当前位置: X-MOL 学术Conserv. Genet. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Genes in space: what Mojave desert tortoise genetics can tell us about landscape connectivity
Conservation Genetics ( IF 2.2 ) Pub Date : 2020-02-08 , DOI: 10.1007/s10592-020-01251-z
Kirsten E. Dutcher , Amy G. Vandergast , Todd C. Esque , Anna Mitelberg , Marjorie D. Matocq , Jill S. Heaton , Ken E. Nussear

Habitat loss and fragmentation in the Mojave desert have been increasing, which can create barriers to movement and gene flow in populations of native species. Disturbance and degradation of Mojave desert tortoise habitat includes linear features (e.g. highways, railways, a network of dirt roads), urbanized areas, mining activities, and most recently, utility-scale solar facilities. To evaluate the spatial genetic structure of tortoises in an area experiencing rapid habitat loss, we genotyped 299 tortoises at 20 microsatellite loci from the Ivanpah valley region along the California/Nevada border. We used a Bayesian clustering analysis to quantify population genetic structure across valley and mountain pass habitats. A spatial principal components analysis was used to further investigate patterns with isolation-by-distance. To explicitly consider landscape features (e.g. habitat and anthropogenic linear barriers), we used maximum likelihood population effects analyses. We quantified recent gene flow through relatedness using a maximum likelihood pedigree approach. We detected three genetic clusters that generally corresponded to valleys separated by mountains, with one genetically distinguishable population in a mountain pass. Pedigree analyses showed second order relationships up to 60 km apart suggesting a greater range of interactions and inter-relatedness than previously suspected. Our results support historical gene flow with isolation-by-resistance and reveal reduced genetic connectivity across two parallel linear features bisecting our study area (a railway and a highway). Our work demonstrates the potential for tortoises to use a range of habitats, spanning valleys to mountain passes, but also indicates habitat fragmentation limits connectivity with relatively rapid genetic consequences.



中文翻译:

太空中的基因:莫哈韦沙漠乌龟的遗传学能告诉我们有关景观连通性的信息

莫哈韦沙漠中的栖息地流失和破碎化现象一直在增加,这可能对原生物种种群的移动和基因流动造成障碍。莫哈韦沙漠乌龟栖息地的扰动和退化包括线性特征(例如,高速公路,铁路,土路网),城市化地区,采矿活动以及最近的公用事业规模的太阳能设施。为了评估栖息地迅速丧失的地区中乌龟的空间遗传结构,我们在加利福尼亚/内华达州边界的伊万帕谷地区的20个微卫星基因座上对299只乌龟进行了基因分型。我们使用贝叶斯聚类分析来量化整个山谷和山口栖息地的种群遗传结构。空间主成分分析用于进一步研究距离隔离模式。为了明确考虑景观特征(例如栖息地和人为线性障碍),我们使用了最大似然种群效应分析。我们使用最大似然谱系方法量化了通过相关性的最近基因流。我们检测到三个基因簇,通常对应于被山脉隔开的山谷,在一个山口中有一个遗传上可区分的种群。家谱分析显示,相隔60公里以内的二阶关系表明相互作用和相互关系的范围比以前怀疑的范围大。我们的结果通过抗性隔离支持了历史基因流,并揭示了将我们的研究区域(铁路和公路)一分为二的两个平行线性特征的遗传连通性降低。我们的工作表明,乌龟有可能利用各种栖息地,

更新日期:2020-04-20
down
wechat
bug