Arid
DOI10.1007/s10592-007-9482-0
Molecular and phenotypic diversity in Chionactis occipitalis (Western Shovel-nosed Snake), with emphasis on the status of C-o. klauberi (Tucson Shovel-nosed Snake).
Wood, Dustin A.1; Meik, J. M.2; Holycross, A. T.3; Fisher, R. N.1; Vandergast, A. G.1
通讯作者Wood, Dustin A.
来源期刊CONSERVATION GENETICS
ISSN1566-0621
EISSN1572-9737
出版年2008
卷号9期号:6页码:1489-1507
英文摘要

Chionactis occipitalis (Western Shovel-nosed Snake) is a small colubrid snake inhabiting the arid regions of the Mojave, Sonoran, and Colorado deserts. Morphological assessments of taxonomy currently recognize four subspecies. However, these taxonomic proposals were largely based on weak morphological differentiation and inadequate geographic sampling. Our goal was to explore evolutionary relationships and boundaries among subspecies of C. occipitalis, with particular focus on individuals within the known range of C. o. klauberi (Tucson Shovel-nosed snake). Population sizes and range for C. o. klauberi have declined over the last 25 years due to habitat alteration and loss prompting a petition to list this subspecies as endangered. We examined the phylogeography, population structure, and subspecific taxonomy of C. occipitalis across its geographic range with genetic analysis of 1100 bases of mitochondrial DNA sequence and reanalysis of 14 morphological characters from 1543 museum specimens. We estimated the species gene phylogeny from 81 snakes using Bayesian inference and explored possible factors influencing genetic variation using landscape genetic analyses. Phylogenetic and population genetic analyses reveal genetic isolation and independent evolutionary trajectories for two primary clades. Our data indicate that diversification between these clades has developed as a result of both historical vicariance and environmental isolating mechanisms. Thus these two clades likely comprise evolutionary significant units’ (ESUs). Neither molecular nor morphological data are concordant with the traditional C. occipitalis subspecies taxonomy. Mitochondrial sequences suggest specimens recognized as C. o. klauberi are embedded in a larger geographic clade whose range has expanded from western Arizona populations, and these data are concordant with clinal longitudinal variation in morphology.


英文关键词Chionactis occipitalis mtDNA Sonoran desert Mojave Desert ESU Spatial genetic analysis
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000260539800009
WOS关键词GENE FLOW ; PHYLOGENETIC-RELATIONSHIPS ; REDUNDANCY ANALYSIS ; MITOCHONDRIAL-DNA ; CLIMATE-CHANGE ; NORTH-AMERICA ; CONSERVATION ; PHYLOGEOGRAPHY ; CONFIDENCE ; DISTANCE
WOS类目Biodiversity Conservation ; Genetics & Heredity
WOS研究方向Biodiversity & Conservation ; Genetics & Heredity
来源机构United States Geological Survey ; Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/156945
作者单位1.US Geol Survey, Western Ecol Res Ctr, San Diego Field Stn, San Diego, CA 92101 USA;
2.Univ Texas Arlington, Dept Biol, Arlington, TX 76019 USA;
3.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
推荐引用方式
GB/T 7714
Wood, Dustin A.,Meik, J. M.,Holycross, A. T.,et al. Molecular and phenotypic diversity in Chionactis occipitalis (Western Shovel-nosed Snake), with emphasis on the status of C-o. klauberi (Tucson Shovel-nosed Snake).[J]. United States Geological Survey, Arizona State University,2008,9(6):1489-1507.
APA Wood, Dustin A.,Meik, J. M.,Holycross, A. T.,Fisher, R. N.,&Vandergast, A. G..(2008).Molecular and phenotypic diversity in Chionactis occipitalis (Western Shovel-nosed Snake), with emphasis on the status of C-o. klauberi (Tucson Shovel-nosed Snake)..CONSERVATION GENETICS,9(6),1489-1507.
MLA Wood, Dustin A.,et al."Molecular and phenotypic diversity in Chionactis occipitalis (Western Shovel-nosed Snake), with emphasis on the status of C-o. klauberi (Tucson Shovel-nosed Snake).".CONSERVATION GENETICS 9.6(2008):1489-1507.
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