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Regionally and climatically restricted patterns of distribution of genetic diversity in a migratory bat species, Miniopterus schreibersii (Chiroptera: Vespertilionidae).

Bilgin R, Karataş A, Coraman E, Disotell T, Morales JC - BMC Evol. Biol. (2008)

Bottom Line: Our results showed differentiation in mitochondrial DNA coupled with weaker nuclear differentiation.We found evidence for restriction of lineages to geographical areas for hundreds of generations.The results showed that the most likely ancestral haplotype was restricted to the same geographic area (the Balkans) for at least 6,000 years.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Environmental Sciences, Boğaziçi University, Bebek 34342, Istanbul, Turkey. rasit.bilgin@boun.edu.tr

ABSTRACT

Background: Various mechanisms such as geographic barriers and glacial episodes have been proposed as determinants of intra-specific and inter-specific differentiation of populations, and the distribution of their genetic diversity. More recently, habitat and climate differences, and corresponding adaptations have been shown to be forces influencing the phylogeographic evolution of some vertebrates. In this study, we examined the contribution of these various factors on the genetic differentiation of the bent-winged bat, Miniopterus schreibersii, in southeastern Europe and Anatolia.

Results and conclusion: Our results showed differentiation in mitochondrial DNA coupled with weaker nuclear differentiation. We found evidence for restriction of lineages to geographical areas for hundreds of generations. The results showed that the most likely ancestral haplotype was restricted to the same geographic area (the Balkans) for at least 6,000 years. We were able to delineate the migration routes during the population expansion process, which followed the coasts and the inland for different nested mitochondrial clades. Hence, we were able to describe a scenario showing how multiple biotic and abiotic events including glacial periods, climate and historical dispersal patterns complemented each other in causing regional and local differentiation within a species.

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a) Bayesian skyline plot for clade S, including the 95% highest probability density interval. b) Bayesian skyline plot for clade P, including the 95% highest probability density interval.
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Figure 4: a) Bayesian skyline plot for clade S, including the 95% highest probability density interval. b) Bayesian skyline plot for clade P, including the 95% highest probability density interval.

Mentions: Given this pattern of star-like networks, indicative of population expansion, the significance of these patterns was checked through the statistics R2 and FS. As the AMOVA indicated a significant genetic break between clade S and clade P, the analyses were run separately for each clade. For clade S, both of these statistics, whose values were 0.0385 and -32.2963, respectively, indicated significant expansions, as the probability of getting values lower than these was < 0.01 (1000 replicates). For clade P, the pattern was a similar one of significant R2 and FS, whose values were 0.0880 (P < 0.05) and -4.8960 (P < 0.01), respectively. Also the frequency of pairwise nucleotide differences of haplotypes was plotted with expectations under a constant-size model and a model of range expansion. The plots for both clade S and P fit a range expansion model better than a constant size model (Figures 3a–d). The Bayesian skyline plots for clades S and P also showed patterns of population expansion, initiating around 15,000 (Figure 4a) and 5,500 (Figure 4b) years ago, respectively.


Regionally and climatically restricted patterns of distribution of genetic diversity in a migratory bat species, Miniopterus schreibersii (Chiroptera: Vespertilionidae).

Bilgin R, Karataş A, Coraman E, Disotell T, Morales JC - BMC Evol. Biol. (2008)

a) Bayesian skyline plot for clade S, including the 95% highest probability density interval. b) Bayesian skyline plot for clade P, including the 95% highest probability density interval.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2483726&req=5

Figure 4: a) Bayesian skyline plot for clade S, including the 95% highest probability density interval. b) Bayesian skyline plot for clade P, including the 95% highest probability density interval.
Mentions: Given this pattern of star-like networks, indicative of population expansion, the significance of these patterns was checked through the statistics R2 and FS. As the AMOVA indicated a significant genetic break between clade S and clade P, the analyses were run separately for each clade. For clade S, both of these statistics, whose values were 0.0385 and -32.2963, respectively, indicated significant expansions, as the probability of getting values lower than these was < 0.01 (1000 replicates). For clade P, the pattern was a similar one of significant R2 and FS, whose values were 0.0880 (P < 0.05) and -4.8960 (P < 0.01), respectively. Also the frequency of pairwise nucleotide differences of haplotypes was plotted with expectations under a constant-size model and a model of range expansion. The plots for both clade S and P fit a range expansion model better than a constant size model (Figures 3a–d). The Bayesian skyline plots for clades S and P also showed patterns of population expansion, initiating around 15,000 (Figure 4a) and 5,500 (Figure 4b) years ago, respectively.

Bottom Line: Our results showed differentiation in mitochondrial DNA coupled with weaker nuclear differentiation.We found evidence for restriction of lineages to geographical areas for hundreds of generations.The results showed that the most likely ancestral haplotype was restricted to the same geographic area (the Balkans) for at least 6,000 years.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Environmental Sciences, Boğaziçi University, Bebek 34342, Istanbul, Turkey. rasit.bilgin@boun.edu.tr

ABSTRACT

Background: Various mechanisms such as geographic barriers and glacial episodes have been proposed as determinants of intra-specific and inter-specific differentiation of populations, and the distribution of their genetic diversity. More recently, habitat and climate differences, and corresponding adaptations have been shown to be forces influencing the phylogeographic evolution of some vertebrates. In this study, we examined the contribution of these various factors on the genetic differentiation of the bent-winged bat, Miniopterus schreibersii, in southeastern Europe and Anatolia.

Results and conclusion: Our results showed differentiation in mitochondrial DNA coupled with weaker nuclear differentiation. We found evidence for restriction of lineages to geographical areas for hundreds of generations. The results showed that the most likely ancestral haplotype was restricted to the same geographic area (the Balkans) for at least 6,000 years. We were able to delineate the migration routes during the population expansion process, which followed the coasts and the inland for different nested mitochondrial clades. Hence, we were able to describe a scenario showing how multiple biotic and abiotic events including glacial periods, climate and historical dispersal patterns complemented each other in causing regional and local differentiation within a species.

Show MeSH