Phytoplankton cell size: intra- and interspecific effects of warming and grazing

Peter, K. H. and Sommer, Ulrich (2012) Phytoplankton cell size: intra- and interspecific effects of warming and grazing PLoS ONE, 7 (11). e49632. DOI 10.1371/ journal.pone.0049632.

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Abstract

Decreasing body size has been suggested as the third universal biological response to global warming after latitudinal/altitudinal range shifts and shifts in phenology. Size shifts in a community can be the composite result of intraspecific size shifts and of shifts between differently sized species. Metabolic explanations for the size shifts dominate in the literature but top down effects, i.e. intensified size-selective consumption at higher temperatures, have been proposed as alternative explanation. Therefore, we performed phytoplankton experiments with a factorial combination of warming and consumer type (protist feeding mainly on small algae vs. copepods mainly feeding on large algae). Natural phytoplankton was exposed to 3 (1st experiment) or 4 (2nd experiment) temperature levels and 3 (1st experiment: nano-, microzooplankton, copepods) or 2 (2nd experiment: microzooplankton, copepods) types of consumers. Size shifts of individual phytoplankton species and community mean size were analyzed. Both, mean cell size of most of the individual species and mean community cell size decreased with temperature under all grazing regimes. Grazing by copepods caused an additional reduction in cell size. Our results reject the hypothesis, that intensified size selective consumption at higher temperature would be the dominant explanation of decreasing body size. In this case, the size reduction would have taken place only in the copepod treatments but not in the treatments with protist grazing (nano- and microzooplankton).

Document Type: Article
Additional Information: WOS:000312376100023
Keywords: Phytoplankton; CLIMATE-CHANGE; FRESH-WATER; MARINE-PHYTOPLANKTON; METABOLIC BALANCE; SPRING BLOOM; ZOOPLANKTON; TEMPERATURE; ECOSYSTEMS; CLADOCERANS; KINETICS
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
DOI etc.: 10.1371/ journal.pone.0049632
ISSN: 1932-6203
Projects: Future Ocean
Date Deposited: 29 Nov 2012 11:47
Last Modified: 22 Jan 2018 14:26
URI: http://eprints.uni-kiel.de/id/eprint/19393

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