Low CO2 Sensitivity of Microzooplankton Communities in the Gullmar Fjord, Skagerrak: Evidence from a Long-Term Mesocosm Study.

Horn, Henriette G., Sander, Nils, Stuhr, Annegret, Alguero-Muniz, María, Bach, Lennart T., Löder, Martin G. J., Boersma, Maarten, Riebesell, Ulf and Aberle, Nicole (2016) Low CO2 Sensitivity of Microzooplankton Communities in the Gullmar Fjord, Skagerrak: Evidence from a Long-Term Mesocosm Study. PLoS ONE, 11 (11). e0165800. DOI 10.1371/journal.pone.0165800.

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Horn et al., 2016 - Low CO2 sensitivity of Microzooplankton communities in the Gullmar Fjord, Skagerrak Evidence from a long-term mesocosm study.pdf - Published Version
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Abstract

Ocean acidification is considered as a crucial stressor for marine communities. In this study, we tested the effects of the IPCC RPC6.0 end-of-century acidification scenario on a natural plankton community in the Gullmar Fjord, Sweden, during a long-term mesocosm experiment from a spring bloom to a mid-summer situation. The focus of this study was on microzooplankton and its interactions with phytoplankton and mesozooplankton. The microzooplankton community was dominated by ciliates, especially small Strombidium sp., with the exception of the last days when heterotrophic dinoflagellates increased in abundance. We did not observe any effects of high CO2 on the community composition and diversity of microzooplankton. While ciliate abundance, biomass and growth rate were not affected by elevated CO2, we observed a positive effect of elevated CO2 on dinoflagellate abundances. Additionally, growth rates of dinoflagellates were significantly higher in the high CO2 treatments. Given the higher Chlorophyll a content measured under high CO2, our results point at mainly indirect effects of CO2 on microzooplankton caused by changes in phytoplankton standing stocks, in this case most likely an increase in small-sized phytoplankton of <8 μm. Overall, the results from the present study covering the most important part of the growing season indicate that coastal microzooplankton communities are rather robust towards realistic acidification scenarios.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
AWI
Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1371/journal.pone.0165800
ISSN: 1932-6203
Projects: BIOACID, Future Ocean
Date Deposited: 08 Dec 2016 09:51
Last Modified: 16 Dec 2016 08:01
URI: http://oceanrep.geomar.de/id/eprint/35119

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