Warming and Acidification Effects on Planktonic Heterotrophic Pico- and Nanoflagellates in a Mesocosm Experiment

Moustaka-Gouni, Maria, Kormas, Konstantinos A., Scotti, Marco, Vardaka, Elisabeth and Sommer, Ulrich (2016) Warming and Acidification Effects on Planktonic Heterotrophic Pico- and Nanoflagellates in a Mesocosm Experiment Protist, 167 (4). pp. 389-410. DOI 10.1016/j.protis.2016.06.004.

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Supplementary data:

Abstract

We studied the response of the heterotrophic flagellate (HF) community to the combined impact of warming and ocean acidification in a mesocosm experiment with a plankton community from the western Baltic Sea. We performed a quantitative analysis of the response at the level of total biomass and size classes and a semi-quantitative one at the level of individual taxa. Total biomass of HF was significantly lower under higher temperatures while there was no significant effect of CO2. The mean biomass of the picoflagellates did not respond to temperature while the three nanoflagellate size classes (class limits 3, 5, 8, 15 μm) responded negatively to warming while not responding to CO2. The taxon-level results indicate that heterotrophic flagellates do not form a homogenous trophic guild, as often assumed in pelagic food web studies. Instead, the heterotrophic flagellates formed a “food web within the food web”. There was a pronounced succession of flagellates leading from a dominance of bacterivores and colloidal matter feeders before the phytoplankton bloom to omnivorous feeders preying upon phytoplankton and heterotrophic flagellates during and after the bloom. This complex intraguild predation patterns probably dampened the response to experimental treatments.

Document Type: Article
Keywords: Global Change; heterotrophic flagellates; microbial food-web; acidification; plankton
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.protis.2016.06.004
ISSN: 1434-4610
Projects: BIOACID
Date Deposited: 27 Jul 2016 08:29
Last Modified: 27 Jul 2016 08:29
URI: http://oceanrep.geomar.de/id/eprint/33472

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