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Conservation Genetics

, Volume 10, Issue 1, pp 87–99 | Cite as

Identification of conservation units in the European Mergus merganser based on nuclear and mitochondrial DNA markers

  • Barbara Hefti-Gautschi
  • Monika Pfunder
  • Lukas Jenni
  • Verena Keller
  • Hans Ellegren
Research Article

Abstract

The conservation status of small breeding areas of the Goosander (Mergus merganser merganser) in Central Europe is unclear. Geographic isolation of these areas suggests restricted gene flow to and from large North-European populations. On the other hand, migrating Goosanders from northern Europe join the Central European breeding population for wintering. To evaluate the conservation status of the small breeding areas we assessed the genetic structure of M. merganser populations in Europe by examining two nuclear marker systems (microsatellites and Single Nucleotide Polymorphisms, SNP) and mitochondrial (mtDNA) control region sequence variation for Goosanders in 11 sampling areas representing three of five distinct breeding areas and two subspecies (M. m. merganser and M. m. americanus). Overall population differentiation estimates including both subspecies were high, both based on mtDNA (\(\Upphi_{\rm ST}=0.899;\,P<0.0001\)) and nuclear markers (θ ST = 0.219; 95% CI 0.088–0.398, SNP and microsatellites combined). Within Europe, mtDNA revealed a strong overall (\(\Upphi_{\rm ST}=0.426;\,P<0.0001\)) and significant pairwise population differentiation between almost all comparisons. In contrast, both nuclear marker systems combined revealed only a small overall genetic differentiation (θ ST = 0.022; 95% CI 0.003–0.041). The strong genetic differentiation based on female-inherited mtDNA but not on biparentally inherited nuclear markers can be explained by sex-biased dispersal and strong female philopatry. Therefore, small breeding areas in Europe are endangered despite large male-mediated gene-flow, because when these populations decline, only males—but due to strong philopatry not females—can be efficiently supplemented by migration from the large North European populations. We therefore propose to manage the small breeding areas independently and to strengthen conservation efforts for this species in Central Europe.

Keywords

Female philopatry Microsatellite mtDNA Population structure SNP 

Notes

Acknowledgements

We would like to thank Adrian Aebischer, Åke Andersson, Johannes Bang, Michel Beaud, Bjørn-Aksel Bjerke, Peter Blaser, Bruno Blum, Ronald Bryant, Bernard Büttiker, Hans Englund, Jean-Marc Fivat, Michael Grell, Alan Hanson, Martti Hario, Pierre Henrioux, Josef Hofer, Leo Hüppin, Esbjörn Johansson, Kaarel Kaisel, Jan T. Lifjeld (Zoological Museum in Oslo), Bernard Lugrin, Matti Luostarinen, Theo Marbot-Monbaron, Alfred Mischler, Adam Mohr, Juhana and Pekka Niittylä, Sven Nilsson, Bertil Österberg, Pascal Rapin, Bernard Reymond, Aevar Petersen (Icelandic Institute of Natural History in Reykjavik), Hubert J. du Plessix, Runko Pnetti, Walter Schaub, Norman Seqmour Schmucki, Marco Zenatello, and Heribert Zintl for providing samples. This work was supported by the foundation “Dr. Joachim De Giacomi” of the Swiss Academy of Sciences (SCNAT), by the Swiss Federal Office for the Environment (FOEN), and by a postdoctoral fellowship from the Swiss National Science Foundation to BHG.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Barbara Hefti-Gautschi
    • 1
    • 2
  • Monika Pfunder
    • 1
  • Lukas Jenni
    • 3
  • Verena Keller
    • 3
  • Hans Ellegren
    • 2
  1. 1.Ecogenics GmbHZurich-SchlierenSwitzerland
  2. 2.Department of Evolutionary Biology, Evolutionary Biology CentreUppsala UniversityUppsalaSweden
  3. 3.Swiss Ornithological InstituteSempachSwitzerland

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