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  Experimental evidence of a low-oxygen refuge for large zooplankton

Larsson, P., & Lampert, W. (2011). Experimental evidence of a low-oxygen refuge for large zooplankton. Limnology & Oceanography, 56(5), 1682-1688. doi:10.4319/lo.2011.56.5.1682.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D39A-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D39B-A
Genre: Journal Article

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Larsson+2011_L+O.56.1682.pdf (Publisher version), 580KB
 
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 Creators:
Larsson, Petter1, Author              
Lampert, Winfried2, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Emeritus Group Lampert, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445636              

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 Abstract: We tested the hypothesis that hypoxic zones in the metalimnion and hypolimnion of lakes can provide a refuge against fish predation for large zooplankton. Experiments were run in a large indoor mesocosm system (Plön Plankton Towers). We compared mortality rates of Daphnia pulicaria due to free-ranging fish in mesocosms with either oxic or hypoxic hypolimnia. In the presence of fish Daphnia moved down below the thermocline. Under hypoxic conditions their distribution peaked in the upper hypolimnion at a concentration of approximately 1 mg O2 L−1. In oxygen-saturated hypolimnia Daphnia were distributed evenly. The mortality rate of Daphnia in the hypoxic treatment was only one third of that in the oxic treatment. The hypoxic habitat provided a refuge, as Daphnia tolerated lower oxygen concentrations than did fish. However, there may be demographic costs associated with living in low-oxygen conditions. Hence, the importance of a hypoxic refuge under natural conditions will most likely depend on the trade-off between predation risk and cost of living in hypoxic waters.

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Language(s): eng - English
 Dates: 2011-09
 Publication Status: Published in print
 Pages: -
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 Identifiers: eDoc: 570680
DOI: 10.4319/lo.2011.56.5.1682
Other: 2845/S 39188
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Title: Limnology & Oceanography
  Alternative Title : Limnol. Oceanogr.
Source Genre: Journal
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Pages: - Volume / Issue: 56 (5) Sequence Number: - Start / End Page: 1682 - 1688 Identifier: ISSN: 0024-3590