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  Exploitation of a deep-water algal maximum by Daphnia: a stable-isotope tracer study

Lampert, W., & Grey, J. (2003). Exploitation of a deep-water algal maximum by Daphnia: a stable-isotope tracer study. Aquatic Biodiversity, 95-101.

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 Creators:
Lampert, Winfried1, Author           
Grey, Jonathan1, Author           
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: deep-water chlorophyll maximum; habitat selection; Daphnia; vertical distribution; stable isotopes; feeding
 Abstract: The exploitation of a deep algal maximum by Daphnia in the absence of fish predation was studied in large indoor mesocosms. Facing the dilemma of low food but high temperature in the epilimnion vs. high food but low temperature in the hypolimnion, Daphnia distribute above and below the thermocline in order to optimise their fitness. Labelling hypolimnetic algae with N-15 revealed that the vertical distribution of Daphnia is dynamic, i.e., all individuals traverse the thermocline and allocate a certain proportion of their time to feeding in the cold water. The overall energy gain from the deep-water algal maximumis lower than from the same algal concentration in the epilimnion due to the low temperature and the limited time an individual spends in the hypolimnion. The results provide mechanistic support for the hypothesis that Daphnia chose their habitat according to an Ideal Free Distribution with Costs model.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 39128
Other: 2217/S 37951
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Title: Aquatic Biodiversity
Source Genre: Issue
 Creator(s):
Martens, K., Editor
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 95 - 101 Identifier: -

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Title: Hydrobiologia
Source Genre: Journal
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Pages: - Volume / Issue: 500 Sequence Number: - Start / End Page: - Identifier: ISSN: 0018-8158