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Chen W.,Natural History Museum of Guangxi | Chen W.,Sichuan University | Sun Z.,Sichuan Academy of Forestry | Liu Y.,Sichuan Academy of Forestry | And 2 more authors.
Mitochondrial DNA | Year: 2012

The first complete mitochondrial genome of the large white-bellied rat (Niviventer excelsior) was sequenced and annotated in order to provide a source of phylogenetic characters including an assessment of gene order arrangement. The mitochondrial genome sequence (16,298 bp) of N. excelsior contains 13 protein-coding, 2 rRNA and 22 tRNA genes as well as 1 typical control region (D-Loop), which are shared by other mammalian mitochondrial genomes. The codon usage also followed the typical vertebrate pattern except for an unusual CCA stop codon, which was termination codon of Cyt b. The 16 nucleotide insertion was detected in the central conserved domain of d-Loop. The 12 heavy-strand encoded protein-coding genes were used to reconstruct the phylogenetic relationships by the Bayesian inference and maximum likelihood methods. Topologies revealed that N. excelsior clustered together with the species in genus Rattus, indicating their closer phylogenetic relationship. © 2012 Informa UK, Ltd. Source


Zhang Y.,Guangxi Botanical Garden of Medicinal Plants | Chen C.,Nanning Zoo | Li L.,Guangxi Botanical Garden of Medicinal Plants | Zhao C.,Guangxi Botanical Garden of Medicinal Plants | And 2 more authors.
Ecology and Evolution | Year: 2014

The black-spotted tokay and the red-spotted tokay are morphologically distinct and have largely allopatric distributions. The black-spotted tokay is characterized by a small body size and dark skin with sundry spots, while the red-spotted tokay has a relatively large body size and red spots. Based on morphological, karyotypic, genetic, and distribution differences, recent studies suggested their species status; however, their classifications remain controversial, and additional data such as ecological niches are necessary to establish firm hypotheses regarding their taxonomic status. We reconstructed their ecological niches models using climatic and geographic data. We then performed niche similarity tests (niche identity and background tests) and point-based analyses to explore whether ecological differentiation has occurred, and whether such differences are sufficient to explain the maintenance of their separate segments of environmental ranges. We found that both niche models of the black- and the red-spotted tokay had a good fit and a robust performance, as indicated by the high area under the curve (AUC) values ("black" = 0.982, SD = ± 0.002, "red" = 0.966 ± 0.02). Significant ecological differentiation across the entire geographic range was found, indicating that the involvement of ecological differentiation is important for species differentiation. Divergence along the environmental axes is highly associated with climatic conditions, with isothermality being important for the "black" form, while temperature seasonality, precipitation of warmest quarter, and annual temperature range together being important for the "red" form. These factors are likely important factors in niche differentiation between the two forms, which result in morphological replacement. Overall, beside morphological and genetic differentiation information, our results contribute to additional insights into taxonomic distinction and niche differentiation between the black- and the red-spotted tokay. © 2014 The Authors. Source


Nishikawa K.,Kyoto University | Jiang J.-P.,CAS Chengdu Institute of Biology | Matsui M.,Kyoto University | Mo Y.-M.,Natural History Museum of Guangxi
Zoological Science | Year: 2011

Examination of the lectotype and paralectotypes of Pachytriton labiatus (Unterstein, 1930) from southern China revealed that the specimens do not represent a member of Pachytriton, but are identical with a newt of another genus, Paramesotriton ermizhaoi Wu et al., 2009 also described from southern China. We suggest that Pac. labiatus should be transferred to Paramesotriton as a senior synonym of Par. ermizhaoi. We compared the morphology of the northeastern and southwestern groups of newts previously called Pac. labiatus with special reference to age and sexual variations. As a result, we confirmed that the two groups are differentiated sufficiently to be treated as different species. In this report, we revive the name Pac. granulosus Chang, 1933 to refer to the northeastern group of Pac. labiatus and at the same time, describe a new species representing the southwestern group. © 2011 Zoological Society of Japan. Source


Mo J.,Natural History Museum of Guangxi | Zhou F.,Guangxi Institute of Regional Geological Survey | Li G.,Guangxi Institute of Regional Geological Survey | Huang Z.,Guangxi Institute of Regional Geological Survey | Cao C.,Guangxi Institute of Regional Geological Survey
Acta Geologica Sinica | Year: 2014

A new large-bodied theropod dinosaur, Datanglong guangxiensis gen. et sp. nov., was recovered from the Lower Cretaceous Xinlong Formation of the Datang Basin, Guangxi. It is unique in several features including: posteriormost dorsal vertebra with teardrop-shaped pneumatic foramen confined by enlarged pcdl, acpl and the centrum; posteriormost dorsal with well-developed, horizontal prpl; posteriormost dorsal with a parapophysis projecting more laterally than the diapophysis; brevis fossa shallow with short, ridge-like medial blade; and iliac pubic peduncle with posteroventrally expanded margin. Cladistic analysis supports the idea that this new taxon Datanglong guangxiensis is a primitive member of the Carcharodontosauria in possessing two unambiguous synapomorphies: large external pneumatic foramina and internal spaces present in the lateral surface of ilium, and a peg-and-socket ischiac articulation with the ilium. The presence of the new taxon from Guangxi further confirms that Carcharodontosauria were cosmopolitan large-bodied predators during the Early-mid Cretaceous. © 2014 Geological Society of China. Source


Bei Y.,Anhui University | Bei Y.,Yulin Normal University | Chen W.,Natural History Museum of Guangxi | Sun B.,Anhui University | And 4 more authors.
Biochemical Systematics and Ecology | Year: 2014

Genetic diversity plays a vital role in biological conservation, especially for those species under the threat of habitat loss and fragmentation. In this study, 73 samples of Hume's pheasant (Syrmaticus humiae), collected from 6 localities in Guangxi and Guizhou provinces of China, were used to examine the influences of habitat fragmentation on genetic diversity and structure based on 1143bp sequence of mitochondrial DNA (D-Loop). The results showed that all populations expressed high genetic diversity while lacking genetic differentiation. Phylogenetic analyses suggested that the haplotypes identified from the four putative populations (TXL, LX, PJ and LD) did not cluster into separate geographic branches. Despite habitat fragmentation, we failed to find evidence of genetic depletion or impediment of gene flow within the 6 localities. Therefore, the four geographical populations should be regarded as an identical management unit (MU). Based on our results, we suggest that habitat restoration and hunting prohibition for protection should be highlighted for the increased conservation of the Hume's pheasant. © 2014. Source

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