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CLONAL DIVERSITY IN HIGH-ARCTIC POPULATIONS OF DAPHNIA PULEX, A POLYPLOID APOMICTIC COMPLEX

Lawrence J. Weider

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

Address for correspondence: L. J. Weider, Abteilung Ökophysiologie, Max-Planck-Institut für Limnologie, Postfach 165, D-2320 Plön (Holstein), West Germany.Search for more papers by this author

Margaret J. Beaton,

Margaret J. Beaton

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

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Paul D. N. Hebert,

Paul D. N. Hebert

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

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Lawrence J. Weider,

Lawrence J. Weider

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

Address for correspondence: L. J. Weider, Abteilung Ökophysiologie, Max-Planck-Institut für Limnologie, Postfach 165, D-2320 Plön (Holstein), West Germany.Search for more papers by this author

Margaret J. Beaton,

Margaret J. Beaton

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

Search for more papers by this author

Paul D. N. Hebert,

Paul D. N. Hebert

Department of Biological Sciences, University of Windsor, Windsor, ON, N9B 3P4 Canada

Search for more papers by this author

First published: November 1987

https://doi.org/10.1111/j.1558-5646.1987.tb02471.x

Citations: 20

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Abstract

Based largely on analogy with latitudinal trends in species diversity, it has been proposed that levels of genotypic (clonal) diversity in parthenogenetic populations from high latitudes should be lower than those in populations from the temperate zone or the tropics.

Prior studies have shown that low-arctic populations of obligately asexual Daphnia pulex are less clonally diverse than temperate-zone populations. To test for the existence of a latitudinal trend, an allozymic survey of obligately parthenogenetic populations of D. pulex was conducted at a site in the Canadian high-arctic. The study revealed the presence of 75 clones in 179 tundra ponds that were surveyed. On average, 4.5 clones coexisted in single ponds with a range of 1–14 clones. These diversity values are as great (or greater) than those observed in more southerly populations and conflict with the notion of reduced levels of genetic variation in arctic populations. Mechanisms that may influence genetic (clonal) diversity in apomictic complexes are discussed.

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Volume41, Issue6

November 1987

Pages 1335-1346

CLONAL DIVERSITY IN HIGH-ARCTIC POPULATIONS OF DAPHNIA PULEX, A POLYPLOID APOMICTIC COMPLEX

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CLONAL DIVERSITY IN HIGH-ARCTIC POPULATIONS OF DAPHNIA PULEX, A POLYPLOID APOMICTIC COMPLEX

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