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Historical connectivity, contemporary isolation and local adaptation in a widespread but discontinuously distributed species endemic to Taiwan, Rhododendron oldhamii (Ericaceae)
- Source :
- Heredity. 111:147-156
- Publication Year :
- 2013
- Publisher :
- Springer Science and Business Media LLC, 2013.
-
Abstract
- Elucidation of the evolutionary processes that constrain or facilitate adaptive divergence is a central goal in evolutionary biology, especially in non-model organisms. We tested whether changes in dynamics of gene flow (historical vs contemporary) caused population isolation and examined local adaptation in response to environmental selective forces in fragmented Rhododendron oldhamii populations. Variation in 26 expressed sequence tag-simple sequence repeat loci from 18 populations in Taiwan was investigated by examining patterns of genetic diversity, inbreeding, geographic structure, recent bottlenecks, and historical and contemporary gene flow. Selection associated with environmental variables was also examined. Bayesian clustering analysis revealed four regional population groups of north, central, south and southeast with significant genetic differentiation. Historical bottlenecks beginning 9168–13,092 years ago and ending 1584–3504 years ago were revealed by estimates using approximate Bayesian computation for all four regional samples analyzed. Recent migration within and across geographic regions was limited. However, major dispersal sources were found within geographic regions. Altitudinal clines of allelic frequencies of environmentally associated positively selected outliers were found, indicating adaptive divergence. Our results point to a transition from historical population connectivity toward contemporary population isolation and divergence on a regional scale. Spatial and temporal dispersal differences may have resulted in regional population divergence and local adaptation associated with environmental variables, which may have played roles as selective forces at a regional scale.
- Subjects :
- Gene Flow
Reproductive Isolation
Rhododendron
Population
Adaptation, Biological
Taiwan
Environment
Biology
Gene flow
Genetic drift
Genetics
education
Genetics (clinical)
Local adaptation
Expressed Sequence Tags
education.field_of_study
Genetic diversity
Habitat fragmentation
Plant Dispersal
Ecology
Genetic Drift
Genetic Variation
Bayes Theorem
Sequence Analysis, DNA
Biological Evolution
Phylogeography
Evolutionary biology
Multigene Family
Biological dispersal
Original Article
Microsatellite Repeats
Subjects
Details
- ISSN :
- 13652540 and 0018067X
- Volume :
- 111
- Database :
- OpenAIRE
- Journal :
- Heredity
- Accession number :
- edsair.doi.dedup.....88ce43719b17b1545ef5f7db2cf80f6d