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  Living with constraints - food quality effects on zooplankton

Becker, C. (2004). Living with constraints - food quality effects on zooplankton. PhD Thesis, Christian-Albrechts-Universität, Kiel.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-DAE1-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-DAE2-3
Genre: Thesis

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 Creators:
Becker, Claes1, Author           
Boersma, Maarten1, Advisor           
Sommer, Ulrich1, Referee           
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: Daphnia; Copepod; food quality; fatty acid; phosphorus; life-history; mesocosm; stoichiometry
 Abstract: Copepods and daphniids exhibit different grazing patterns, which affect the seston size distribution. I have studied whether the grazing of one guild could be beneficial for the other guild. Daphniids grew faster on seston previous manipulated by copepods than on seston which was not manipulated. Seston manipulated by daphniids was a poor food source for Daphnia and thus, growth declined. When marine copepods were feeding on plankton previously manipulated by copepods their growth potential (RNA:DNA) decreased with increasing copepod densities. In the laboratory I studied the effect of fatty acids and phosphorus (P) on Daphnia magna life-history and stoichiometry. D. magna had low EPA saturation threshold for growth (0.04 µg EPA L-1) and high storage capacity. However for P, daphniids had high requirements but only small storage capacity. P storage could not be utilised, whereas EPA storage could compensate periods of poor food quality.

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Language(s): eng - English
 Dates: 2004-05-04
 Publication Status: Accepted / In Press
 Pages: 113 Bl.
 Publishing info: Kiel : Christian-Albrechts-Universität
 Table of Contents: Introduction 3
1 Resources and growth – general limitations 3
2 Food quality 4
3 The study organisms 9
4 Hypotheses 12
5 Thesis outline 13
Chapters
I Differential impacts of copepods and cladocerans on lake seston, 17
and resulting effects on zooplankton growth
II Impacts of copepods on marine seston, and resulting effects on 35
Calanus finmarchicus RNA:DNA ratios
III Resource quality effects on life histories of Daphnia 54
IV Differential impacts of phosphorus and fatty acids on Daphnia 69
growth and reproduction
V Discussion 91
Summary 98
Zusammenfassung 101
References 104
Acknowledgement 111
Curriculum vitae 112
Erklärung 113
 Rev. Type: -
 Identifiers: eDoc: 122748
Other: Diss/10978
URI: http://e-diss.uni-kiel.de/diss_1059/
 Degree: PhD

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