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Sommer, Ulrich; Moustaka-Gouni, Maria (2016): Warming and acidification effects on planktonic heterotrophic pico- and nanoflagellates in a mesocosm experiment. PANGAEA,, Supplement to: Moustaka-Gouni, Maria; Kormas, Konstantinos A; Scotti, Marco; Vardaka, S; Sommer, Ulrich (2016): Warming and Acidification Effects on Planktonic Heterotrophic Pico- and Nanoflagellates in a Mesocosm Experiment. Protist, 167(4), 389-410,

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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 west- ern 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 m) 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 phy- toplankton and heterotrophic flagellates during and after the bloom. This complex intraguild predation patterns probably dampened the response to experimental treatments.
Related to:
Sommer, Ulrich; Paul, Carolin; Moustaka-Gouni, Maria (2014): Mesocosm experiment on warming and acidification effects on phytoplankton composition and cell size. PANGAEA,
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1IdentificationIDMoustaka-Gouni, Maria
2TreatmentTreatMoustaka-Gouni, MariaCO2
3TreatmentTreatMoustaka-Gouni, MariaTemperature
4Sample code/labelSample labelMoustaka-Gouni, MariaCO2
5Sample code/labelSample labelMoustaka-Gouni, MariaTemperature
6Sample code/labelSample labelMoustaka-Gouni, MariaDay
7Day of experimentDOEdayMoustaka-Gouni, Maria
8Size fractionFractionMoustaka-Gouni, Maria
9BiovolumeBiovolmm3/lMoustaka-Gouni, Mariamg/l
10Abundance per volumeAbund v#/mlMoustaka-Gouni, Mariax1000 cell mL-1
11RatioRatioMoustaka-Gouni, Mariarelative biovolume
12RatioRatioMoustaka-Gouni, Mariarelative abundance
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