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  Daphnia versus copepod impact on summer phytoplankton: functional compensation at both trophic levels

Sommer, U., Sommer, F., Santer, B., Zöllner, E., Jürgens, K., Jamieson, C., et al. (2003). Daphnia versus copepod impact on summer phytoplankton: functional compensation at both trophic levels. Oecologia, 135(4), 639-647. doi:10.1007/s00442-003-1214-7.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DBDA-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DBDB-D
Genre: Journal Article

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 Creators:
Sommer, Ulrich1, Author              
Sommer, Frank, Author
Santer, Barbara1, Author              
Zöllner, Eckart1, Author              
Jürgens, Klaus1, Author              
Jamieson, Colleen1, Author              
Boersma, Maarten1, Author              
Gocke, Klaus, Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: phytoplankton; zooplankton; copepoda; cladocera; top-down- control
 Abstract: Here we report on a mesocom study performed to compare the top- down impact of microphagous and macrophagous zooplankton on phytoplankton. We exposed a species-rich, summer phytoplankton assemblage from the mesotrophic Lake Schohsee (Germany) to logarithmically scaled abundance gradients of the microphagous cladoceran Daphnia hyalinaxgaleata and of a macrophagous copepod assemblage. Total phytoplankton biomass, chlorophyll a and primary production showed only a weak or even insignificant response to zooplankton density in both gradients. In contrast to the weak responses of bulk parameters, both zooplankton groups exerted a strong and contrasting influence on the phytoplankton species composition. The copepods suppressed large phytoplankton, while nanoplanktonic algae increased with increasing copepod density. Daphnia suppressed small algae, while larger species compensated in terms of biomass for the losses. Autotrophic picoplankton declined with zooplankton density in both gradients. Gelatinous, colonial algae were fostered by both zooplankton functional groups, while medium- sized (ca. 3,000 mum(3)), non-gelatinous algae were suppressed by both. The impact of a functionally mixed zooplankton assemblage became evident when Daphnia began to invade and grow in copepod mesocosms after ca. 10 days. Contrary to the impact of a single functional group, the combined impact of both zooplankton groups led to a substantial decline in total phytoplankton biomass.

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Language(s): eng - English
 Dates: 2003-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 35005
ISI: 000183722700019
DOI: 10.1007/s00442-003-1214-7
Other: 2205/S 37939
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Title: Oecologia
  Alternative Title : Oecologia
Source Genre: Journal
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Pages: - Volume / Issue: 135 (4) Sequence Number: - Start / End Page: 639 - 647 Identifier: ISSN: 0029-8549