The Ecology of Dispersal in Relation to Conservation

  • Lennart Hansson
  • Lars Söderström
  • Christer Solbreck
Part of the Conservation Ecology Series: Principles, Practices and Management book series (PPM)


Small populations easily become extinct (Goodman, 1987). Small populations may also be affected by genetic drift and inbreeding (Schonewald Cox et al, 1983), although the importance of these latter effects on population dynamics is less clear (Ehrlich, 1983; Shaffer, 1987; see also chapter 4). The adverse demographic and genetic processes in small populations are both counteracted by immigration. Such immigration should keep the density over a certain threshold level (Brown & Kodric–Brown, 1977) or supply at least one reproducing individual per generation (Schonewald–Cox et al., 1983) to circumvent extinction or loss of genetic variability. However, immigration of foreign competing or predating species may have negative effects on local and circumscribed communities (Helle & Järvinen, 1986).


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Copyright information

© Elsevier Science Publishers Ltd 1992

Authors and Affiliations

  • Lennart Hansson
    • 1
  • Lars Söderström
    • 2
  • Christer Solbreck
    • 3
  1. 1.Department of Wildlife EcologySwedish University of Agricultural SciencesUppsalaSweden
  2. 2.Department of Plant EcologyUniversity of UmeåUmeåSweden
  3. 3.Department of Plant and Forest ProtectionSwedish University of Agricultural SciencesUppsalaSweden

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