Composition and Dominance of Edible and Inedible Phytoplankton Predict Responses of Baltic Sea Summer Communities to Elevated Temperature and CO2.

Paul, Carolin, Sommer, Ulrich and Matthiessen, Birte (2021) Composition and Dominance of Edible and Inedible Phytoplankton Predict Responses of Baltic Sea Summer Communities to Elevated Temperature and CO2. Open Access Microorganisms, 9 (11). Art.Nr. 2294. DOI 10.3390/microorganisms9112294.

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Abstract

Previous studies with Baltic Sea phytoplankton combining elevated seawater temperature with CO2 revealed the importance of size trait‐based analyses, in particular dividing the plankton into edible (>5 and <100 μm) and inedible ([removed]100 μm) size classes for mesozoopankton grazers. While the edible phytoplankton responded predominantly negative to warming and the inedible group stayed unaffected or increased, independent from edibility most phytoplankton groups gained from CO2. Because the ratio between edible and inedible taxa changes profoundly over seasons, we investigated if community responses can be predicted according to the prevailing composition of edible and inedible groups. We experimentally explored the combined effects of elevated temperatures and CO2 concentrations on a late‐summer Baltic Sea community. Total phytoplankton significantly increased in response to elevated CO2 in particular in combination with temperature, driven by a significant gain of the inedible <5 μm fraction and large filamentous cyanobacteria. Large flagellates disappeared. The edible group was low as usual in summer and decreased with both factors due to enhanced copepod grazing and overall decline of small flagellates. Our results emphasize that the responses of summer communities are complex, but can be predicted by the composition and dominance of size classes and groups.

Document Type: Article
Funder compliance: BMBF: 03F0656
Keywords: elevated temperature; elevated CO2; phytoplankton; Baltic Sea; morpho-functional traits; climate changes
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-OEB Ökosystembiologie des Ozeans
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Corresponding Author:
Corresponding Author Name
GEOMAR ID
Affiliation
Paul, Carolin
Paul, Carolin
FB3-OEB Ökosystembiologie des Ozeans
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: Yes
Publisher: MDPI
Projects: BIOACID
Date Deposited: 16 Nov 2021 09:29
Last Modified: 08 Feb 2023 09:24
URI: https://oceanrep.geomar.de/id/eprint/54417

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