Parentage assignment detects frequent and large-scale dispersal in water voles

S Telfer*, SB Piertney, JF Dallas, WA Stewart, F Marshall, JL Gow, X Lambin

*Corresponding author for this work

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Estimating the rate and scale of dispersal is essential for predicting the dynamics of fragmented populations, yet empirical estimates are typically imprecise and often negatively biased. We maximized detection of dispersal events between small, subdivided populations of water voles (Arvicola terrestris) using a novel method that combined direct capture-mark-recapture with microsatellite genotyping to identify parents and offspring in different populations and hence infer dispersal. We validated the method using individuals known from trapping data to have dispersed between populations. Local populations were linked by high rates of juvenile dispersal but much lower levels of adult dispersal. In the spring breeding population, 19% of females and 33% of males had left their natal population of the previous year. The average interpopulation dispersal distance was 1.8 km (range 0.3-5.2 km). Overall, patterns of dispersal fitted a negative exponential function. Information from genotyping increased the estimated rate and scale of dispersal by three- and twofold, respectively, and hence represents a powerful tool to provide more realistic estimates of dispersal parameters.

Original languageEnglish
Pages (from-to)1939-1949
Number of pages11
JournalMolecular Ecology
Volume12
Issue number7
Early online date27 May 2003
DOIs
Publication statusPublished - Jul 2003

Keywords

  • Arvicola
  • dispersal
  • gene flow
  • metapopulation
  • microsatellite
  • water vole
  • arvicola-terrestris
  • metapopulation dynamics
  • multilocus genotypes
  • population-structure
  • natural-populations
  • model
  • immigration
  • individuals
  • persistence

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