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Related Experiment Videos

Can assignment tests measure dispersal?

Oliver Berry1, Mandy D Tocher, Stephen D Sarre

  • 1Institute of Molecular BioSciences, Massey University, Palmerston North, New Zealand. berry@scides.canberra.edu.au

Molecular Ecology
|February 12, 2004
PubMed
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Assignment tests accurately identify natal dispersal in grand skinks, even with high gene flow. These genetic methods offer a faster, less labor-intensive alternative to traditional mark-and-recapture studies.

Area of Science:

  • Molecular ecology
  • Conservation genetics
  • Population dynamics

Background:

  • Individual-based assignment tests are key tools in molecular ecology for studying species dispersal.
  • Measuring natal dispersal is crucial for understanding population ecology, but the accuracy of assignment tests with high dispersal rates is not well understood.
  • The grand skink (Oligosoma grande) metapopulation in New Zealand experiences frequent interpopulation dispersal, making it an ideal model system.

Purpose of the Study:

  • To evaluate the accuracy of individual-based assignment tests in estimating natal dispersal in a wild metapopulation with high dispersal rates.
  • To compare the effectiveness of genetic assignment tests with traditional mark-and-recapture methods for tracking dispersal.
  • To assess the influence of different assignment methods and genetic parameters on accuracy.

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Main Methods:

  • Microsatellite DNA data were used for genetic assignment tests.
  • Assignment test results were compared against long-term mark-and-recapture data from four grand skink populations.
  • Accuracy was assessed based on correctly identified natal populations and estimated dispersal proportions.

Main Results:

  • Assignment tests accurately identified the natal population for 65-100% of individuals, even with 5-20% dispersers.
  • Genetic assignment provided estimates of dispersal proportions comparable to mark-and-recapture data.
  • Accuracy was influenced by assignment stringency, genetic differentiation, and the number of loci used.

Conclusions:

  • Individual-based assignment tests are reliable for studying natal dispersal, even in species with high interpopulation movement.
  • These genetic methods significantly reduce fieldwork effort compared to traditional approaches.
  • Assignment tests offer a valuable tool for both applied and theoretical ecological studies of dispersal.