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Volume 13, issue 22
Biogeosciences, 13, 6171–6182, 2016
https://doi.org/10.5194/bg-13-6171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-13-6171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue: Effects of rising CO2 on a Baltic Sea plankton...
Biogeosciences, 13, 6171–6182, 2016
https://doi.org/10.5194/bg-13-6171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-13-6171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article 15 Nov 2016
Research article | 15 Nov 2016
Ocean acidification challenges copepod phenotypic plasticity
Anu Vehmaa et al.Related authors
Anna-Karin Almén, Anu Vehmaa, Andreas Brutemark, Lennart Bach, Silke Lischka, Annegret Stuhr, Sara Furuhagen, Allanah Paul, J. Rafael Bermúdez, Ulf Riebesell, and Jonna Engström-Öst
Biogeosciences, 13, 1037–1048, https://doi.org/10.5194/bg-13-1037-2016, https://doi.org/10.5194/bg-13-1037-2016, 2016
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We studied the effects of ocean acidification (OA) on the aquatic crustacean Eurytemora affinis and measured offspring production in relation to pH, chlorophyll, algae, fatty acids, and oxidative stress. No effects on offspring production or pH effects via food were found. E. affinis seems robust against OA on a physiological level and did probably not face acute pH stress in the treatments, as the species naturally face large pH fluctuations.
Giulia Faucher, Ulf Riebesell, and Lennart Thomas Bach
Clim. Past Discuss., https://doi.org/10.5194/cp-2019-84, https://doi.org/10.5194/cp-2019-84, 2019
Manuscript under review for CP
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We designed 5 experiments choosing different coccolithophore species that have been evolutionarily distinct for millions of years. If all species showed the same morphological response to an environmental driver, this could be indicative of a response pattern which is conserved over geological timescales. We found an increase in the percentage of malformed coccoliths under altered CO2 that provides evidence that this response could be used as paleo-proxy for episodes of acute CO2 perturbations.
Yong Zhang, Lennart T. Bach, Kai T. Lohbeck, Kai G. Schulz, Luisa Listmann, Regina Klapper, and Ulf Riebesell
Biogeosciences, 15, 3691–3701, https://doi.org/10.5194/bg-15-3691-2018, https://doi.org/10.5194/bg-15-3691-2018, 2018
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To compare variations in physiological responses to pCO2 between populations, we measured growth, POC and PIC production rates at a pCO2 range from 120 to 2630 µatm for 17 strains of the coccolithophore Emiliania huxleyi from the Azores, Canary Islands, and Norwegian coast near Bergen. Optimal pCO2 for growth and POC production rates and tolerance to low pH was significantly higher for the Bergen population than the Azores and Canary Islands populations.
Katharine J. Crawfurd, Santiago Alvarez-Fernandez, Kristina D. A. Mojica, Ulf Riebesell, and Corina P. D. Brussaard
Biogeosciences, 14, 3831–3849, https://doi.org/10.5194/bg-14-3831-2017, https://doi.org/10.5194/bg-14-3831-2017, 2017
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Carbon dioxide (CO2) is increasing in the atmosphere and oceans. To simulate future conditions we manipulated CO2 concentrations of natural Baltic seawater in 55 m3 bags in situ. We saw increased growth rates and abundances of the smallest-sized eukaryotic phytoplankton and reduced abundances of other phytoplankton with increased CO2. Viral and bacterial abundances were also affected. This would lead to more carbon recycling in the surface water and affect marine food webs and the carbon cycle.
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.
Silke Lischka, Lennart T. Bach, Kai-Georg Schulz, and Ulf Riebesell
Biogeosciences, 14, 447–466, https://doi.org/10.5194/bg-14-447-2017, https://doi.org/10.5194/bg-14-447-2017, 2017
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We conducted a large-scale field experiment using 55 m3 floating containers (mesocosms) to investigate consequences of near-future projected CO2 elevations (ocean acidification) on a Baltic Sea plankton community in Storfjärden (Finland). The focus of our study was on single- and multicelled small-sized organisms dwelling in the water column. Our results suggest that increasing CO2 concentrations may change the species composition and promote specific food web interactions.
Enis Hrustić, Risto Lignell, Ulf Riebesell, and Tron Frede Thingstad
Biogeosciences, 14, 379–387, https://doi.org/10.5194/bg-14-379-2017, https://doi.org/10.5194/bg-14-379-2017, 2017
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Phytoplankton in the ocean's stratified layer are limited by mineral nutrients, normally nitrogen, phosphorus, or iron. It is important to know not only which element is limiting, but also the surplus of the secondary limiting element. We explore here, in temperate mesotrophic waters, a bioassay based on alkaline phosphatase that provides information on both of these.
Thomas Hornick, Lennart T. Bach, Katharine J. Crawfurd, Kristian Spilling, Eric P. Achterberg, Jason N. Woodhouse, Kai G. Schulz, Corina P. D. Brussaard, Ulf Riebesell, and Hans-Peter Grossart
Biogeosciences, 14, 1–15, https://doi.org/10.5194/bg-14-1-2017, https://doi.org/10.5194/bg-14-1-2017, 2017
Rafael Bermúdez, Monika Winder, Annegret Stuhr, Anna-Karin Almén, Jonna Engström-Öst, and Ulf Riebesell
Biogeosciences, 13, 6625–6635, https://doi.org/10.5194/bg-13-6625-2016, https://doi.org/10.5194/bg-13-6625-2016, 2016
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Increasing CO2 is changing seawater chemistry towards a lower pH, which affects marine organisms. We investigate the response of a brackish plankton community to a CO2 gradient in terms of structure and fatty acid composition. The structure was resilient to CO2 and did not diverge between treatments. FA was influenced by community structure, which was driven by silicate and phosphate. This suggests that CO2 effects are dampened in communities already experiencing high natural pCO2 fluctuation.
Kristian Spilling, Kai G. Schulz, Allanah J. Paul, Tim Boxhammer, Eric P. Achterberg, Thomas Hornick, Silke Lischka, Annegret Stuhr, Rafael Bermúdez, Jan Czerny, Kate Crawfurd, Corina P. D. Brussaard, Hans-Peter Grossart, and Ulf Riebesell
Biogeosciences, 13, 6081–6093, https://doi.org/10.5194/bg-13-6081-2016, https://doi.org/10.5194/bg-13-6081-2016, 2016
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We performed an experiment in the Baltic Sea in order to investigate the consequences of the increasing CO2 levels on biological processes in the free water mass. There was more accumulation of organic carbon at high CO2 levels. Surprisingly, this was caused by reduced loss processes (respiration and bacterial production) in a high-CO2 environment, and not by increased photosynthetic fixation of CO2. Our carbon budget can be used to better disentangle the effects of ocean acidification.
Kristian Spilling, Allanah J. Paul, Niklas Virkkala, Tom Hastings, Silke Lischka, Annegret Stuhr, Rafael Bermúdez, Jan Czerny, Tim Boxhammer, Kai G. Schulz, Andrea Ludwig, and Ulf Riebesell
Biogeosciences, 13, 4707–4719, https://doi.org/10.5194/bg-13-4707-2016, https://doi.org/10.5194/bg-13-4707-2016, 2016
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Anthropogenic carbon dioxide (CO2) emissions are reducing the pH in the world's oceans. We determined the plankton community composition and measured primary production, respiration rates and carbon export during an ocean acidification experiment. Our results suggest that increased CO2 reduced respiration and increased net carbon fixation at high CO2. This did not, however, translate into higher carbon export, and consequently did not work as a negative feedback mechanism for decreasing pH.
Juntian Xu, Lennart T. Bach, Kai G. Schulz, Wenyan Zhao, Kunshan Gao, and Ulf Riebesell
Biogeosciences, 13, 4637–4643, https://doi.org/10.5194/bg-13-4637-2016, https://doi.org/10.5194/bg-13-4637-2016, 2016
Alison L. Webb, Emma Leedham-Elvidge, Claire Hughes, Frances E. Hopkins, Gill Malin, Lennart T. Bach, Kai Schulz, Kate Crawfurd, Corina P. D. Brussaard, Annegret Stuhr, Ulf Riebesell, and Peter S. Liss
Biogeosciences, 13, 4595–4613, https://doi.org/10.5194/bg-13-4595-2016, https://doi.org/10.5194/bg-13-4595-2016, 2016
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This paper presents concentrations of several trace gases produced by the Baltic Sea phytoplankton community during a mesocosm experiment with five different CO2 levels. Average concentrations of dimethylsulphide were lower in the highest CO2 mesocosms over a 6-week period, corresponding to previous mesocosm experiment results. No dimethylsulfoniopropionate was detected due to a methodological issue. Concentrations of iodine- and bromine-containing halocarbons were unaffected by increasing CO2.
Allanah J. Paul, Eric P. Achterberg, Lennart T. Bach, Tim Boxhammer, Jan Czerny, Mathias Haunost, Kai-Georg Schulz, Annegret Stuhr, and Ulf Riebesell
Biogeosciences, 13, 3901–3913, https://doi.org/10.5194/bg-13-3901-2016, https://doi.org/10.5194/bg-13-3901-2016, 2016
Carolin R. Löscher, Hermann W. Bange, Ruth A. Schmitz, Cameron M. Callbeck, Anja Engel, Helena Hauss, Torsten Kanzow, Rainer Kiko, Gaute Lavik, Alexandra Loginova, Frank Melzner, Judith Meyer, Sven C. Neulinger, Markus Pahlow, Ulf Riebesell, Harald Schunck, Sören Thomsen, and Hannes Wagner
Biogeosciences, 13, 3585–3606, https://doi.org/10.5194/bg-13-3585-2016, https://doi.org/10.5194/bg-13-3585-2016, 2016
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The ocean loses oxygen due to climate change. Addressing this issue in tropical ocean regions (off Peru and Mauritania), we aimed to understand the effects of oxygen depletion on various aspects of marine biogeochemistry, including primary production and export production, the nitrogen cycle, greenhouse gas production, organic matter fluxes and remineralization, and the role of zooplankton and viruses.
Monika Nausch, Lennart Thomas Bach, Jan Czerny, Josephine Goldstein, Hans-Peter Grossart, Dana Hellemann, Thomas Hornick, Eric Pieter Achterberg, Kai-Georg Schulz, and Ulf Riebesell
Biogeosciences, 13, 3035–3050, https://doi.org/10.5194/bg-13-3035-2016, https://doi.org/10.5194/bg-13-3035-2016, 2016
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Studies investigating the effect of increasing CO2 levels on the phosphorus cycle in natural waters are lacking although phosphorus often controls phytoplankton development in aquatic systems. The aim of our study was to analyse effects of elevated CO2 levels on phosphorus pool sizes and uptake. Therefore, we conducted a CO2-manipulation mesocosm experiment in the Storfjärden (western Gulf of Finland, Baltic Sea) in summer 2012. We compared the phosphorus dynamics in different mesocosm treatment
Tim Boxhammer, Lennart T. Bach, Jan Czerny, and Ulf Riebesell
Biogeosciences, 13, 2849–2858, https://doi.org/10.5194/bg-13-2849-2016, https://doi.org/10.5194/bg-13-2849-2016, 2016
Silvia Pulina, Andreas Brutemark, Sanna Suikkanen, Bachisio M. Padedda, Lorena M. Grubisic, Cecilia T. Satta, Tiziana Caddeo, Pasqualina Farina, Nicola Sechi, and Antonella Lugliè
Web Ecol., 16, 89–92, https://doi.org/10.5194/we-16-89-2016, https://doi.org/10.5194/we-16-89-2016, 2016
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In this work the effects of warming on phytoplankton communities was investigated. An indoor experiment was performed in which water from a Mediterranean lagoon was incubated at different temperatures. A shift towards smaller taxa resulted in a higher total biomass but lower chlorophyll a concentrations at the highest temperature. This study contributes to the knowledge on the responses of phytoplankton to warming, which is still scarce in Mediterranean marine and brackish environments.
Anna-Karin Almén, Anu Vehmaa, Andreas Brutemark, Lennart Bach, Silke Lischka, Annegret Stuhr, Sara Furuhagen, Allanah Paul, J. Rafael Bermúdez, Ulf Riebesell, and Jonna Engström-Öst
Biogeosciences, 13, 1037–1048, https://doi.org/10.5194/bg-13-1037-2016, https://doi.org/10.5194/bg-13-1037-2016, 2016
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We studied the effects of ocean acidification (OA) on the aquatic crustacean Eurytemora affinis and measured offspring production in relation to pH, chlorophyll, algae, fatty acids, and oxidative stress. No effects on offspring production or pH effects via food were found. E. affinis seems robust against OA on a physiological level and did probably not face acute pH stress in the treatments, as the species naturally face large pH fluctuations.
J. Meyer, C. R. Löscher, S. C. Neulinger, A. F. Reichel, A. Loginova, C. Borchard, R. A. Schmitz, H. Hauss, R. Kiko, and U. Riebesell
Biogeosciences, 13, 781–794, https://doi.org/10.5194/bg-13-781-2016, https://doi.org/10.5194/bg-13-781-2016, 2016
M. N. Müller, J. Barcelos e Ramos, K. G. Schulz, U. Riebesell, J. Kaźmierczak, F. Gallo, L. Mackinder, Y. Li, P. N. Nesterenko, T. W. Trull, and G. M. Hallegraeff
Biogeosciences, 12, 6493–6501, https://doi.org/10.5194/bg-12-6493-2015, https://doi.org/10.5194/bg-12-6493-2015, 2015
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The White Cliffs of Dover date back to the Cretaceous and are made up of microscopic chalky shells which were produced mainly by marine phytoplankton (coccolithophores). This is iconic proof for their success at times of relatively high seawater calcium concentrations and, as shown here, to be linked to their ability to precipitate calcium as chalk. The invention of calcification can thus be considered an evolutionary milestone allowing coccolithophores to thrive at times when others struggled.
A. Singh, S. E. Baer, U. Riebesell, A. C. Martiny, and M. W. Lomas
Biogeosciences, 12, 6389–6403, https://doi.org/10.5194/bg-12-6389-2015, https://doi.org/10.5194/bg-12-6389-2015, 2015
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Stoichiometry of macronutrients in the subtropical ocean is important to understand how biogeochemical cycles are coupled. We observed that elemental stoichiometry was much higher in the dissolved organic-matter pools than in the particulate organic matter pools. In addition ratios vary with depth due to changes in growth rates of specific phytoplankton groups, namely cyanobacteria. These data will improve biogeochemical models by placing observational constraints on these ratios.
A. J. Paul, L. T. Bach, K.-G. Schulz, T. Boxhammer, J. Czerny, E. P. Achterberg, D. Hellemann, Y. Trense, M. Nausch, M. Sswat, and U. Riebesell
Biogeosciences, 12, 6181–6203, https://doi.org/10.5194/bg-12-6181-2015, https://doi.org/10.5194/bg-12-6181-2015, 2015
J. Meyer and U. Riebesell
Biogeosciences, 12, 1671–1682, https://doi.org/10.5194/bg-12-1671-2015, https://doi.org/10.5194/bg-12-1671-2015, 2015
S. A. Krueger-Hadfield, C. Balestreri, J. Schroeder, A. Highfield, P. Helaouët, J. Allum, R. Moate, K. T. Lohbeck, P. I. Miller, U. Riebesell, T. B. H. Reusch, R. E. M. Rickaby, J. Young, G. Hallegraeff, C. Brownlee, and D. C. Schroeder
Biogeosciences, 11, 5215–5234, https://doi.org/10.5194/bg-11-5215-2014, https://doi.org/10.5194/bg-11-5215-2014, 2014
M. N. Müller, M. Lebrato, U. Riebesell, J. Barcelos e Ramos, K. G. Schulz, S. Blanco-Ameijeiras, S. Sett, A. Eisenhauer, and H. M. Stoll
Biogeosciences, 11, 1065–1075, https://doi.org/10.5194/bg-11-1065-2014, https://doi.org/10.5194/bg-11-1065-2014, 2014
A. Silyakova, R. G. J. Bellerby, K. G. Schulz, J. Czerny, T. Tanaka, G. Nondal, U. Riebesell, A. Engel, T. De Lange, and A. Ludvig
Biogeosciences, 10, 4847–4859, https://doi.org/10.5194/bg-10-4847-2013, https://doi.org/10.5194/bg-10-4847-2013, 2013
J. Czerny, K. G. Schulz, T. Boxhammer, R. G. J. Bellerby, J. Büdenbender, A. Engel, S. A. Krug, A. Ludwig, K. Nachtigall, G. Nondal, B. Niehoff, A. Silyakova, and U. Riebesell
Biogeosciences, 10, 3109–3125, https://doi.org/10.5194/bg-10-3109-2013, https://doi.org/10.5194/bg-10-3109-2013, 2013
J. Czerny, K. G. Schulz, S. A. Krug, A. Ludwig, and U. Riebesell
Biogeosciences, 10, 1937–1941, https://doi.org/10.5194/bg-10-1937-2013, https://doi.org/10.5194/bg-10-1937-2013, 2013
U. Riebesell, J. Czerny, K. von Bröckel, T. Boxhammer, J. Büdenbender, M. Deckelnick, M. Fischer, D. Hoffmann, S. A. Krug, U. Lentz, A. Ludwig, R. Muche, and K. G. Schulz
Biogeosciences, 10, 1835–1847, https://doi.org/10.5194/bg-10-1835-2013, https://doi.org/10.5194/bg-10-1835-2013, 2013
N. Aberle, K. G. Schulz, A. Stuhr, A. M. Malzahn, A. Ludwig, and U. Riebesell
Biogeosciences, 10, 1471–1481, https://doi.org/10.5194/bg-10-1471-2013, https://doi.org/10.5194/bg-10-1471-2013, 2013
A. Engel, C. Borchard, J. Piontek, K. G. Schulz, U. Riebesell, and R. Bellerby
Biogeosciences, 10, 1291–1308, https://doi.org/10.5194/bg-10-1291-2013, https://doi.org/10.5194/bg-10-1291-2013, 2013
A. de Kluijver, K. Soetaert, J. Czerny, K. G. Schulz, T. Boxhammer, U. Riebesell, and J. J. Middelburg
Biogeosciences, 10, 1425–1440, https://doi.org/10.5194/bg-10-1425-2013, https://doi.org/10.5194/bg-10-1425-2013, 2013
C. P. D. Brussaard, A. A. M. Noordeloos, H. Witte, M. C. J. Collenteur, K. Schulz, A. Ludwig, and U. Riebesell
Biogeosciences, 10, 719–731, https://doi.org/10.5194/bg-10-719-2013, https://doi.org/10.5194/bg-10-719-2013, 2013
A.-S. Roy, S. M. Gibbons, H. Schunck, S. Owens, J. G. Caporaso, M. Sperling, J. I. Nissimov, S. Romac, L. Bittner, M. Mühling, U. Riebesell, J. LaRoche, and J. A. Gilbert
Biogeosciences, 10, 555–566, https://doi.org/10.5194/bg-10-555-2013, https://doi.org/10.5194/bg-10-555-2013, 2013
T. Tanaka, S. Alliouane, R. G. B. Bellerby, J. Czerny, A. de Kluijver, U. Riebesell, K. G. Schulz, A. Silyakova, and J.-P. Gattuso
Biogeosciences, 10, 315–325, https://doi.org/10.5194/bg-10-315-2013, https://doi.org/10.5194/bg-10-315-2013, 2013
J. Piontek, C. Borchard, M. Sperling, K. G. Schulz, U. Riebesell, and A. Engel
Biogeosciences, 10, 297–314, https://doi.org/10.5194/bg-10-297-2013, https://doi.org/10.5194/bg-10-297-2013, 2013
K. G. Schulz, R. G. J. Bellerby, C. P. D. Brussaard, J. Büdenbender, J. Czerny, A. Engel, M. Fischer, S. Koch-Klavsen, S. A. Krug, S. Lischka, A. Ludwig, M. Meyerhöfer, G. Nondal, A. Silyakova, A. Stuhr, and U. Riebesell
Biogeosciences, 10, 161–180, https://doi.org/10.5194/bg-10-161-2013, https://doi.org/10.5194/bg-10-161-2013, 2013
M. Sperling, J. Piontek, G. Gerdts, A. Wichels, H. Schunck, A.-S. Roy, J. La Roche, J. Gilbert, J. I. Nissimov, L. Bittner, S. Romac, U. Riebesell, and A. Engel
Biogeosciences, 10, 181–191, https://doi.org/10.5194/bg-10-181-2013, https://doi.org/10.5194/bg-10-181-2013, 2013
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Evaluating environmental drivers of spatial variability in free-living nematode assemblages along the Portuguese margin
Ciliate and mesozooplankton community response to increasing CO2 levels in the Baltic Sea: insights from a large-scale mesocosm experiment
Ulrike Hanz, Claudia Wienberg, Dierk Hebbeln, Gerard Duineveld, Marc Lavaleye, Katriina Juva, Wolf-Christian Dullo, André Freiwald, Leonardo Tamborrino, Gert-Jan Reichart, Sascha Flögel, and Furu Mienis
Biogeosciences, 16, 4337–4356, https://doi.org/10.5194/bg-16-4337-2019, https://doi.org/10.5194/bg-16-4337-2019, 2019
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Along the Namibian and Angolan margins, low oxygen conditions do not meet environmental ranges for cold–water corals and hence are expected to be unsuitable habitats. Environmental conditions show that tidal movements deliver water with more oxygen and high–quality organic matter, suggesting that corals compensate unfavorable conditions with availability of food. With the expected expansion of oxygen minimum zones in the future, this study provides an example how ecosystems cope with extremes.
Alexia Dubuc, Ronald Baker, Cyril Marchand, Nathan J. Waltham, and Marcus Sheaves
Biogeosciences, 16, 3959–3976, https://doi.org/10.5194/bg-16-3959-2019, https://doi.org/10.5194/bg-16-3959-2019, 2019
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Little is known about how hypoxia influences mangrove fish assemblages. In situ video observations reveal species-specific avoidance strategies in response to developing hypoxia in a mangrove forest. Taxa commonly using mangroves could withstand hypoxia, while others usually associated with reef habitats were not recorded below 70 % saturation. These results suggest that hypoxia is an important factor shaping mangrove fish assemblages and could explain the low species richness usually observed.
Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Miguel Ángel Fuertes, Hartmut Schulz, Yann Marcon, Nele Manon Vollmar, José-Abel Flores, and Frank Lamy
Biogeosciences, 16, 3679–3702, https://doi.org/10.5194/bg-16-3679-2019, https://doi.org/10.5194/bg-16-3679-2019, 2019
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Open ocean phytoplankton include coccolithophore algae, a key element in carbon cycle regulation with important feedbacks to the climate system. We document latitudinal variability in both coccolithophore assemblage and the mass variation in one particular species, Emiliania huxleyi, for a transect across the Drake Passage (in the Southern Ocean). Coccolithophore abundance, diversity and maximum depth habitat decrease southwards, coinciding with changes in the predominant E. huxleyi morphotypes.
Freija Hauquier, Lara Macheriotou, Tania N. Bezerra, Great Egho, Pedro Martínez Arbizu, and Ann Vanreusel
Biogeosciences, 16, 3475–3489, https://doi.org/10.5194/bg-16-3475-2019, https://doi.org/10.5194/bg-16-3475-2019, 2019
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Future mining operations in the deep sea provide a source of scientific uncertainty and call for detailed study of the ecosystem. We investigated one of the most diverse and abundant taxa present in deep-sea sediments, nematodes, and demonstrate the importance of sediment attributes for their communities. Especially species that are less common and have a limited spatial distribution will be vulnerable to mining-induced changes. Our findings can serve as a reference for future impact studies.
Haruka Takagi, Katsunori Kimoto, Tetsuichi Fujiki, Hiroaki Saito, Christiane Schmidt, Michal Kucera, and Kazuyoshi Moriya
Biogeosciences, 16, 3377–3396, https://doi.org/10.5194/bg-16-3377-2019, https://doi.org/10.5194/bg-16-3377-2019, 2019
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Photosymbiosis (endosymbiosis with algae) is an evolutionary important ecology for many marine organisms but has poorly been identified among planktonic foraminifera. In this study, we identified and characterized photosymbiosis of various species of planktonic foraminifera by focusing on their photosynthesis–related features. We finally proposed a new framework showing a potential strength of photosymbiosis, which will serve as a basis for future ecological studies of planktonic foraminifera.
Elina A. Virtanen, Alf Norkko, Antonia Nyström Sandman, and Markku Viitasalo
Biogeosciences, 16, 3183–3195, https://doi.org/10.5194/bg-16-3183-2019, https://doi.org/10.5194/bg-16-3183-2019, 2019
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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.
Oscar E. Romero, Karl-Heinz Baumann, Karin A. F. Zonneveld, Barbara Donner, Jens Hefter, Bambaye Hamady, and Gerhard Fischer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-314, https://doi.org/10.5194/bg-2019-314, 2019
Revised manuscript accepted for BG
Jeffrey C. Drazen, Astrid B. Leitner, Sage Morningstar, Yann Marcon, Jens Greinert, and Autun Purser
Biogeosciences, 16, 3133–3146, https://doi.org/10.5194/bg-16-3133-2019, https://doi.org/10.5194/bg-16-3133-2019, 2019
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We investigated the fish and scavenger community after a deep seafloor disturbance experiment intended to simulate the effects of deep-sea mining. Fish density returned to background levels after several years; however the dominant fish was rarely found in ploughed habitat after 26 years. Given the significantly larger scale of industrial mining, these results could translate to population-level effects. The abyssal fish community at the site was similar to that in the Clarion–Clipperton Zone.
Scarlett Trimborn, Silke Thoms, Pascal Karitter, and Kai Bischof
Biogeosciences, 16, 2997–3008, https://doi.org/10.5194/bg-16-2997-2019, https://doi.org/10.5194/bg-16-2997-2019, 2019
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Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. Our results reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis of the Antarctic cyrptophyte Geminigera cryophila. Hence, cryptophytes such as G. cryophila may be potential winners of these climatic changes.
Daffne C. López-Sandoval, Katherine Rowe, Paloma Carillo-de-Albonoz, Carlos M. Duarte, and Susana Agustí
Biogeosciences, 16, 2983–2995, https://doi.org/10.5194/bg-16-2983-2019, https://doi.org/10.5194/bg-16-2983-2019, 2019
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We addressed how the intertwined effect of temperature and nutrients modulates the metabolic response of planktonic communities in the Red Sea, one of the warmest seas on earth. Our study unveiled that photosynthesis increases at a faster pace than respiration rates for this group of organisms formed by microalgae, bacteria, and drifting animals. This anomaly is likely due to the nature of the basin where the warmest waters are frequently enriched with nutrients, which favours microalgae growth.
Camilla Parzanini, Christopher C. Parrish, Jean-François Hamel, and Annie Mercier
Biogeosciences, 16, 2837–2856, https://doi.org/10.5194/bg-16-2837-2019, https://doi.org/10.5194/bg-16-2837-2019, 2019
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This review synthesized current knowledge of deep-sea food webs and provided a preliminary analysis of global geographic patterns in the biochemical composition of deep-water organisms. Our results revealed both latitudinal and depth wise trends in the biochemical composition of deep-sea animals. In addition, the link across latitudes between surface primary production and deep-water communities was highlighted, which has important implications in the face of global climate change.
Susann Rossbach, Vincent Saderne, Andrea Anton, and Carlos M. Duarte
Biogeosciences, 16, 2635–2650, https://doi.org/10.5194/bg-16-2635-2019, https://doi.org/10.5194/bg-16-2635-2019, 2019
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Giant clams including the species Tridacna maxima are unique among bivalves as they live in symbiosis with unicellular algae and generally function as net photoautotrophs. Light is therefore crucial for these species to thrive. We show that net calcification and photosynthetic rates of T. maxima are light dependent, with maximum rates at conditions comparable to 4 m water depth, reflected also in the depth-related distribution in the Red Sea with maximum abundances in shallow sunlit coral reefs.
Lisa Mevenkamp, Katja Guilini, Antje Boetius, Johan De Grave, Brecht Laforce, Dimitri Vandenberghe, Laszlo Vincze, and Ann Vanreusel
Biogeosciences, 16, 2329–2341, https://doi.org/10.5194/bg-16-2329-2019, https://doi.org/10.5194/bg-16-2329-2019, 2019
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To elucidate the potential effects of crushed nodule particle deposition on abyssal meiobenthos, we covered abyssal soft sediment in the Peru Basin (4200 m depth) with approximately 2 cm of this nodule material for 11 d. About half of the meiobenthos migrated from the sediment into the added material, and nematode feeding type proportions in that added layer were altered. These results considerably contribute to our understanding of the short-term responses of deep-sea meiobenthos to burial.
Maria Grigoratou, Fanny M. Monteiro, Daniela N. Schmidt, Jamie D. Wilson, Ben A. Ward, and Andy Ridgwell
Biogeosciences, 16, 1469–1492, https://doi.org/10.5194/bg-16-1469-2019, https://doi.org/10.5194/bg-16-1469-2019, 2019
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The paper presents a novel study based on the traits of shell size, calcification and feeding behaviour of two planktonic foraminifera life stages using modelling simulations. With the model, we tested the cost and benefit of calcification and explored how the interactions of planktonic foraminifera among other plankton groups influence their biomass under different environmental conditions. Our results provide new insights into environmental controls in planktonic foraminifera ecology.
Shanying Tong, David A. Hutchins, and Kunshan Gao
Biogeosciences, 16, 561–572, https://doi.org/10.5194/bg-16-561-2019, https://doi.org/10.5194/bg-16-561-2019, 2019
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Most previous studies concerning the effects of environmental changes on marine organisms have been carried out under
photosynthetically active radiation onlyconditions, with solar ultraviolet radiation (UVR) not being considered. In this study, we found that UVR can counteract the negative effects of the
greenhousetreatment on the calcification rate to photosynthesis rate ratio, and may be a key stressor when considering the impacts of future greenhouse conditions on E. huxleyi.
Catherine A. Pfister and Mark A. Altabet
Biogeosciences, 16, 193–206, https://doi.org/10.5194/bg-16-193-2019, https://doi.org/10.5194/bg-16-193-2019, 2019
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Microbial assemblages on host plants and animals are an increasingly recognized biological phenomenon. We present evidence that microbes in association with mussels and seaweeds are contributing greatly to nitrogen cycling in coastal marine areas, often many times that of the microbes that are simply free-living in seawater. The addition of dissolved organic carbon increased nutrient uptake by microbes, suggesting that coastal species enhance microbial metabolism through resource provisioning.
François Carlotti, Marc Pagano, Loïc Guilloux, Katty Donoso, Valentina Valdés, Olivier Grosso, and Brian P. V. Hunt
Biogeosciences, 15, 7273–7297, https://doi.org/10.5194/bg-15-7273-2018, https://doi.org/10.5194/bg-15-7273-2018, 2018
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The paper characterizes the zooplankton community and plankton food web processes between New Caledonia and Tahiti (tropical South Pacific) during the austral summer 2015. In this region, the pelagic production depends on N2 fixation by diazotroph microorganisms on which the zooplankton community feeds, supporting a pelagic food chain ending with valuable tuna fisheries. We estimated a contribution of up to 75 % of diazotroph‐derived nitrogen to zooplankton biomass in the Melanesian archipelago.
Ana Martinez, Laura Hernández-Terrones, Mario Rebolledo-Vieyra, and Adina Paytan
Biogeosciences, 15, 6819–6832, https://doi.org/10.5194/bg-15-6819-2018, https://doi.org/10.5194/bg-15-6819-2018, 2018
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Our study at low-pH submarine springs suggests that ocean acidification may reduce the number of Caribbean benthic foraminifera, particularly those species that form carbonate shells. This may have subsequent repercussions on the global carbon cycle and marine food webs that depend on benthic foraminifera.
Janet E. Burke, Willem Renema, Michael J. Henehan, Leanne E. Elder, Catherine V. Davis, Amy E. Maas, Gavin L. Foster, Ralf Schiebel, and Pincelli M. Hull
Biogeosciences, 15, 6607–6619, https://doi.org/10.5194/bg-15-6607-2018, https://doi.org/10.5194/bg-15-6607-2018, 2018
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Metabolic rates are sensitive to environmental conditions and can skew geochemical measurements. However, there is no way to track these rates through time. Here we investigate the controls of test porosity in planktonic foraminifera (organisms commonly used in paleoclimate studies) as a potential proxy for metabolic rate. We found that the porosity varies with body size and temperature, two key controls on metabolic rate, and that it can respond to rapid changes in ambient temperature.
Anna Roik, Till Röthig, Claudia Pogoreutz, Vincent Saderne, and Christian R. Voolstra
Biogeosciences, 15, 6277–6296, https://doi.org/10.5194/bg-15-6277-2018, https://doi.org/10.5194/bg-15-6277-2018, 2018
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In this study we collected in situ accretion/erosion rates and abiotic/biotic variables to estimate carbonate budgets and ecological drivers of coral reef growth in the central Red Sea. Our data suggest that reef growth is comparable to estimates of other regions, but the erosive forces in the Red Sea are not as pronounced. Comparison with recent data suggests that Red Sea reef growth might not have decreased over the past decades, despite warming, calling for more detailed investigations.
Craig S. Young and Christopher J. Gobler
Biogeosciences, 15, 6167–6183, https://doi.org/10.5194/bg-15-6167-2018, https://doi.org/10.5194/bg-15-6167-2018, 2018
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Photosynthetic activity and/or nitrate assimilation by the macroalgae Ulva buffered carbonate chemistry and yielded enhanced growth of bivalves by mitigating the harmful effects of elevated CO2 levels. This benefit was not limited to acidified conditions, as evidenced by increased bivalve growth in the presence of Ulva within ambient CO2 treatments. The ability of macroalgae to buffer carbonate chemistry may be increasingly important for calcifying organisms vulnerable to ocean acidification.
Tasnim Patel, Henri Robert, Cedric D'Udekem D'Acoz, Koen Martens, Ilse De Mesel, Steven Degraer, and Isa Schön
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-347, https://doi.org/10.5194/bg-2018-347, 2018
Revised manuscript accepted for BG
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Exploitation of deep-sea resources in one of the largest ecosystems on the planet, have rendered research of its biodiversity more urgent than ever before. We investigated the impact of mining in the deep sea on amphipods, and now have important knowledge on the known habitats and connectivity of several species. We also demonstrate that a long-term disturbance experiment (Peru Basin) has had a detrimental impact on amphipod biodiversity, instrumental data for formulating sustainable policies.
Arunima Sen, Emmelie K. L. Åström, Wei-Li Hong, Alexey Portnov, Malin Waage, Pavel Serov, Michael L. Carroll, and JoLynn Carroll
Biogeosciences, 15, 4533–4559, https://doi.org/10.5194/bg-15-4533-2018, https://doi.org/10.5194/bg-15-4533-2018, 2018
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Diverse benthic communities populate a site of methane seepage on the Arctic shelf. Despite a likely reliance on sulfide as an energy source, Oligobrachia worm distributions did not correlate with sulfide concentrations. We suggest that sulfide and carbon generation linked to microbial activity and high methane fluxes determines their presence or absence. We discuss the site and our results within the context of Arctic ecology and economy as well as the biology of seafloor hydrocarbon seeps.
Clara Jule Marie Hoppe, Clara M. Flintrop, and Björn Rost
Biogeosciences, 15, 4353–4365, https://doi.org/10.5194/bg-15-4353-2018, https://doi.org/10.5194/bg-15-4353-2018, 2018
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Responses of the Arctic microalgae Micromonas pusilla to different pCO2 levels were investigated at two temperatures. We observed that warming and ocean acidification (OA) synergistically increased growth rates. Furthermore, elevated temperature shifted the pCO2 optimum of biomass production to higher levels. This seem to be caused by more efficient photosynthesis under warmer and more acidic conditions. Our findings explain the dominance of picoeukaryotes frequently observed in OA experiments.
Tanja Stratmann, Lidia Lins, Autun Purser, Yann Marcon, Clara F. Rodrigues, Ascensão Ravara, Marina R. Cunha, Erik Simon-Lledó, Daniel O. B. Jones, Andrew K. Sweetman, Kevin Köser, and Dick van Oevelen
Biogeosciences, 15, 4131–4145, https://doi.org/10.5194/bg-15-4131-2018, https://doi.org/10.5194/bg-15-4131-2018, 2018
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Extraction of polymetallic nodules will have negative impacts on the deep-sea ecosystem, but it is not known whether the ecosystem is able to recover from them. Therefore, in 1989 a sediment disturbance experiment was conducted in the Peru Basin to mimic deep-sea mining. Subsequently, the experimental site was re-visited 5 times to monitor the recovery of fauna. We developed food-web models for all 5 time steps and found that, even after 26 years, carbon flow in the system differs significantly.
Margaux Gourdal, Martine Lizotte, Guillaume Massé, Michel Gosselin, Michel Poulin, Michael Scarratt, Joannie Charette, and Maurice Levasseur
Biogeosciences, 15, 3169–3188, https://doi.org/10.5194/bg-15-3169-2018, https://doi.org/10.5194/bg-15-3169-2018, 2018
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Melt ponds (MP) forming over first year ice (FYI) represent a potential source of the climate-relevant gas dimethylsulfide (DMS) to the atmosphere. Nine MP were sampled in the Canadian Arctic Archipelago. DMS concentrations reaching up to 6 nmol L−1, twice the world's surface oceanic mean, were measured. Seawater intrusion appeared to seed MP with DMS-producing communities. DMS flux from Arctic MP is expected to increase in response to the expanding areal and temporal trends of MP on FYI.
Mar Benavides, Katyanne M. Shoemaker, Pia H. Moisander, Jutta Niggemann, Thorsten Dittmar, Solange Duhamel, Olivier Grosso, Mireille Pujo-Pay, Sandra Hélias-Nunige, Alain Fumenia, and Sophie Bonnet
Biogeosciences, 15, 3107–3119, https://doi.org/10.5194/bg-15-3107-2018, https://doi.org/10.5194/bg-15-3107-2018, 2018
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We measured N2 fixation rates and identified diazotrophic phylotypes in the mesopelagic layer along a transect spanning from New Caledonia to French Polynesia. N2 fixation rates were low but consistently detected across all depths and stations. A distinct diazotrophic phylotype dominated at 650 dbar, coinciding with the oxygenated Subantarctic Mode Water (SAMW) and suggesting that the distribution of aphotic diazotroph communities is to some extent controlled by water mass structure.
Sebastiaan Mestdagh, Leila Bagaço, Ulrike Braeckman, Tom Ysebaert, Bart De Smet, Tom Moens, and Carl Van Colen
Biogeosciences, 15, 2587–2599, https://doi.org/10.5194/bg-15-2587-2018, https://doi.org/10.5194/bg-15-2587-2018, 2018
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We studied how invertebrate communities of mudflats are affected by sudden deposition of sediment. We applied sediment layers of different thickness to mudflat communities and studied how their densities, diversity, and behaviour and the exchange of oxygen between the bottom and the water column changed. We found that some species easily diminish in numbers, while others become more active after deposition. The interaction of all species effects influences the environment, i.e. oxygen exchange.
France Van Wambeke, Audrey Gimenez, Solange Duhamel, Cécile Dupouy, Dominique Lefevre, Mireille Pujo-Pay, and Thierry Moutin
Biogeosciences, 15, 2669–2689, https://doi.org/10.5194/bg-15-2669-2018, https://doi.org/10.5194/bg-15-2669-2018, 2018
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The western tropical South Pacific Ocean has recently been shown to be a hotspot for biological nitrogen fixation. In this study, we examined the horizontal and vertical distribution of heterotrophic prokaryotic production alongside photosynthetic rates, nitrogen fixation rates and phosphate turnover times across the western tropical South Pacific Ocean, in order to relate these fluxes to bottom–up controls (related to nitrogen, phosphate and labile C availability).
Alyce M. Hancock, Andrew T. Davidson, John McKinlay, Andrew McMinn, Kai G. Schulz, and Rick L. van den Enden
Biogeosciences, 15, 2393–2410, https://doi.org/10.5194/bg-15-2393-2018, https://doi.org/10.5194/bg-15-2393-2018, 2018
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Absorption of carbon dioxide (CO2) realized by humans is decreasing the ocean pH (ocean acidification). Single-celled organisms (microbes) support the Antarctic ecosystem, yet little is known about their sensitivity to ocean acidification. This study shows a shift in a natural Antarctic microbial community, with CO2 levels exceeding 634 μatm changing the community composition and favouring small cells. This would have significant flow effects for Antarctic food webs and elemental cycles.
Mianrun Chen, Dongyoung Kim, Hongbin Liu, and Chang-Keun Kang
Biogeosciences, 15, 2055–2073, https://doi.org/10.5194/bg-15-2055-2018, https://doi.org/10.5194/bg-15-2055-2018, 2018
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The trophic preference (i.e., food resources and trophic levels) of different copepod groups was assessed along a salinity gradient in the temperate estuarine Gwangyang Bay of Korea, based on a seasonal investigation of taxonomic results in 2015 and stable isotope analysis incorporating multiple linear regression models. Our results depict a simple energy flow of the planktonic food web of Gwangyang Bay.
Katrin Schmidt, Thomas A. Brown, Simon T. Belt, Louise C. Ireland, Kyle W. R. Taylor, Sally E. Thorpe, Peter Ward, and Angus Atkinson
Biogeosciences, 15, 1987–2006, https://doi.org/10.5194/bg-15-1987-2018, https://doi.org/10.5194/bg-15-1987-2018, 2018
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Sea ice cover is declining across the polar regions, but its importance for the food webs is largely unknown. We used certain diatom metabolites to trace ice-derived and ice-conditioned algae production within pelagic grazers. Our results show that zooplankton can feed on ice algae long after their release into the water column, and that the marginal ice zone can act as an important feeding ground. Predictions on future functioning of polar ecosystems need to consider such subtle relationships.
Andrés S. Rigual Hernández, José A. Flores, Francisco J. Sierro, Miguel A. Fuertes, Lluïsa Cros, and Thomas W. Trull
Biogeosciences, 15, 1843–1862, https://doi.org/10.5194/bg-15-1843-2018, https://doi.org/10.5194/bg-15-1843-2018, 2018
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Long-term and annual field observations on key organisms are a critical basis for predicting changes in Southern Ocean ecosystems. Coccolithophores are the most abundant calcium-carbonate-producing phytoplankton and play an important role in Southern Ocean biogeochemical cycles. In this study we document the composition, degree of calcification and annual cycle of coccolithophore communities in one of the largest unexplored regions of the world oceans: the Antarctic zone.
Caroline Echappé, Pierre Gernez, Vona Méléder, Bruno Jesus, Bruno Cognie, Priscilla Decottignies, Koen Sabbe, and Laurent Barillé
Biogeosciences, 15, 905–918, https://doi.org/10.5194/bg-15-905-2018, https://doi.org/10.5194/bg-15-905-2018, 2018
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Using satellite technology and a life-size experiment, we analysed the impact of oyster reefs on mats of microscopic algae that develop within coastal mudflats. We showed that the relationship between microalgae and oysters is not limited to a one-way process where microalgae are a food source to oysters, but that oysters also promote microalgae mats development, presumably by providing nutrients to them. This might yield new insights into coastal ecosystem management.
Xin Lin, Ruiping Huang, Yan Li, Futian Li, Yaping Wu, David A. Hutchins, Minhan Dai, and Kunshan Gao
Biogeosciences, 15, 551–565, https://doi.org/10.5194/bg-15-551-2018, https://doi.org/10.5194/bg-15-551-2018, 2018
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We examine the effects of elevated CO2 on bacterioplankton community during a mesocosm experiment in subtropical, eutrophic coastal waters in southern China. We found that the elevated CO2 hardly altered the network structure of the bacterioplankton taxa present with high abundance but appeared to reassemble the community network of taxa with low abundance. Results suggest that the bacterioplankton community in this subtropical, high-nutrient coastal environment is insensitive to elevated CO2.
Stacy Deppeler, Katherina Petrou, Kai G. Schulz, Karen Westwood, Imojen Pearce, John McKinlay, and Andrew Davidson
Biogeosciences, 15, 209–231, https://doi.org/10.5194/bg-15-209-2018, https://doi.org/10.5194/bg-15-209-2018, 2018
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We combined productivity and photophysiology measurements to investigate the effects of ocean acidification on a natural Antarctic marine microbial community. Our study identifies a threshold for CO2 tolerance in the phytoplankton community between 953 and 1140 μatm of CO2, above which productivity declines. Bacteria were tolerant to CO2 up to 1641 μatm. We identify physiological changes in the phytoplankton at high CO2 that allowed them to acclimate to the high CO2 treatment.
James B. Bell, William D. K. Reid, David A. Pearce, Adrian G. Glover, Christopher J. Sweeting, Jason Newton, and Clare Woulds
Biogeosciences, 14, 5705–5725, https://doi.org/10.5194/bg-14-5705-2017, https://doi.org/10.5194/bg-14-5705-2017, 2017
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Sedimented hydrothermal vents are among the least studied deep-sea ecosystems. We compared food webs between hydrothermally active and off-vent areas of the Bransfield Strait, Antarctica. Invertebrates showed diverse feeding strategies and occupied different positions in food webs between vent and non-vent sites. Feeding and microbial diversity was lowest at vent sites. Chemosynthetic organic matter was a minimal food source at both vents and non-vents.
Erwann Legrand, Pascal Riera, Mathieu Lutier, Jérôme Coudret, Jacques Grall, and Sophie Martin
Biogeosciences, 14, 5359–5376, https://doi.org/10.5194/bg-14-5359-2017, https://doi.org/10.5194/bg-14-5359-2017, 2017
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In relation to ocean acidification and warming, most studies are focused on specific responses but do not consider species interactions. This study examined experimentally the response of a maerl bed community, composed of calcareous and fleshy algae and grazers, to ocean acidification and warming. Our results indicate that the response of marine communities to climate change will depend on the direct effects on species physiology and the indirect effects due to shifts in species interactions.
Yaping Wu, Furong Yue, Juntian Xu, and John Beardall
Biogeosciences, 14, 5029–5037, https://doi.org/10.5194/bg-14-5029-2017, https://doi.org/10.5194/bg-14-5029-2017, 2017
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Diatoms were less inhibited by UV radiation under moderately increased temperature. Benthic diatoms were more resistant to UV radiation than planktonic species under extremely high temperature as found in the intertidal zone. These differential responses were linked to repair and damage processes of photosystem II.
Catarina V. Guerreiro, Karl-Heinz Baumann, Geert-Jan A. Brummer, Gerhard Fischer, Laura F. Korte, Ute Merkel, Carolina Sá, Henko de Stigter, and Jan-Berend W. Stuut
Biogeosciences, 14, 4577–4599, https://doi.org/10.5194/bg-14-4577-2017, https://doi.org/10.5194/bg-14-4577-2017, 2017
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Our study provides insights into the factors governing the spatio-temporal variability of coccolithophores in the equatorial North Atlantic and illustrates how this supposedly oligotrophic and stable open-ocean region actually reveals significant ecological variability. We provide evidence for Saharan dust and the Amazon River acting as fertilizers for phytoplankton and highlight the the importance of the thermocline depth for coccolithophore productivity in the lower photic zone.
Andrew McMinn
Biogeosciences, 14, 3927–3935, https://doi.org/10.5194/bg-14-3927-2017, https://doi.org/10.5194/bg-14-3927-2017, 2017
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Dissolved carbon dioxide levels in the oceans are rising and this is causing a drop in the pH (ocean acidification). This potentially effects all marine organisms, including those in polar regions. Sea ice algae are naturally exposed to a wide range of pH and CO2 concentrations, particularly during the ice formation and melting cycles. However, all studies so far have shown ice algae to be quite resilient to change. This includes the effects of co-stressors such as light, iron and temperature.
Jeffrey J. Kelleway, Neil Saintilan, Peter I. Macreadie, Jeffrey A. Baldock, and Peter J. Ralph
Biogeosciences, 14, 3763–3779, https://doi.org/10.5194/bg-14-3763-2017, https://doi.org/10.5194/bg-14-3763-2017, 2017
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In this study, we compare rates of accretion, C content, source and stability between different salt marsh vegetation assemblages, using a range of analytical techniques. We find substantial differences in surface and carbon dynamics among assemblages, driven by both biological and physical processes. These findings have important implications for the fate of tidal wetlands and their capacity for accumulating carbon during a time of environmental change.
Daphne Cuvelier, Pierre Legendre, Agathe Laës-Huon, Pierre-Marie Sarradin, and Jozée Sarrazin
Biogeosciences, 14, 2955–2977, https://doi.org/10.5194/bg-14-2955-2017, https://doi.org/10.5194/bg-14-2955-2017, 2017
Julia Wukovits, Annekatrin Julie Enge, Wolfgang Wanek, Margarete Watzka, and Petra Heinz
Biogeosciences, 14, 2815–2829, https://doi.org/10.5194/bg-14-2815-2017, https://doi.org/10.5194/bg-14-2815-2017, 2017
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This study reports the response of two intertidal foraminifera to increased temperatures on the level of carbon and nitrogen uptake. Interspecific variations in the ability to cope with shifting environmental variables within the two commonly associated species show that temperature and food source might be critical factors that control their abundances. This should support the interpretation of sediment samples and increase knowledge about nutrient fluxes through foraminiferal communities.
Glaucia M. Fragoso, Alex J. Poulton, Igor M. Yashayaev, Erica J. H. Head, and Duncan A. Purdie
Biogeosciences, 14, 1235–1259, https://doi.org/10.5194/bg-14-1235-2017, https://doi.org/10.5194/bg-14-1235-2017, 2017
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This research describes a detailed analysis of current distributions of spring phytoplankton communities in the Labrador Sea based on 10 years of observations. Phytoplankton community composition varied mainly according to the contrasting hydrographical zones of the Labrador Sea. The taxonomic distinctions of these communities influenced the photosynthetic and biochemical signatures of near-surface waters, which may have a profound impact on the carbon cycle in high-latitude seas.
Pascal Conan, Mireille Pujo-Pay, Marina Agab, Laura Calva-Benítez, Sandrine Chifflet, Pascal Douillet, Claire Dussud, Renaud Fichez, Christian Grenz, Francisco Gutierrez Mendieta, Montserrat Origel-Moreno, Arturo Rodríguez-Blanco, Caroline Sauret, Tatiana Severin, Marc Tedetti, Rocío Torres Alvarado, and Jean-François Ghiglione
Biogeosciences, 14, 959–975, https://doi.org/10.5194/bg-14-959-2017, https://doi.org/10.5194/bg-14-959-2017, 2017
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Coastal lagoons are extremely rich, diverse, and dynamic but very fragile ecosystems subject to anthropogenic pressures. A joint France–Mexico biogeochemical study was conducted in the Términos Lagoon under severe drought related to an El Niño Modoki episode. In short, the water column of the Términos Lagoon functioned as a nitrogen sink, but variation in mineral stoichiometry across the lagoon mainly accounted for the heterogeneity in microbial distribution and activity.
Clare Bird, Kate F. Darling, Ann D. Russell, Catherine V. Davis, Jennifer Fehrenbacher, Andrew Free, Michael Wyman, and Bryne T. Ngwenya
Biogeosciences, 14, 901–920, https://doi.org/10.5194/bg-14-901-2017, https://doi.org/10.5194/bg-14-901-2017, 2017
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Accurate ecological data on planktic foraminifera (calcifying microbes that play an important role in the carbon cycle) are important for modelling their response to climate change. We studied the species G. bulloides. A lack of algal symbionts and unusual shell chemistry suggest a different life history compared to other spinose species. We demonstrate that G. bulloides hosts cyanobacterial endobionts. This has implications for modelling this species and for understanding its shell chemistry.
Eghbert Elvan Ampou, Ofri Johan, Christophe E. Menkes, Fernando Niño, Florence Birol, Sylvain Ouillon, and Serge Andréfouët
Biogeosciences, 14, 817–826, https://doi.org/10.5194/bg-14-817-2017, https://doi.org/10.5194/bg-14-817-2017, 2017
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The 2015–2016 El Niño was the strongest on record and has generated significant coral bleaching and mortality worldwide. In Indonesia, first signs of bleaching were reported in April 2016. However, we show that this El Niño has impacted Indonesian reefs since 2015 through a different process than temperature-induced bleaching. Another El Niño-induced process, sea level fall, is responsible for significant coral mortality on North Sulawesi shallow reefs, and probably throughout Indonesia.
Lidia Lins, Frederik Leliaert, Torben Riehl, Sofia Pinto Ramalho, Eliana Alfaro Cordova, André Morgado Esteves, and Ann Vanreusel
Biogeosciences, 14, 651–669, https://doi.org/10.5194/bg-14-651-2017, https://doi.org/10.5194/bg-14-651-2017, 2017
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Anthropogenic impacts in the deep sea are regarded as high disturbers of the deep-sea bottom. This study focus in trying to understand the impact of disturbance in the ecosystem and how important functions, such as hydrodynamics and surface primary productivity, affect benthic organisms. Our results showed that high sediment variability due to hydrodynamics, and consequently disturbance, combined with high resource availability are probably the main factors promoting deep-sea species coexistence
Silke Lischka, Lennart T. Bach, Kai-Georg Schulz, and Ulf Riebesell
Biogeosciences, 14, 447–466, https://doi.org/10.5194/bg-14-447-2017, https://doi.org/10.5194/bg-14-447-2017, 2017
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We conducted a large-scale field experiment using 55 m3 floating containers (mesocosms) to investigate consequences of near-future projected CO2 elevations (ocean acidification) on a Baltic Sea plankton community in Storfjärden (Finland). The focus of our study was on single- and multicelled small-sized organisms dwelling in the water column. Our results suggest that increasing CO2 concentrations may change the species composition and promote specific food web interactions.
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Ocean acidification is challenging phenotypic plasticity of individuals and populations. We studied phenotypic plasticity of the calanoid copepod Acartia bifilosa in the course of a pelagic, large-volume mesocosm study in the Baltic Sea. We found significant negative effects of ocean acidification on adult female copepod size and egg hatching success. Overall, these results indicate that A. bifilosa could be affected by projected near-future CO2 levels.
Ocean acidification is challenging phenotypic plasticity of individuals and populations. We...
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