Temperature effects on phytoplankton diversity - The zooplankton link.

Lewandowska, Aleksandra M., Hillebrand, Helmut, Lengfellner, Kathrin and Sommer, Ulrich (2014) Temperature effects on phytoplankton diversity - The zooplankton link. Journal of Sea Research, 85 . pp. 359-364. DOI 10.1016/j.seares.2013.07.003.

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Abstract

Highlights:
• We used indoor mesocosms to test the impact of warming on plankton communities.
• Different stages of phytoplankton bloom were analysed.
• Increased temperature and zooplankton grazing had similar effects on phytoplankton.
• Warming and increased zooplankton density decreased phytoplankton richness.
• Warming and increased zooplankton density increased phytoplankton evenness.

Recent climate warming is expected to affect phytoplankton biomass and diversity in marine ecosystems. Temperature can act directly on phytoplankton (e.g. rendering physiological processes) or indirectly due to changes in zooplankton grazing activity. We tested experimentally the impact of increased temperature on natural phytoplankton and zooplankton communities using indoor mesocosms and combined the results from different experimental years applying a meta-analytic approach. We divided our analysis into three bloom phases to define the strength of temperature and zooplankton impacts on phytoplankton in different stages of bloom development. Within the constraints of an experiment, our results suggest that increased temperature and zooplankton grazing have similar effects on phytoplankton diversity, which are most apparent in the post-bloom phase, when zooplankton abundances reach the highest values. Moreover, we observed changes in zooplankton composition in response to warming and initial conditions, which can additionally affect phytoplankton diversity, because changing feeding preferences of zooplankton can affect phytoplankton community structure. We conclude that phytoplankton diversity is indirectly affected by temperature in the post-bloom phase through changing zooplankton composition and grazing activities. Before and during the bloom, however, these effects seem to be overruled by temperature enhanced bottom-up processes such as phytoplankton nutrient uptake.

Document Type: Article
Additional Information: WOS:000329884700036
Keywords: Climate warming; Mesocosms; Plankton; Diversity
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.seares.2013.07.003
ISSN: 1385-1101
Projects: AQUASHIFT
Date Deposited: 12 Aug 2013 10:18
Last Modified: 19 Jul 2017 10:53
URI: http://oceanrep.geomar.de/id/eprint/21915

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