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2015 ; 15
(ä): 289
Nephropedia Template TP
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English Wikipedia
Geologic events coupled with Pleistocene climatic oscillations drove genetic
variation of Omei treefrog (Rhacophorus omeimontis) in southern China
#MMPMID26690899
Li J
; Zhao M
; Wei S
; Luo Z
; Wu H
BMC Evol Biol
2015[Dec]; 15
(ä): 289
PMID26690899
show ga
BACKGROUND: Pleistocene climatic oscillations and historical geological events
may both influence current patterns of genetic variation, and the species in
southern China that faced unique climatic and topographical events have complex
evolutionary histories. However, the relative contributions of climatic
oscillations and geographical events to the genetic variation of these species
remain undetermined. To investigate patterns of genetic variation and to test the
hypotheses about the factors that shaped the distribution of this genetic
variation in species of southern China, mitochondrial genes (cytochrome b and
NADH dehydrogenase subunit 2) and nine microsatellite loci of the Omei tree frog
(Rhacophorus omeimontis) were amplified in this study. RESULTS: The genetic
diversity in the populations of R. omeimontis was high. The phylogenetic trees
reconstructed from the mitochondrial DNA (mtDNA) haplotypes and the Bayesian
genetic clustering analysis based on microsatellite data both revealed that all
populations were divided into three lineages (SC, HG and YN). The two most recent
splitting events among the lineages coincided with recent geological events
(including the intense uplift of the Qinghai-Tibet Plateau, QTP and the
subsequent movements of the Yun-Gui Plateau, YGP) and the Pleistocene
glaciations. Significant expansion signals were not detected in mismatch analyses
or neutrality tests. And the effective population size of each lineage was stable
during the Pleistocene. CONCLUSIONS: Based on the results of this study, complex
geological events (the recent dramatic uplift of the QTP and the subsequent
movements of the YGP) and the Pleistocene glaciations were apparent drivers of
the rapid divergence of the R. omeimontis lineages. Each diverged lineages
survived in situ with limited gene exchanges, and the stable demographics of
lineages indicate that the Pleistocene climatic oscillations were inconsequential
for this species. The analysis of genetic variation in populations of R.
omeimontis contributes to the understanding of the effects of changes in climate
and of geographical events on the dynamic development of contemporary patterns of
genetic variation in the species of southern China.