NDLI: The influence of autotrophy, heterotrophy and temperature on pelagic food web efficiency in a brackish water system

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The influence of autotrophy, heterotrophy and temperature on pelagic food web efficiency in a brackish water system

Content Provider	Springer Nature Link
Author	Dahlgren, Kristin Eriksson Wiklund, Ann Kristin Andersson, Agneta
Copyright Year	2011
Abstract	Climate change has been suggested to lead to higher temperature and increased heterotrophy in aquatic systems. The aim of this study was to test how these two factors affect metazooplankton and food web efficiency (FWE was defined as metazooplankton production divided by basal production). We tested the following hypotheses: (1) that lower metazooplankton production and lower FWE would be found in a food web based on heterotrophic production (bacteria) relative to one based on autotrophic production (phytoplankton), since the former induces a larger number of trophic levels; (2) the metazooplankton in the heterotrophic food web would contain less essential fatty acids than those from the autotrophic food web; and (3) that higher temperature would lead to increased FWE. To test these hypotheses, a mesocosm experiment was established at two different temperatures (5 and 10°C) with a dominance of either autotrophic (NP) or heterotrophic basal production (CNP). Metazooplankton production increased with temperature, but was not significantly affected by differences in basal production. However, increased heterotrophy did lead to decreased fatty acid content and lower individual weight in the zooplankton. FWE increased with autotrophy and temperature in the following order: 5CNP < 10CNP < 5NP < 10NP. Our results indicate that in the climate change scenario we considered, the temperature will have a positive effect on FWE, whereas the increase in heterotrophy will have a negative effect on FWE. Furthermore, the quality and individual weight of the metazooplankton will be reduced, with possible negative effects on higher trophic levels.
Starting Page	307
Ending Page	323
Page Count	17
File Format	PDF
ISSN	13862588
Journal	Aquatic Ecology
Volume Number	45
Issue Number	3
e-ISSN	15735125
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-03-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pelagic food web efficiency Food quality Climate change Baltic Sea Ecosystems Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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