg / Ca, not temperature. When using coralline algae for temperature reconstruction, it is first necessary to check for anatomical influences on Mg / Ca.
Thomas M. DeCarlo, Juan P. D'Olivo, Taryn Foster, Michael Holcomb, Thomas Becker, and Malcolm T. McCulloch
Biogeosciences, 14, 5253–5269, https://doi.org/10.5194/bg-14-5253-2017, https://doi.org/10.5194/bg-14-5253-2017, 2017
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We present a new technique to quantify the chemical conditions under which corals build their skeletons by analysing them with lasers at a very fine resolution, down to 1/100th the width of a human hair. Our first applications to laboratory-cultured and wild corals demonstrates the complex interplay among seawater conditions (temperature and acidity), calcifying fluid chemistry, and bulk skeleton accretion, which will define the sensitivity of coral calcification to 21st century climate change.
Giulia Faucher, Linn Hoffmann, Lennart T. Bach, Cinzia Bottini, Elisabetta Erba, and Ulf Riebesell
Biogeosciences, 14, 3603–3613, https://doi.org/10.5194/bg-14-3603-2017, https://doi.org/10.5194/bg-14-3603-2017, 2017
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The main goal of this study was to understand if, similarly to the fossil record, high quantities of toxic metals induce coccolith dwarfism in coccolithophore species. We investigated, for the first time, the effects of trace metals on coccolithophore species other than E. huxleyi and on coccolith morphology and size. Our data show a species-specific sensitivity to trace metal concentration, allowing the recognition of the most-, intermediate- and least-tolerant taxa to trace metal enrichments.
Cited articles
Aldridge, D., Beer, C. J., and Purdie, D. A.: Calcfication in the planktonic Foraminifera Globigerina bulloides linked to phosphate concentrations in surface waters of the North Atlantic Ocean, Biogeosciences, 9, 1725–1739, https://doi.org/10.5194/bg-9-1725-2012, 2012.
Aurahs, R., Treis, Y., Darling, K., and Kučera, M.: A revised taxonomic and phylogenetic concept for the planktonic foraminifer species Globigerinoides ruber based on molecular and morphometric evidence, Mar. Micropaleontol., 79, 1–14, https://doi.org/10.1016/j.marmicro.2010.12.001, 2011.
Barker, S. and Elderfield, H.: Foraminiferal calcification response to glacial–interglacial changes in atmospheric CO2, Science, 297, 833–836, https://doi.org/10.1126/science.1072815, 2002.
Beer, C. J., Schiebel, R., and Wilson, P. A.: Technical note: On methodologies for determining the size-normalised weight of planktic Foraminifera, Biogeosciences, 7, 2193–2198, https://doi.org/10.5194/bg-7-2193-2010, 2010a.
Beer, C. J., Schiebel, R., and Wilson, P. A.: Testing planktic foraminiferal shell weight as a surface water [CO32-] proxy using plankton net samples, Geology, 38, 103–106, https://doi.org/10.1130/G30150.1, 2010b.
Bijma, J., Spero, H. J., and Lea, D. W.: Reassessing foraminiferal stable isotope geochemistry: Impact of the oceanic carbonate system (experimental results), in: Use of Proxies in Paleoceanography: Examples from the South Atlantic, edited by: Fischer, G. and Wefer, G., 489–512, Springer-Verlag, Berlin, Heidelberg, 1999.
Bleil, U., Brück, L., Frederichs, T., Haese, R., Hensen, C., Hilgenfeldt, C., Hoek, R., Hübscher, C., von Lom-Keil, H., Janke, A., Kreutz, R., Keenan, J., Little, M. L., Martens, H., Rosiak, U., Schmidt, W., Schneider, R., Segl, M., Spieß, V., Uenzelmann-Neben, G., Urbanek, H., and Zühlsdorff, L.: Geo Bremen South Atlantic 1996, \textscMeteor Berichte, Leitstelle \textscMeteor, Hamburg, 1997.
Broecker, W. and Clark, E.: An evaluation of Lohmann's Foraminifera weight dissolution index, Paleoceanography, 16, 531–534, https://doi.org/10.1029/2000PA000600, 2001.
Cane, T., Rohling, E. J., Kemp, A. E. S., Cooke, S., and Pearce, R. B.: High-resolution stratigraphic framework for Mediterranean Sapropel S5: Defining temporal relationships between records of Eemian climate variability, Palaeogeogr. Palaeocl. Palaeoecol., 183, 87–101, https://doi.org/10.1016/S0031-0182(01)00461-8, 2002.
Chierici, M. and Fransson, A.: Calcium carbonate saturation in the surface water of the Arctic Ocean: Undersaturation in freshwater influenced shelves, Biogeosciences, 6, 2421–2432, https://doi.org/10.5194/bg-6-2421-2009, 2009.
Conover, W. J.: Practical Nonparametric Statistics, Wiley Series in Probability and Mathematical Statistics, John Wiley & Sons, Ltd., New York, 1980.
Cramér, H.: Mathematical Methods of Statistics, vol. 9 of Princeton Mathematical Series, Princeton University Press, Princeton, 1946.
de Moel, H., Ganssen, G. M., Peeters, F. J. C., Jung, S. J. A., Kroon, D., Brummer, G. J. A., and Zeebe, R. E.: Planktic foraminiferal shell thinning in the Arabian Sea due to anthropogenic ocean acidification?, Biogeosciences, 6, 1917–1925, https://doi.org/10.5194/bg-6-1917-2009, 2009.
de Vargas, C., Norris, R., Zaninetti, L., Gibb, S. W., and Pawlowski, J.: Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces, P. Natl. Acad. Sci. USA, 96, 2864–2868, https://doi.org/10.1073/pnas.96.6.2864, 1999.
de Villiers, S.: Optimum growth conditions as opposed to calcite saturation as a control on the calcification rate and shell-weight of marine Foraminifera, Mar. Biol., 144, 45–49, https://doi.org/10.1007/s00227-003-1183-8, 2004.
Gasse, F.: Hydrological changes in the African tropics since the last glacial maximum, Quaternary Sci. Rev., 19, 189–211, https://doi.org/10.1016/S0277-3791(99)00061-X, 2000.
Hartigan, J. A. and Hartigan, P. M.: The Dip Test of unimodality, Ann. Stat., 13, 70–84, https://doi.org/10.1214/aos/1176346577, 1985.
Hayes, A., Kučera, M., Kallel, N., Sbaffi, L., and Rohling, E. J.: Glacial Mediterranean sea surface temperatures based on planktonic foraminiferal assemblages, Quaternary Sci. Rev., 24, 999–1016, https://doi.org/10.1016/j.quascirev.2004.02.018, 2005.
Hayward, B. W., Sabaa, A. T., Kawagata, S., and Grenfell, H. R.: The Early Pliocene re-colonisation of the deep Mediterranean Sea by benthic Foraminifera and their pulsed Late Pliocene–Middle Pleistocene decline. Mar. Micropal., 71, 97–112, https://doi.org/10.1016/j.marmicro.2009.01.008, 2009.
Helsel, D. R. and Hirsch, R. M.: Statistical methods in water resources, in: Hydrologic Analysis and Interpretation, vol. 4 of Techniques of Water-Resources Investigations Reports, chap. A3, 1–510, US Geological Survey, 2002.
Hemleben, C., Becker, T., Bellas, S., Benningsen, G., Casford, J., Cagatay, N., Emeis, K.-C., Engelen, B., Ertan, T., Fontanier, C., Friedrich, O., Frydas, D., Giunta, S., Hoffelner, H., Jorissen, F., Kahl, G., Kaszemeik, K., Lykousis, V., Meier, S., Nickel, G., Overman, J., Pross, J., Reichel, T., Robert, C., Rohling, E., Ruschmeier, W., Sakinc, M., Schiebel, R., Schmiedl, G., Schubert, K., Schulz, H., Tischnak, J., and Truscheit, T.: Ostatlantik–Mittelmeer–Schwarzes Meer Part 3: Cruise No. 51, Leg 3, \textscMeteor Berichte, Leitstelle \textscMeteor, Hamburg, 2003.
Hoelzmann, P., Kruse, H.-J., and Rottinger, F.: Precipitation estimates for the eastern Saharan palaeomonsoon based on a water balance model of the West Nubian Palaeolake Basin, Global Planet. Change, 26, 105–120, https://doi.org/10.1016/S0921-8181(00)00038-2, 2000.
Hyndman, R. J. and Fan, Y.: Sample quantiles in statistical packages, Am. Stat., 50, 361–365, https://doi.org/10.1080/00031305.1996.10473566, 1996.
Kendall, M. G.: A new measurement of rank correlation, Biometrika, 30, 81–93, https://doi.org/10.1093/biomet/30.1-2.81, 1938.
Kučera, M., Weinelt, M., Kiefer, T., Pflaumann, U., Hayes, A., Weinelt, M., Chen, M.-T., Mix, A. C., Barrows, T. T., Cortijo, E., Duprat, J., Juggins, S., and Waelbroeck, C.: Reconstruction of sea-surface temperatures from assemblages of planktonic Foraminifera: Multi-technique approach based on geographically constrained calibration data sets and its application to glacial Atlantic and Pacific Oceans, Quaternary Sci. Rev., 24, 951–998, https://doi.org/10.1016/j.quascirev.2004.07.014, 2005.
Lohmann, G. P.: A model for variation in the chemistry of planktonic Foraminifera due to secondary calcification selective dissolution, Paleoceanography, 10, 445–457, https://doi.org/10.1029/95PA00059, 1995.
Lombard, F., da Rocha, R. E., Bijma, J., and Gattuso, J.-P.: Effect of carbonate ion concentration and irradiance on calcfication in planktonic Foraminifera, Biogeosciences, 7, 247–255, https://doi.org/10.5194/bg-7-247-2010, 2010.
Manno, C., Morata, N., and Bellerby, R.: Effect of ocean acidification and temperature increase on the planktonic foraminifer Neogloboquadrina pachyderma (sinistral), Polar Biol., 35, 1311–1319, https://doi.org/10.1007/s00300-012-1174-7, 2012.
Marino, G., Rohling, E. J., Rijpstra, W. I. C., Sangiorgi, F., Schouten, S., and Damsté, J. S. S.: Aegean Sea as driver of hydrographic and ecological changes in the Eastern Mediterranean, Geology, 35, 675–678, https://doi.org/10.1130/G23831A.1, 2007.
Marshall, B. J., Thunell, R. C., Henehan, M. H., Astor, Y., and Wejnert, K. R.: Planktonic foraminiferal area density as a proxy for carbonate ion concentration: A calibration study using the Cariaco Basin Ocean Time Series, Paleoceanography, 28, 1–14, https://doi.org/10.1002/palo.20034, 2013.
Media Cybernetics, Inc.: Image-Pro\textsuperscript\textregistered Plus Version 6.0 for Windows\textsuperscript\texttrademark Start-Up Guide, Silver-Spring, 2006.
Moller, T.: Formation and palaeoclimatic interpretation of a continuously laminated Sapropel S$_5$: A window to the climate variability during the Eemian interglacial in the Eastern Mediterranean, Ph.D. thesis, Eberhard–Karls-Universität Tübingen, Tübingen, http://nbn-resolving.de/urn:nbn:de:bsz:21-opus-63524, 2012.
Moller, T., Schulz, H., Hamann, Y., Dellwig, O., and Kučera, M.: Sedimentology and geochemistry of an exceptionally preserved last interglacial Sapropel S5 in the Levantine Basin (Mediterranean Sea), Mar. Geol., 291–294, 34–48, https://doi.org/10.1016/j.margeo.2011.10.011, 2012.
Morard, R., Quillévéré, F., Douady, C. J., de Vargas, C., de Garidel-Thoron, T., and Escarguel, G.: Worldwide genotyping in the planktonic foraminifer Globoconella inflata: Implications for life history and paleoceanography, PLoS ONE, 6, e26665, https://doi.org/10.1371/journal.pone.0026665, 2011.
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, https://doi.org/10.1038/NGEO460, 2009.
Myers, P. G., Haines, K., and Rohling, E. J.: Modeling the palecocirculation of the Mediterranean: The last glacial maximum and the Holocene with emphasis on the formation of Sapropel S$_1$, Paleoceanography, 13, 586–606, https://doi.org/10.1029/98PA02736, 1998.
Pearson, P. N., Ditchfield, P. W., Singano, J., Harcourt-Brown, K. G., Nicholas, C. J., Olsson, R. K., Shackleton, N. J., and Hall, M. A.: Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs, Nature, 413, 481–487, https://doi.org/10.1038/35097000, 2001.
Pujol, C. and Vergnaud Grazzini, C.: Distribution patterns of live planktic foraminifers as related to regional hydrography and productive systems of the Mediterranean Sea, Mar. Micropaleontol., 25, 187–217, https://doi.org/10.1016/0377-8398(95)00002-I, 1995.
R Development Core Team: R: A Language and Environment for Statistical Computing, R Foundation for Statistical Computing, Vienna, http://www.R-project.org/, 2011.
Rinna, J., Warning, B., Meyers, P. A., Brumsack, H.-J., and Rullkötter, J.: Combined organic and inorganic geochemical reconstruction of paleodepositional conditions of a Pliocene sapropel from the Eastern Mediterranean Sea, Geochim. Cosmochim. Ac., 66, 1969–1986, https://doi.org/10.1016/S0016-7037(02)00826-8, 2002.
Rohling, E., Abu-Zied, R., Casford, J., Hayes, A., and Hoogakker, B.: The marine environment: Present and past, in: The Physical Geography of the Mediterranean, edited by: Woodward, J., The Oxford Regional Environments Series, chap. 2, 33–67, Oxford University Press, New York, 2009.
Rohling, E. J.: Environmental control on Mediterranean salinity and δ18O, Paleoceanography, 14, 706–715, https://doi.org/10.1029/1999PA900042, 1999.
Rohling, E. J., de Rijk, S., Myers, P. G., and Haines, K.: Palaeoceanography and numerical modelling: The Mediterranean Sea at times of sapropel formation, in: Climates: Past and Present, edited by: Hart, M. B., vol. 181 of Special Publications of the Geological Society, 135–149, Geological Society, London, https://doi.org/10.1144/GSL.SP.2000.181.01.13, 2000.
Rohling, E. J., Cane, T. R., Cooke, S., Sprovieri, M., Bouloubassi, I., Emeis, K.-C., Schiebel, R., Kroon, D., Jorissen, F. J., Lorre, A., and Kemp, A. E. S.: African monsoon variability during the previous interglacial maximum, Earth Planet. Sc. Lett., 202, 61–75, https://doi.org/10.1016/S0012-821X(02)00775-6, 2002.
Rohling, E. J., Sprovieri, M., Cane, T., Casford, J. S. L., Cooke, S., Bouloubassi, I., Emeis, K.-C., Schiebel, R., Rogerson, M., Hayes, A., Jorissen, F. J., and Kroon, D.: Reconstructing past planktic foraminiferal habitats using stable isotope data: A case history for Mediterranean Sapropel S5, Mar. Micropaleontol., 50, 89–123, https://doi.org/10.1016/S0377-8398(03)00068-9, 2004.
Rossignol-Strick, M.: African monsoons, an immediate climate response to orbital insolation, Nature, 304, 46–49, https://doi.org/10.1038/304046a0, 1983.
Rossignol-Strick, M., Nesteroff, W., Olive, P., and Vergnaud Grazzini, C.: After the deluge: Mediterranean stagnation and sapropel formation, Nature, 295, 105–110, https://doi.org/10.1038/295105a0, 1982.
Schiebel, R., Waniek, J., Zeltner, A., and Alves, M.: Impact of the Azores Front on the distribution of planktic foraminifers, shelled gastropods, and coccolithophorids, Deep-Sea Res. Pt. II, 49, 4035–4050, https://doi.org/10.1016/S0967-0645(02)00141-8, 2002.
Schindelin, J., Arganda-Carreras, I., Frise, E., Kaynig, V., Longair, M., Pietzsch, T., Preibisch, S., Rueden, C., Saalfeld, S., Schmid, B., Tinevez, J.-Y., White, D. J., Hartenstein, V., Eliceiri, K., Tomancak, P., and Cardona, A.: Fiji: An open-source platform for biological-image analysis, Nat. Methods, 9, 676–682, https://doi.org/10.1038/nmeth.2019, 2012.
Schmidt, D. N., Renaud, S., Bollmann, J., Schiebel, R., and Thierstein, H. R.: Size distribution of Holocene planktic foraminifer assemblages: Biogeography, ecology and adaptation, Mar. Micropaleontol., 50, 319–338, https://doi.org/10.1016/S0377-8398(03)00098-7, 2004.
Schneider, A., Wallace, D. W. R., and Körtzinger, A.: Alkalinity of the Mediterranean Sea, Geophys. Res. Lett., 34, L15608, https://doi.org/10.1029/2006GL028842, 2007.
Schulz, H., Bayer, M., Denker, C., Hemleben, C., Martínez Botí, M., Numberger, L. D., Palamenghi, L., Storz, D., and van Raden, U.: Cruise Report – Cruise No.: 334, F. S. Poseidon Cruise Reports, Leibniz-Institut für Meereswissenschaften an der Universität Kiel, Kiel, 2006.
Seiter, K., Hensen, C., and Zabel, M.: Benthic carbon mineralization on a global scale. Global Biogeochem. Cy., 19, GB1010, https://doi.org/10.1029/2004GB002225, 2005.
Sen, P. K.: Estimates of the regression coefficient based on Kendall's Tau, J. Am. Stat. Assoc., 63, 1379–1389, http://www.jstor.org/stable/2285891, 1968.
Shapiro, S. S. and Wilk, M. B.: An analysis of variance test for normality (complete samples), Biometrika, 52, 591–611, https://doi.org/10.1093/biomet/52.3-4.591, 1965.
Theil, H.: A rank-invariant method of linear and polynomial regression analysis, III, P. K. Ned. Akad. Wetensc., 53, 1397–1412, 1950.
Trask, P. D.: Relation of salinity to the calcium carbonate content of marine sediments, in: Shorter Contributions to General Geology, edited by: Ickes, H. I. and Mendenhall, W. C., vol. 186 of United States Geological Survey Professional Papers, 273–299, United States Government Printing Office, Washington, https://play.google.com/store/books/details?id=P0IRAAAAIAAJ&rdid=book-P0IRAAAAIAAJ&rdot=1, 1937.
van der Meer, M. T. J., Baas, M., Rijpstra, W. I. C., Marino, G., Rohling, E. J., Damsté, J. S. S., and Schouten, S.: Hydrogen isotopic compositions of long-chain alkenones record freshwater flooding of the Eastern Mediterranean at the onset of sapropel deposition, Earth Planet. Sc. Lett., 262, 594–600, https://doi.org/10.1016/j.epsl.2007.08.014, 2007.
van Raden, U. J., Groeneveld, J., Raitzsch, M., and Kučera, M.: Mg/Ca in the planktonic Foraminifera Globorotalia inflata and Globigerinoides bulloides from Western Mediterranean plankton tow and core top samples, Mar. Micropaleontol., 78, 101–112, https://doi.org/10.1016/j.marmicro.2010.11.002, 2011.
Vangel, M. G.: Confidence intervals for a normal coefficient of variation, Am. Stat., 50, 21–26, http://www.jstor.org/stable/2685039, 1996.
Williams, D. F., Thunell, R. C., and Kennett, J. P.: Periodic freshwater flooding and stagnation of the Eastern Mediterranean Sea during the late Quaternary, Science, 201, 252–254, https://doi.org/10.1126/science.201.4352.252, 1978.
Wüst, G.: On the vertical circulation of the Mediterranean Sea, J. Geophys. Res., 66, 3261–3271, https://doi.org/10.1029/JZ066i010p03261, 1961.
Yates, F.: Contingency tables involving small numbers and the $\chi^2$ Test, J. Roy. Stat. Soc. Supp., 1, 217–235, http://www.jstor.org/stable/2983604, 1934.
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