Microsatellite analysis reveals interpopulation differentiation and gene flow in the endangered tree Changiostyrax dolichocarpa (Styracaceae) with fragmented distribution in central China

Polymorphic simple sequence repeat (SSR) markers were used to investigate the impact of habitat fragmentation on the population structure and gene flow of Changiostyrax dolichocarpa, a critically endangered tree in central China. Intrapopulation genetic diversity, population structure and gene flow...

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Bibliographic Details
Published in:The New phytologist 2007-01, Vol.176 (2), p.472-480
Main Authors: Yao, Xiaohong, Ye, Qigang, Kang, Ming, Huang, Hongwen
Format: Article
Language:English
Subjects:
Alleles
Bayes Theorem
Changiostyrax dolichocarpa
China
conservation
Conservation biology
Conservation of Natural Resources
Ecological genetics
Extinction, Biological
Gene Flow
Genetic diversity
Genetic loci
Genetic variation
habitat fragmentation
microsatellite markers
Microsatellite Repeats
Minisatellite Repeats
natural resource management
Polymorphism, Genetic
Population Density
Population Dynamics
Population ecology
Population estimates
Population genetics
Population structure
Styracaceae
Styracaceae - genetics
Styracaceae - growth & development
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Summary:Polymorphic simple sequence repeat (SSR) markers were used to investigate the impact of habitat fragmentation on the population structure and gene flow of Changiostyrax dolichocarpa, a critically endangered tree in central China. Intrapopulation genetic diversity, population structure and gene flow in the five extant populations of this species were analysed by eight SSR markers. Intrapopulation genetic diversity results suggest that C. dolichocarpa remnants maintained a relatively high degree of genetic diversity despite severe fragmentation. Low genetic differentiation among populations was found based on Wright's FST and amova analysis. Both the FST-based estimate and private allele method revealed high historical gene flow among the remnant populations. Recent immigrants, detected by assignment tests, tend to decrease from the grandparent generation to the current generation. The potentially highly restricted current gene flow among fragments may render the fragmented populations of C. dolichocarpa at a higher risk of local extinction several generations after fragmentation. Both in situ and ex situ conservation management for the remnant populations of C. dolichocarpa are therefore urgently needed to rescue remaining genetic diversity.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.2007.02175.x