Effects of high CO2 and warming on a Baltic Sea microzooplankton community.

Horn, Henriette G., Boersma, Maarten, Garzke, Jessica, Löder, Martin G. J., Sommer, Ulrich and Aberle, Nicole (2016) Effects of high CO2 and warming on a Baltic Sea microzooplankton community. Open Access ICES Journal of Marine Science, 73 (3). pp. 772-782. DOI 10.1093/icesjms/fsv198.

[thumbnail of Horn et al ICES J MAR SCI 2015.pdf]
Horn et al ICES J MAR SCI 2015.pdf - Published Version

Download (677kB) | Preview

Supplementary data:


Global warming and ocean acidification are among the most important stressors for aquatic ecosystems in the future. To investigate their direct and indirect effects on a near-natural plankton community, a multiple-stressor approach is needed. Hence, we set up mesocosms in a full-factorial design to study the effects of both warming and high CO2 on a Baltic Sea autumn plankton community, concentrating on the impacts on microzooplankton (MZP). MZP abundance, biomass, and species composition were analysed over the course of the experiment. We observed that warming led to a reduced time-lag between the phytoplankton bloom and an MZP biomass maximum. MZP showed a significantly higher growth rate and an earlier biomass peak in the warm treatments while the biomass maximum was not affected. Increased pCO2 did not result in any significant effects on MZP biomass, growth rate, or species composition irrespective of the temperature, nor did we observe any significant interactions between CO2 and temperature. We attribute this to the high tolerance of this estuarine plankton community to fluctuations in pCO2, often resulting in CO2 concentrations higher than the predicted end-of-century concentration for open oceans. In contrast, warming can be expected to directly affect MZP and strengthen its coupling with phytoplankton by enhancing its grazing pressure.

Document Type: Article
Additional Information: WOS:000371142000026
Keywords: CO2, global warming, heterotrophic protists, mesocosm experiment, ocean acidification, protozooplankton.
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
Publisher: Oxford Univ. Press
Projects: BIOACID
Date Deposited: 09 Nov 2015 13:03
Last Modified: 01 Feb 2019 15:14
URI: https://oceanrep.geomar.de/id/eprint/30188

Actions (login required)

View Item View Item