ISSN:
1572-9737
Keywords:
assignment test
;
effective population size
;
gene flow
;
habitat fragmentation
;
microsatellite DNA markers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1010184200648
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