Genetic variability and gene flow in the globally, critically-endangered Taita thrush

被引：47

作者：

Galbusera P. ^{[1
]}

Lens L. ^{[1
,2
]}

Schenck T. ^{[1
]}

Waiyaki E. ^{[2
]}

Matthysen E. ^{[1
]}

机构：

[1] Laboratory of Animal Ecology, Department of Biology, University of Antwerp (UIA), B-2610 Wilrijk

[2] Department of Ornithology, National Museums of Kenya, Nairobi

来源：

Conservation Genetics | 2000年 / 1卷 / 1期

关键词：

Assignment test; Effective population size; Gene flow; Habitat fragmentation; Microsatellite DNA markers;

D O I：

10.1023/A:1010184200648

中图分类号：

学科分类号：

摘要：

Analysis of 155 individuals with seven polymorphic microsatellite DNA markers showed significant genetic differentiation between the only three remaining subpopulations of the globally, critically-endangered Taita thrush. Small, recently-disturbed subpopulations such as studied here may violate the assumptions of mutation-drift and gene flow-drift equilibrium inherent to most population genetic tools that estimate gene flow. We therefore identified putative dispersers using two recently-developed assignment tests based on individual genotypes. Previous-generation and current migration rates between any two subpopulations were estimated at one and zero individuals per generation, respectively. Strong congruence with non-genetic estimates of between-fragment dispersal provided indirect evidence for the accuracy of the assignment test. From a conservation perspective, the available demographic and genetic data suggest a substantial threat to the long-term survival of at least the smallest subpopulation.

引用

页码：45 / 55

页数：10