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  Salinity tolerance in Daphnia magna: characteristics of genotypes hatching from mixed sediments

Ortells, R., Reusch, T. B. H., & Lampert, W. (2005). Salinity tolerance in Daphnia magna: characteristics of genotypes hatching from mixed sediments. Oecologia, 143, 509-516. doi:10.1007/s00442-005-0027-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DA0E-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DA0F-1
Genre: Journal Article

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Ortells_2005.pdf (Publisher version), 313KB
 
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 Creators:
Ortells, Raquel1, Author              
Reusch, Thorsten B. H.1, 2, Author              
Lampert, Winfried1, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              

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Free keywords: cladocerans; microsatellites; resting egg banks; shallow lakes; zooplankton
 Abstract: The hatching of diapausing eggs is a means of temporal dispersal that can provide populations with genotypes adapted to different environments. In a salinity-variable shallow lake, we predicted that the mixing of different age-classes of eggs in the sediment may yield genotypes with different salinity optima. The alternative would be the absence of local adaptation and the presence of a homogenous population of salt-tolerant genotypes with high phenotypic plasticity. We tested these alternatives by isolating Daphnia magna resting eggs from different sediment depths, exposing them to hatching cues at different salinity levels and measuring the performance of hatched individuals. Results revealed a homogeneous sediment with generally broad-tolerance genotypes and some genotypes with low salt tolerance, which supports the second hypothesis. However, the disturbed character of the sediment hampered historical reconstruction. The absence of local adaptation in the diapausing egg bank may be the result of various scenarios in the response of D. magna populations to severe salinity changes in the lake.

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Language(s): eng - English
 Dates: 2005
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: eDoc: 226682
DOI: 10.1007/s00442-005-0027-2
Other: 2384/S 38367
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Title: Oecologia
Source Genre: Journal
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Pages: - Volume / Issue: 143 Sequence Number: - Start / End Page: 509 - 516 Identifier: ISSN: 0029-8549