Effect of the landscape matrix on gene flow in a coastal amphibian metapopulation

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Functional connectivity is crucial for the persistence of a metapopulation, because migration among subpopulations enables recolonization and counteracts genetic drift, which is especially important in small subpopulations. We studied the degree and drivers of connectivity among occupied patches of a coastal dune metapopulation of the Natterjack Toad (Epidalea calamita Laurenti), on the basis of microsatellite variation. As spatial landscape heterogeneity is expected to influence dispersal and genetic structure, we analyzed which landscape features affect functional connectivity and to what extent. Sixty different landscape resistance scenarios as well as the isolation-by-distance model were compared using two landscape genetics approaches. We identified three subpopulations with unidirectional levels of gene flow among the two most geographically separated subpopulations, while inferred gene flow into the geographically intermediate subpopulation was limited. Urbanization and vegetation height negatively affected connectivity. Low estimates of genetic diversity and effective population size indicate that conservation measures in the smallest and most isolated subpopulation are required.
TaalEngels
TijdschriftConservation Genetics
Volume18
Exemplaarnummer6
Pagina's (van-tot)1359-1375
ISSN1566-0621
DOI's
StatusGepubliceerd - 2017

Thematische lijst

  • Ruimte

EWI Biomedische wetenschappen

  • B280-dierenecologie

Taxonomische lijst

  • amfibieën (Amphibia)
  • Epidalea calamita
  • Rugstreeppad

Geografische lijst

  • duinen
  • kust
  • West-Vlaanderen

Technologisch

  • genetische technieken
  • statistiek en modellering

Vrije trefwoorden

  • landschapsgenetica

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