Articles | Volume 16, issue 16
https://doi.org/10.5194/bg-16-3183-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-3183-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Aug 2019
Research article |
| 27 Aug 2019
| 27 Aug 2019
Identifying areas prone to coastal hypoxia – the role of topography
Elina A. Virtanen
CORRESPONDING AUTHOR
Marine Research Centre, Finnish Environment Institute, Helsinki,
00790, Finland
Department of Geosciences and Geography, University of Helsinki,
Helsinki, 00014, Finland
Alf Norkko
Tvärminne Zoological Station, University of Helsinki, Hanko,
10900, Finland
Baltic Sea Centre, Stockholm University, Stockholm, 10691, Sweden
Antonia Nyström Sandman
AquaBiota Water Research, Stockholm, 11550, Sweden
Markku Viitasalo
Marine Research Centre, Finnish Environment Institute, Helsinki,
00790, Finland
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Roseline C. Thakur, Lubna Dada, Lisa J. Beck, Lauriane L. J. Quéléver, Tommy Chan, Marjan Marbouti, Xu-Cheng He, Carlton Xavier, Juha Sulo, Janne Lampilahti, Markus Lampimäki, Yee Jun Tham, Nina Sarnela, Katrianne Lehtipalo, Alf Norkko, Markku Kulmala, Mikko Sipilä, and Tuija Jokinen
Atmos. Chem. Phys., 22, 6365–6391, https://doi.org/10.5194/acp-22-6365-2022, https://doi.org/10.5194/acp-22-6365-2022, 2022
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Every year intense cyanobacterial and macroalgal blooms occur in the Baltic Sea and in the coastal areas surrounding Helsinki, yet no studies have addressed the impact of biogenic emissions from these blooms on gas vapor concentrations, which in turn could influence new particle formation. This is the first study of its kind to address the chemistry driving new particle formation (NPF) during a bloom period in this region, highlighting the role of biogenic sulfuric acid and iodic acid.
Martin Jakobsson, Matt O'Regan, Carl-Magnus Mörth, Christian Stranne, Elizabeth Weidner, Jim Hansson, Richard Gyllencreutz, Christoph Humborg, Tina Elfwing, Alf Norkko, Joanna Norkko, Björn Nilsson, and Arne Sjöström
Earth Surf. Dynam., 8, 1–15, https://doi.org/10.5194/esurf-8-1-2020, https://doi.org/10.5194/esurf-8-1-2020, 2020
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We studied coastal sea floor terraces in parts of the Baltic Sea using various types of sonar data, sediment cores, and video. Terraces (~1 m high, > 100 m long) are widespread in depths < 15 m and are formed in glacial clay. Our study supports an origin from groundwater flow through silty layers, undermining overlying layers when discharged at the sea floor. Submarine groundwater discharge like this may be a significant source of freshwater to the Baltic Sea that needs to be studied further.
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Biogeosciences, 20, 3683–3716, https://doi.org/10.5194/bg-20-3683-2023, https://doi.org/10.5194/bg-20-3683-2023, 2023
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Arianna Zampollo, Thomas Cornulier, Rory O'Hara Murray, Jacqueline Fiona Tweddle, James Dunning, and Beth E. Scott
Biogeosciences, 20, 3593–3611, https://doi.org/10.5194/bg-20-3593-2023, https://doi.org/10.5194/bg-20-3593-2023, 2023
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We investigated how different deep water chemistry and biology modulate the response of surface phytoplankton communities to upwelling in the Peruvian coastal zone. Our results show that the most influential drivers were the ratio of inorganic nutrients (N : P) and the microbial community present in upwelling source water. These led to unexpected and variable development in the phytoplankton assemblage that could not be predicted by the amount of inorganic nutrients alone.
Hanna M. Kauko, Philipp Assmy, Ilka Peeken, Magdalena Różańska-Pluta, Józef M. Wiktor, Gunnar Bratbak, Asmita Singh, Thomas J. Ryan-Keogh, and Sebastien Moreau
Biogeosciences, 19, 5449–5482, https://doi.org/10.5194/bg-19-5449-2022, https://doi.org/10.5194/bg-19-5449-2022, 2022
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Chloe Carbonne, Steeve Comeau, Phoebe T. W. Chan, Keyla Plichon, Jean-Pierre Gattuso, and Núria Teixidó
Biogeosciences, 19, 4767–4777, https://doi.org/10.5194/bg-19-4767-2022, https://doi.org/10.5194/bg-19-4767-2022, 2022
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For the first time, our study highlights the synergistic effects of a 9-month warming and acidification combined stress on the early life stages of a Mediterranean azooxanthellate coral, Astroides calycularis. Our results predict a decrease in dispersion, settlement, post-settlement linear extention, budding and survival under future global change and that larvae and recruits of A. calycularis are stages of interest for this Mediterranean coral resistance, resilience and conservation.
Iris E. Hendriks, Anna Escolano-Moltó, Susana Flecha, Raquel Vaquer-Sunyer, Marlene Wesselmann, and Núria Marbà
Biogeosciences, 19, 4619–4637, https://doi.org/10.5194/bg-19-4619-2022, https://doi.org/10.5194/bg-19-4619-2022, 2022
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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 and published data showing that two Mediterranean seagrass species have different metabolic rates, while the study method influences the rates of the measurements. Most communities act as carbon sinks, while the western basin might be more productive than the eastern Mediterranean.
Raúl Tapia, Sze Ling Ho, Hui-Yu Wang, Jeroen Groeneveld, and Mahyar Mohtadi
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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We report census counts of planktic foraminifera in depth-stratified plankton net samples off Indonesia. Our results show that the vertical distribution of foraminifera species routinely used in paleoceanographic reconstructions varies in hydrographically distinct regions, likely in response to food availability. Consequently, the thermal gradient based on mixed layer and thermocline dwellers also differs for these regions, suggesting potential implications for paleoceanographic reconstructions.
Ricardo González-Gil, Neil S. Banas, Eileen Bresnan, and Michael R. Heath
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.
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.
Cited articles
Alenius, P., Myrberg, K., Roiha, P., Lips, U., Tuomi, L., Pettersson,
H., and Raateoja, M.: Gulf of Finland Physics, in: The Gulf of Finland assessment, edited by: Raateoja, M. and Setälä, O., Helsinki, Finnish Environment Institute, Reports of the Finnish Environment Institute, 27, 42–57, 2016.
Altieri, A. H. and Gedan, K. B.: Climate change and dead zones, Glob.
Change Biol., 21, 1395–1406, https://doi.org/10.1111/gcb.12754, 2015.
Ashcroft, M. B., Chisholm, L. A., and French, K. O.: The effect of exposure
on landscape scale soil surface temperatures and species distribution
models, Landscape Ecol., 23, 211–225, https://doi.org/10.1007/s10980-007-9181-8, 2008.
Bekkby, T., Isachsen, P. E., Isaeus, M., and Bakkestuen, V.: GIS modeling of
wave exposure at the seabed: A depth-attenuated wave exposure model, Mar.
Geod., 31, 117–127, https://doi.org/10.1080/01490410802053674, 2008.
Greenwell, B., Boehmke, B., Cunningham, J., and GBM Developers:
gbm: Generalized Boosted Regression Models, R package version
2.1.4, available at: https://CRAN.R-project.org/package=gbm (last access: 11 March 2019), 2018.
Breitburg, D., Levin, L. A., Oschlies, A., Grégoire, M., Chavez, F. P.,
Conley, D. J., Garçon, V., Gilbert, D., Gutiérrez, D., Isensee, K.,
Jacinto, G. S., Limburg, K. E., Montes, I., Naqvi, S. W. A., Pitcher, G. C.,
Rabalais, N. N., Roman, M. R., Rose, K. A., Seibel, B. A., Telszewski, M.,
Yasuhara, M., and Zhang, J.: Declining oxygen in the global ocean and
coastal waters, Science, 359, 1–11, https://doi.org/10.1126/science.aam7240, 2018.
Buzzelli, C. P., Luettich Jr, R. A., Powers, S. P., Peterson, C. H.,
McNinch, J. E., Pinckney, J. L., and Paerl, H. W.: Estimating the spatial
extent of bottom-water hypoxia and habitat degradation in a shallow estuary,
Mar. Ecol. Prog. Ser., 230, 103–112, 2002.
Caballero-Alfonso, A. M., Carstensen, J., and Conley, D. J.: Biogeochemical
and environmental drivers of coastal hypoxia, J. Mar. Syst.,
141, 190–199, https://doi.org/10.1016/j.jmarsys.2014.04.008, 2015.
Carstensen, J., Andersen, J. H., Gustafsson, B. G., and Conley, D. J.:
Deoxygenation of the Baltic Sea during the last century, P.
Natl. Acad. Sci. USA, 111, 5628–5633, https://doi.org/10.1073/pnas.1323156111, 2014.
Conley, D. J., Humborg, C., Rahm, L., Savchuk, O. P., and Wulff, F.: Hypoxia
in the Baltic Sea and basin-scale changes in phosphorus biogeochemistry,
Environ. Sci. Technol., 36, 5315–5320, https://doi.org/10.1021/es025763w,
2002.
Conley, D. J., Björck, S., Bonsdorff, E., Carstensen, J., Destouni, G.,
Gustafsson, B. G., Hietanen, S., Kortekaas, M., Kuosa, H., Markus Meier, H.
E., Müller-Karulis, B., Nordberg, K., Norkko, A., Nürnberg, G.,
Pitkänen, H., Rabalais, N. N., Rosenberg, R., Savchuk, O. P., Slomp, C.
P., Voss, M., Wulff, F., and Zillén, L.: Hypoxia-Related Processes in
the Baltic Sea, Environ. Sci. Technol., 43, 3412–3420,
https://doi.org/10.1021/es802762a, 2009.
Conley, D. J., Carstensen, J., Aigars, J., Axe, P., Bonsdorff, E., Eremina,
T., Haahti, B. M., Humborg, C., Jonsson, P., Kotta, J., Lannegren, C.,
Larsson, U., Maximov, A., Medina, M. R., Lysiak-Pastuszak, E.,
Remeikaite-Nikiene, N., Walve, J., Wilhelms, S., and Zillen, L.: Hypoxia Is
Increasing in the Coastal Zone of the Baltic Sea, Environ. Sci.
Technol., 45, 6777–6783, https://doi.org/10.1021/es201212r, 2011.
De'ath, G. and Fabricius, K. E.: Classification and regression trees: A
powerful yet simple technique for ecological data analysis, Ecology, 81,
3178–3192, https://doi.org/10.1890/0012-9658(2000)081[3178:CARTAP]2.0.CO;2, 2000.
Diaz, R. and Rosenberg, R.: Marine benthic hypoxia: A review of its
ecological effects and the behavioural response of benthic macrofauna, Oceanogr. Mar. Biol., 33,
245–303, 1995a.
Diaz, R. J. and Rosenberg, R.: Marine benthic hypoxia: A review of its
ecological effects and the behavioural responses of benthic macrofauna, in:
Oceanography and Marine Biology – an Annual Review, Vol. 33, edited by:
Ansell, A. D., Gibson, R. N., and Barnes, M., Oceanography and Marine
Biology, U. C. L. Press Ltd, London, 245–303, 1995b.
Diaz, R. J. and Rosenberg, R.: Spreading dead zones and consequences for
marine ecosystems, Science, 321, 926–929, https://doi.org/10.1126/science.1156401, 2008.
Dunn, D. C. and Halpin, P. N.: Rugosity-based regional modeling of
hard-bottom habitat, Mar. Ecol. Prog. Ser., 377, 1–11, 2009.
Du Preez, C.: A new arc–chord ratio (ACR) rugosity index for quantifying
three-dimensional landscape structural complexity, Landscape Ecol., 30,
181–192, https://doi.org/10.1007/s10980-014-0118-8, 2015.
Eilola, K., Meier, H. E. M., and Almroth, E.: On the dynamics of oxygen,
phosphorus and cyanobacteria in the Baltic Sea; A model study, J.
Mar. Syst., 75, 163–184, https://doi.org/10.1016/j.jmarsys.2008.08.009,
2009.
Eilola, K., Gustafsson, B. G., Kuznetsov, I., Meier, H. E. M., Neumann, T.,
and Savchuk, O. P.: Evaluation of biogeochemical cycles in an ensemble of
three state-of-the-art numerical models of the Baltic Sea, J. Mar.
Syst., 88, 267–284, https://doi.org/10.1016/j.jmarsys.2011.05.004, 2011.
Elith, J., Leathwick, J. R., and Hastie, T.: A working guide to boosted
regression trees, J. Anim. Ecol., 77, 802–813,
https://doi.org/10.1111/j.1365-2656.2008.01390.x, 2008.
Eriksson, S. P., Wennhage, H., Norkko, J., and Norkko, A.: Episodic
disturbance events modify predator-prey interactions in soft sediments,
Estuar. Coast. Shelf S., 64, 289–294,
https://doi.org/10.1016/j.ecss.2005.02.022, 2005.
Fennel, K. and Testa, J. M.: Biogeochemical Controls on Coastal Hypoxia,
Annu. Rev. Mar. Sci., 11, 105–130,
https://doi.org/10.1146/annurev-marine-010318-095138, 2019.
Fennel, K., Hetland, R., Feng, Y., and DiMarco, S.: A coupled physical-biological model of the Northern Gulf of Mexico shelf: model description, validation and analysis of phytoplankton variability, Biogeosciences, 8, 1881–1899, https://doi.org/10.5194/bg-8-1881-2011, 2011.
Fennel, K., Laurent, A., Hetland, R., Justic, D., Ko, D. S., Lehrter, J.,
Murrell, M., Wang, L. X., Yu, L. Q., and Zhang, W. X.: Effects of model
physics on hypoxia simulations for the northern Gulf of Mexico: A model
intercomparison, J. Geophys. Res.-Ocean., 121, 5731–5750,
https://doi.org/10.1002/2015jc011577, 2016.
Freeman, E. A. and Moisen, G.: PresenceAbsence: An R Package for
Presence-Absence Model Analysis, J. Stat. Softw., 23, 1–31,
2008.
Frölicher, T. L., Joos, F., Plattner, G. K., Steinacher, M., and Doney,
S. C.: Natural variability and anthropogenic trends in oceanic oxygen in a
coupled carbon cycle–climate model ensemble, Global Biogeochem. Cy.,
23, 1–15, https://doi.org/10.1029/2008GB003316, 2009.
Gammal, J., Norkko, J., Pilditch, C. A., and Norkko, A.: Coastal Hypoxia and
the Importance of Benthic Macrofauna Communities for Ecosystem Functioning,
Estuar. Coast., 40, 457–468, https://doi.org/10.1007/s12237-016-0152-7, 2017.
Gilbert, D., Rabalais, N. N., Díaz, R. J., and Zhang, J.: Evidence for greater oxygen decline rates in the coastal ocean than in the open ocean, Biogeosciences, 7, 2283–2296, https://doi.org/10.5194/bg-7-2283-2010, 2010.
Gray, J. S., Wu, R. S. S., and Or, Y. Y.: Effects of hypoxia and organic
enrichment on the coastal marine environment, Mar. Ecol. Prog.
Ser., 238, 249–279, https://doi.org/10.3354/meps238249, 2002.
Gregorutti, B., Michel, B., and Saint-Pierre, P.: Correlation and variable
importance in random forests, Stat. Comput., 27, 659–678,
https://doi.org/10.1007/s11222-016-9646-1, 2017.
Hastie, T., Tibshirani, R., and Friedman, J. H.: The Elements of Statistical
Learning: Data Mining, Inference, and Prediction, Springer-Verlag, New
York, 2001.
HELCOM: Sources and pathways of nutrients to the Baltic Sea,
Baltic Sea Environment Proceedings No. 153, 1–48, 2018.
Hordoir, R., Axell, L., Höglund, A., Dieterich, C., Fransner, F., Gröger, M., Liu, Y., Pemberton, P., Schimanke, S., Andersson, H., Ljungemyr, P., Nygren, P., Falahat, S., Nord, A., Jönsson, A., Lake, I., Döös, K., Hieronymus, M., Dietze, H., Löptien, U., Kuznetsov, I., Westerlund, A., Tuomi, L., and Haapala, J.: Nemo-Nordic 1.0: a NEMO-based ocean model for the Baltic and North seas – research and operational applications, Geosci. Model Dev., 12, 363–386, https://doi.org/10.5194/gmd-12-363-2019, 2019.
Jiménez-Valverde, A. and Lobo, J. M.: Threshold criteria for conversion
of probability of species presence to either–or presence–absence, Acta
Oecol., 31, 361–369, https://doi.org/10.1016/j.actao.2007.02.001, 2007.
Jokinen, S. A., Virtasalo, J. J., Jilbert, T., Kaiser, J., Dellwig, O., Arz, H. W., Hänninen, J., Arppe, L., Collander, M., and Saarinen, T.: A 1500-year multiproxy record of coastal hypoxia from the northern Baltic Sea indicates unprecedented deoxygenation over the 20th century, Biogeosciences, 15, 3975–4001, https://doi.org/10.5194/bg-15-3975-2018, 2018.
Karlson, K., Rosenberg, R., and Bonsdorff, E.: Temporal and spatial
large-scale effects of eutrophication and oxygen deficiency on benthic fauna
in Scandinavian and Baltic waters – A review, in: Oceanography and Marine
Biology, Vol. 40, edited by: Gibson, R. N., Barnes, M., and Atkinson, R. J.
A., Oceanography and Marine Biology, Taylor & Francis Ltd, London,
427–489, 2002.
Karlsson, O. M., Jonsson, P. O., Lindgren, D., Malmaeus, J. M., and Stehn,
A.: Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago,
Ambio, 39, 486–495, https://doi.org/10.1007/s13280-010-0079-3, 2010.
Kaskela, A. M., Kotilainen, A. T., Al-Hamdani, Z., Leth, J. O., and Reker,
J.: Seabed geomorphic features in a glaciated shelf of the Baltic Sea,
Estuar. Coast. Shelf S., 100, 150–161,
https://doi.org/10.1016/j.ecss.2012.01.008, 2012.
Kemp, W. M., Testa, J. M., Conley, D. J., Gilbert, D., and Hagy, J. D.: Temporal responses of coastal hypoxia to nutrient loading and physical controls, Biogeosciences, 6, 2985–3008, https://doi.org/10.5194/bg-6-2985-2009, 2009.
Kramer, M. G., Hansen, A. J., Taper, M. L., and Kissinger, E. J.: Abiotic
controls on long-term windthrow disturbance and temperate rain forest
dynamics in Southeast Alaska, Ecology, 10, 2749–2768 2001.
Laine, A. O., Sandler, H., Andersin, A.-B., and Stigzelius, J.: Long-term
changes of macrozoobenthos in the Eastern Gotland Basin and the Gulf of
Finland (Baltic Sea) in relation to the hydrographical regime, J.
Sea Res., 38, 135–159, https://doi.org/10.1016/S1385-1101(97)00034-8,
1997.
Lappalainen, J., Virtanen, E. A., Kallio, K., Junttila, S., and Viitasalo,
M.: Substrate limitation of a habitat-forming genus Fucus under different
water clarity scenarios in the northern Baltic Sea, Estuarine, Coast.
Shelf Sci., 218, 31–38, https://doi.org/10.1016/j.ecss.2018.11.010, 2019.
Leppäranta, M. and Myrberg, K.: Physical Oceanography of the Baltic
Sea, Springer-Verlag, Berlin-Heidelberg-New York, 131–187, 2009.
Liu, C., Berry, P. M., Dawson, T. P., and Pearson, R. G.: Selecting
thresholds of occurrence in the prediction of species distributions,
Ecography, 28, 385–393, https://doi.org/10.1111/j.0906-7590.2005.03957.x, 2005.
Meier, H. E. M., Andersson, H. C., Eilola, K., Gustafsson, B. G., Kuznetsov,
I., Müller-Karulis, B., Neumann, T., and Savchuk, O. P.: Hypoxia in
future climates: A model ensemble study for the Baltic Sea, Geophys.
Res. Lett., 38, 1–6, https://doi.org/10.1029/2011GL049929, 2011a.
Meier, H. E. M., Eilola, K., and Almroth, E.: Climate-related changes in
marine ecosystems simulated with a 3-dimensional coupled
physicalbiogeochemical model of the Baltic Sea, Clim. Res., 48, 31–55,
2011b.
Meier, H. E. M., Hordoir, R., Andersson, H. C., Dieterich, C., Eilola, K.,
Gustafsson, B. G., Hoglund, A., and Schimanke, S.: Modeling the combined
impact of changing climate and changing nutrient loads on the Baltic Sea
environment in an ensemble of transient simulations for 1961–2099, Clim.
Dynam., 39, 2421–2441, https://doi.org/10.1007/s00382-012-1339-7, 2012a.
Meier, H. E. M., Muller-Karulis, B., Andersson, H. C., Dieterich, C.,
Eilola, K., Gustafsson, B. G., Hoglund, A., Hordoir, R., Kuznetsov, I.,
Neumann, T., Ranjbar, Z., Savchuk, O. P., and Schimanke, S.: Impact of
Climate Change on Ecological Quality Indicators and Biogeochemical Fluxes in
the Baltic Sea: A Multi-Model Ensemble Study, Ambio, 41, 558–573,
https://doi.org/10.1007/s13280-012-0320-3, 2012b.
Meier, H. E. M., Andersson, H. C., Arheimer, B., Donnelly, C., Eilola, K.,
Gustafsson, B. G., Kotwicki, L., Neset, T.-S., Niiranen, S., Piwowarczyk,
J., Savchuk, O. P., Schenk, F., Węsławski, J. M., and Zorita, E.:
Ensemble Modeling of the Baltic Sea Ecosystem to Provide Scenarios for
Management, Ambio, 43, 37–48, https://doi.org/10.1007/s13280-013-0475-6, 2014.
Middelburg, J. J. and Levin, L. A.: Coastal hypoxia and sediment biogeochemistry, Biogeosciences, 6, 1273–1293, https://doi.org/10.5194/bg-6-1273-2009, 2009.
Natekin, A. and Knoll, A.: Gradient boosting machines, a tutorial,
Front. Neurorobotics, 7, 1–21, https://doi.org/10.3389/fnbot.2013.00021, 2013.
Nilsson, H. C. and Rosenberg, R.: Succession in marine benthic habitats and
fauna in response to oxygen deficiency: analysed by sediment profile-imaging
and by grab samples, Mar. Ecol. Prog. Ser., 197, 139–149,
https://doi.org/10.3354/meps197139, 2000.
Norkko, J., Reed, D. C., Timmermann, K., Norkko, A., Gustafsson, B. G.,
Bonsdorff, E., Slomp, C. P., Carstensen, J., and Conley, D. J.: A welcome
can of worms? Hypoxia mitigation by an invasive species, Glob. Change
Biol., 18, 422–434, https://doi.org/10.1111/j.1365-2486.2011.02513.x, 2012.
Norkko, J., Gammal, J., Hewitt, J. E., Josefson, A. B., Carstensen, J., and
Norkko, A.: Seafloor Ecosystem Function Relationships: In Situ Patterns of
Change Across Gradients of Increasing Hypoxic Stress, Ecosystems, 18,
1424–1439, https://doi.org/10.1007/s10021-015-9909-2, 2015.
Pitkänen, H., Lehtoranta, J., and Räike, A.: Internal Nutrient
Fluxes Counteract Decreases in External Load: The Case of the Estuarial
Eastern Gulf of Finland, Baltic Sea, 30, 195–201, 2001.
Puttonen, I., Mattila, J., Jonsson, P., Karlsson, O. M., Kohonen, T.,
Kotilainen, A., Lukkari, K., Malmaeus, J. M., and Rydin, E.: Distribution
and estimated release of sediment phosphorus in the northern Baltic Sea
archipelagos, Estuarine, Coast. Shelf Sci., 145, 9–21,
https://doi.org/10.1016/j.ecss.2014.04.010, 2014.
R Core Team: R: A language and environment for statistical computing. , R
foundation for Statisticl a Computing, Vienna, Austria, available at: https://www.R-project.org/ (last access: 7 April 2019), 2018.
Rabalais, N. N., Díaz, R. J., Levin, L. A., Turner, R. E., Gilbert, D., and Zhang, J.: Dynamics and distribution of natural and human-caused hypoxia, Biogeosciences, 7, 585–619, https://doi.org/10.5194/bg-7-585-2010, 2010.
Sappington, J. M., Longshore, K. M., and Thompson, D. B.: Quantifying
Landscape Ruggedness for Animal Habitat Analysis: A Case Study Using Bighorn
Sheep in the Mojave Desert, SPIE, 8 pp., 2007.
Schapire, R.: The boosting approach to machine learning – an overview, in:
MSRI Workshop on Nonlinear Estimation and Classification, 2002, edited by:
Denison, D., Hansen, M. H., Holmes, C., B., M., and B., Y., Springer, New
York, 2003.
Scully, M. E.: Physical controls on hypoxia in Chesapeake Bay: A numerical
modeling study, J. Geophys. Res.-Ocean., 118, 1239–1256,
https://doi.org/10.1002/jgrc.20138, 2013.
Scully, M. E.: The contribution of physical processes to inter-annual
variations of hypoxia in Chesapeake Bay: A 30-yr modeling study, Limnol.
Oceanogr., 61, 2243–2260, https://doi.org/10.1002/lno.10372, 2016.
Stramma, L., Oschlies, A., and Schmidtko, S.: Mismatch between observed and modeled trends in dissolved upper-ocean oxygen over the last 50 yr, Biogeosciences, 9, 4045–4057, https://doi.org/10.5194/bg-9-4045-2012, 2012.
Testa, J. M., Li, Y., Lee, Y. J., Li, M., Brady, D. C., Di Toro, D. M.,
Kemp, W. M., and Fitzpatrick, J. J.: Quantifying the effects of nutrient
loading on dissolved O-2 cycling and hypoxia in Chesapeake Bay using a
coupled hydrodynamic-biogeochemical model, J. Mar. Syst., 139,
139–158, https://doi.org/10.1016/j.jmarsys.2014.05.018, 2014.
Timmermann, K., Norkko, J., Janas, U., Norkko, A., Gustafsson, B. G., and
Bonsdorff, E.: Modelling macrofaunal biomass in relation to hypoxia and
nutrient loading, J. Mar. Syst., 105, 60–69,
https://doi.org/10.1016/j.jmarsys.2012.06.001, 2012.
Vahtera, E., Conley, D. J., Gustafsson, B. G., Kuosa, H., Pitkanen, H.,
Savchuk, O. P., Tamminen, T., Viitasalo, M., Voss, M., Wasmund, N., and
Wulff, F.: Internal ecosystem feedbacks enhance nitrogen-fixing
cyanobacteria blooms and complicate management in the Baltic Sea, Ambio, 36,
186–194, https://doi.org/10.1579/0044-7447(2007)36[186:iefenc]2.0.co;2, 2007.
Valanko, S., Heino, J., Westerbom, M., Viitasalo, M., and Norkko, A.:
Complex metacommunity structure for benthic invertebrates in a low-diversity
coastal system, Ecol. Evol., 5, 5203–5215, https://doi.org/10.1002/ece3.1767,
2015.
van Helmond, N. A., Krupinski, N. B. Q., Lougheed, B. C., Obrochta, S. P.,
Andrén, T., and Slomp, C. P.: Seasonal hypoxia was a natural feature of
the coastal zone in the Little Belt, Denmark, during the past 8 ka, Mar.
Geol., 387, 45–57, 2017.
Vaquer-Sunyer, R. and Duarte, C. M.: Thresholds of hypoxia for marine
biodiversity, P. Natl. Acad. Sci. USA, 105, 15452–15457, https://doi.org/10.1073/pnas.0803833105, 2008.
Villnas, A., Norkko, J., Lukkari, K., Hewitt, J., and Norkko, A.:
Consequences of Increasing Hypoxic Disturbance on Benthic Communities and
Ecosystem Functioning, Plos One, 7, 1–12, https://doi.org/10.1371/journal.pone.0044920, 2012.
Villnas, A., Norkko, J., Hietanen, S., Josefson, A. B., Lukkari, K., and
Norkko, A.: The role of recurrent disturbances for ecosystem
multifunctionality, Ecology, 94, 2275–2287, https://doi.org/10.1890/12-1716.1, 2013.
Virtanen, E. A., Viitasalo, M., Lappalainen, J., and Moilanen, A.:
Evaluation, Gap Analysis, and Potential Expansion of the Finnish Marine
Protected Area Network, Front. Mar. Sci., 5, 1–19,
https://doi.org/10.3389/fmars.2018.00402, 2018.
Virtanen, E. A., Norkko, A., Nyström Sandman, A., and Viitasalo, M.: Data from: Identifying areas prone to coastal hypoxia – the role of topography, Dryad Digital Repository, https://doi.org/10.5061/dryad.cn5kh5m, 2019.
Virtasalo, J. J., Kohonen, T., Vuorinen, I., and Huttula, T.: Sea bottom
anoxia in the Archipelago Sea, northern Baltic Sea – Implications for
phosphorus remineralization at the sediment surface, Mar. Geol., 224,
103–122, https://doi.org/10.1016/j.margeo.2005.07.010, 2005.
Walbridge, S., Slocum, N., Pobuda, M., and Wright, D.: Unified
Geomorphological Analysis Workflows with Benthic Terrain Modeler,
Geosciences, 8, 1–24, 2018.
Walker, B. K., Jordan, L. K. B., and Spieler, R. E.: Relationship of Reef
Fish Assemblages and Topographic Complexity on Southeastern Florida Coral
Reef Habitats, SPIE, 10 pp., 2009.
Walve, J., Sandberg, M., Larsson, U., and Lännergren, C.: A Baltic Sea estuary as a phosphorus source and sink after drastic load reduction: seasonal and long-term mass balances for the Stockholm inner archipelago for 1968–2015, Biogeosciences, 15, 3003–3025, https://doi.org/10.5194/bg-15-3003-2018, 2018.
Weiss, A. D.: Topographic position and landforms analysis, In Poster
presented at the Esri User Conference, San Diego, CA, USA, http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf (last access: 17 January 2019), 2001.
WFD: Water Framework Directive, Common Implementation, 2000.
Short summary
Our understanding of the drivers of hypoxia fundamentally hinges on patterns of water circulation and vertical mixing that can be difficult to resolve in coastal regions. We identified areas prone to oxygen loss in a complex marine area without knowledge of biogeochemical properties, using only parameters which describe the enclosed seafloors with restricted water exchange. Our approach could help nutrient abatement measures and pinpoint areas where management actions are most urgently needed.
Our understanding of the drivers of hypoxia fundamentally hinges on patterns of water...
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