Genetic variability and gene flow in the globally, critically-endangered Taita thrush |
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Authors: | Peter Galbusera Luc Lens Tine Schenck Edward Waiyaki Erik Matthysen |
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Affiliation: | (1) Laboratory of Animal Ecology, Department of Biology, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium;;(2) Laboratory of Animal Ecology, Department of Biology, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium;;(3) Department of Ornithology, National Museums of Kenya, PO Box 40658, Nairobi, Kenya |
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Abstract: | Analysis of 155 individuals with seven polymorphicmicrosatellite DNA markers showed significant genetic differentiationbetween the only three remaining subpopulations of the globally,critically-endangered Taita thrush. Small, recently-disturbedsubpopulations such as studied here may violate the assumptions ofmutation-drift and gene flow-drift equilibrium inherent to mostpopulation genetic tools that estimate gene flow. We thereforeidentified putative dispersers using two recently-developed assignmenttests based on individual genotypes. Previous-generation and currentmigration rates between any two subpopulations were estimated at one andzero individuals per generation, respectively. Strong congruence withnon-genetic estimates of between-fragment dispersal provided indirectevidence for the accuracy of the assignment test. From a conservationperspective, the available demographic and genetic data suggest asubstantial threat to the long-term survival of at least the smallestsubpopulation. |
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Keywords: | assignment test effective population size gene flow habitat fragmentation microsatellite DNA markers |
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