CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities

Diatoms account for 40 % of marine primary production and are considered to be key players in the biological carbon pump. Ocean acidification (OA) is expected to affect diatoms primarily by changing the availability of CO2 as a substrate for photosynthesis or through altered ecological interactions...

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Published in:Ocean Science
Main Authors: Bach, Lennart T., Taucher, Jan
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications (EGU) 2019
Subjects:
Online Access:https://oceanrep.geomar.de/id/eprint/46744/
https://oceanrep.geomar.de/id/eprint/46744/1/os-15-1159-2019.pdf
https://doi.org/10.5194/os-15-1159-2019
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spelling ftoceanrep:oai:oceanrep.geomar.de:46744 2023-05-15T17:50:42+02:00 CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities Bach, Lennart T. Taucher, Jan 2019-08-28 text https://oceanrep.geomar.de/id/eprint/46744/ https://oceanrep.geomar.de/id/eprint/46744/1/os-15-1159-2019.pdf https://doi.org/10.5194/os-15-1159-2019 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/46744/1/os-15-1159-2019.pdf Bach, L. T. and Taucher, J. (2019) CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities. Open Access Ocean Science, 15 . pp. 1159-1175. DOI 10.5194/os-15-1159-2019 <https://doi.org/10.5194/os-15-1159-2019>. doi:10.5194/os-15-1159-2019 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.5194/os-15-1159-2019 2023-04-07T15:45:40Z Diatoms account for 40 % of marine primary production and are considered to be key players in the biological carbon pump. Ocean acidification (OA) is expected to affect diatoms primarily by changing the availability of CO2 as a substrate for photosynthesis or through altered ecological interactions within the marine food web. Yet, there is little consensus how entire diatom communities will respond to increasing CO2. To address this question, we synthesized the literature from over a decade of OA-experiments with natural diatom communities to uncover: 1) if and how bulk diatom communities respond to elevated CO2; 2) if shifts within the diatom communities could be expected and how they are expressed with respect to taxonomic affiliation and size structure. We found that diatom communities responded to high CO2 in ~60 % of the experiments and in this case more often positively (56 %) than negatively (32 %; 12 % did not report the direction of change). Shifts among different diatom species were observed in 65 % of the experiments. Our synthesis supports the hypothesis that high CO2 particularly favors larger species as 12 out of 13 experiments which investigated cell size found a shift towards larger species. Unraveling winners and losers with respect to taxonomic affiliation was difficult due to a limited database, but there is evidence that the genus Pseudo-nitzschia could be among the losers. We conclude that OA-induced changes in diatom competitiveness and assemblage structure must be classified as a “risk for ecosystem services” due to the pivotal role diatoms play in trophic transfer and biogeochemical cycles. Article in Journal/Newspaper Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Ocean Science 15 4 1159 1175
institution Open Polar
collection OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
op_collection_id ftoceanrep
language English
description Diatoms account for 40 % of marine primary production and are considered to be key players in the biological carbon pump. Ocean acidification (OA) is expected to affect diatoms primarily by changing the availability of CO2 as a substrate for photosynthesis or through altered ecological interactions within the marine food web. Yet, there is little consensus how entire diatom communities will respond to increasing CO2. To address this question, we synthesized the literature from over a decade of OA-experiments with natural diatom communities to uncover: 1) if and how bulk diatom communities respond to elevated CO2; 2) if shifts within the diatom communities could be expected and how they are expressed with respect to taxonomic affiliation and size structure. We found that diatom communities responded to high CO2 in ~60 % of the experiments and in this case more often positively (56 %) than negatively (32 %; 12 % did not report the direction of change). Shifts among different diatom species were observed in 65 % of the experiments. Our synthesis supports the hypothesis that high CO2 particularly favors larger species as 12 out of 13 experiments which investigated cell size found a shift towards larger species. Unraveling winners and losers with respect to taxonomic affiliation was difficult due to a limited database, but there is evidence that the genus Pseudo-nitzschia could be among the losers. We conclude that OA-induced changes in diatom competitiveness and assemblage structure must be classified as a “risk for ecosystem services” due to the pivotal role diatoms play in trophic transfer and biogeochemical cycles.
format Article in Journal/Newspaper
author Bach, Lennart T.
Taucher, Jan
spellingShingle Bach, Lennart T.
Taucher, Jan
CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
author_facet Bach, Lennart T.
Taucher, Jan
author_sort Bach, Lennart T.
title CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
title_short CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
title_full CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
title_fullStr CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
title_full_unstemmed CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities
title_sort co2 effects on diatoms: a synthesis of more than a decade of ocean acidification experiments with natural communities
publisher Copernicus Publications (EGU)
publishDate 2019
url https://oceanrep.geomar.de/id/eprint/46744/
https://oceanrep.geomar.de/id/eprint/46744/1/os-15-1159-2019.pdf
https://doi.org/10.5194/os-15-1159-2019
genre Ocean acidification
genre_facet Ocean acidification
op_relation https://oceanrep.geomar.de/id/eprint/46744/1/os-15-1159-2019.pdf
Bach, L. T. and Taucher, J. (2019) CO2 effects on diatoms: A Synthesis of more than a decade of ocean acidification experiments with natural communities. Open Access Ocean Science, 15 . pp. 1159-1175. DOI 10.5194/os-15-1159-2019 <https://doi.org/10.5194/os-15-1159-2019>.
doi:10.5194/os-15-1159-2019
op_rights cc_by_4.0
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.5194/os-15-1159-2019
container_title Ocean Science
container_volume 15
container_issue 4
container_start_page 1159
op_container_end_page 1175
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