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JPR Advance Access published online on August 17, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbl033
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received October 25, 2005
Accepted August 11, 2006

Article

Linking lakes? The population genetic structure of Chaoborus flavicans

Thomas U. Berendonk 1 * and Ken Spitze 2

1 Max Planck Institute for Limnology, August Thienemann Str. 2, 24306 Plön, Germany and NERC Centre for Population Biology, Imperial College at Silwood Park, Ascot, Berkshire SL5 7PY, UK; Current address: University of Leipzig, Department of Biology II, Molecular Evolution and Systematics, Talstr. 33, 04103 Leipzig, Germany
2 Max Planck Institute for Limnology August Thienemann Str. 2, 24306 Plön, Germany

* To whom correspondence should be addressed.
Thomas U. Berendonk, E-mail: tberendonk{at}rz.uni-leipzig.de


  Abstract

Larvae of Chaoborus flavicans (Diptera: Chaoboridae) are common in a variety of lakes and are important members of plankton communities. In order to assess gene flow between lakes, several populations throughout Europe were sampled. To explicitly test if gene flow is higher within regions than between regions, four regions containing several populations each were examined. For a detailed analysis of regional gene flow, 12 populations within a region in North Germany were analyzed. Allozymes and mitochondrial RFLP were used to estimate the relative amounts of gene flow. Results indicate that most of the dispersal in C. flavicans takes place between lakes within regions. Therefore, the population genetic structure of C. flavicans sets this species apart from other planktonic organisms, which are mainly passive dispersers and display low gene flow between lakes within regions. Consequently, these data are the first evidence that C. flavicans may form an important link between lakes within regions. Local adaptation within lakes may be decreased due to these processes and the role of C. flavicans as a biomonitor of local lake conditions needs to be carefully reinvestigated.

Communicating Editor: KJ Flynn


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