Journal
JOURNAL OF SYSTEMATICS AND EVOLUTION
Volume 60, Issue 6, Pages 1358-1370Publisher
WILEY
DOI: 10.1111/jse.12820
Keywords
biodiversity hotspot; genetic diversity; isolation by distance; mitochondrial DNA; Rhizomys pruinosus; simple sequence repeat
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Funding
- Key Laboratory of Yunnan Province Universities of the Diversity and Ecological Adaptive Evolution for Animals and Plants on Yungui Plateau
- National Natural Science Foundation of China [31760103, 31260087, 31460561, 31660680]
- Yunnan Applied Basic Research Projects [2018FB050]
- Ten-Thousand Talents program of Yunnan Province
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This study assessed the impact factors on genetic diversity and diversification patterns of the hoary bamboo rat in the southwest mountainous region of China. The results suggested that fragmented mountainous habitats and Pleistocene climate changes were the main drivers of diversification in this species.
The southwest mountainous region of China has been characterized as one of the worldwide biodiversity hotspots, but mechanisms underlying diversification of organisms in this region are still not clear. We assessed whether fragmented mountainous habitats and Pleistocene climate changes impacted the genetic diversity and diversification patterns of the hoary bamboo rat (Rhizomys pruinosus Blyth), a widely distributed species of rodent in SW China. Genetic diversity analyses were undertaken based on four mitochondrial DNA regions and 12 nuclear microsatellite loci (simple sequence repeats), representing 153 individuals from 24 populations across SW China. Moreover, we investigated correlations between genotype and geographical components, and predicted species distribution models for R. pruinosus under the historical and present climate conditions. Both mitochondrial DNA and simple sequence repeat markers revealed substantial genetic diversity and strong differentiation between populations. Phylogeographical analyses revealed two phylogenetic clades that were consistent with their geographical distributions (eastern and western clades). We inferred that the divergence of R. pruinosus was largely driven by Quaternary climatic oscillations and regionally fragmented mountainous habitats with environmental and geographical heterogeneity. Overall, our study revealed diversification patterns of R. pruinosus-patterns that may be shared by small alpine vertebrates in SW China.
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