Demographic and phylogeographic histories of two venomous North American snakes of the genus Agkistrodon
Demographic and phylogeographic histories of two venomous North American snakes of the genus Agkistrodon
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DOI：
10.1016/j.ympev.2008.04.008
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发表时间：
2008-08-01
影响因子：
4.1
通讯作者：
Burbrink, Frank T.
中科院分区：
文献类型：
--
作者：
Guiher, Timothy J.;Burbrink, Frank T.
许多研究表明，目前居住在以前冰川地区的谱系被推入南部冰川避难所，并自末次盛冰期以来扩展到现代范围。很少有研究比较冰川循环对谱系多样化和历史人口统计学的影响，在密切相关的物种重叠的范围。在这项研究中，我们比较了北美东部两种密切相关且广泛共存的毒蛇的地理结构，历史人口统计学和近似谱系年龄，这两种毒蛇是棉口蛇（Agkistrodon piscivorus）和铜斑蛇（A. contorbian）使用来自mtDNA基因细胞色素B的序列。我们推断出A. contoracional和A.没有共同的地理或时间模式的谱系多样化确定这些物种。上新世晚期，A. Piscivorus（约2.5 mya），早更新世A.（相当于1.5百万年）。人口统计数据显示，在末次冰期最大值（类似于20,000年前）之后，A. contoraeus（中央支和东部支）和A.食鱼（大陆分支）。A.的佛罗里达分支。食鱼的是唯一的血统，其恒定的人口规模，通过时间推断，可能是由于稳定的人口持续存在的地区不受冰川的进步。我们的数据表明，独特的栖息地偏好可能塑造了每个物种的地理和人口历史。(c)2008年爱思唯尔公司All rights reserved.
Many studies have revealed that lineages currently inhabiting formerly glaciated areas were pushed into southern glacial refugia and have expanded into their modern range since the last glacial maximum. There have been few studies that compare the effects of glacial cycles on lineage diversification and historical demography in closely related species with overlapping ranges. In this study we compare phylogeographic structure, historical demography, and approximate lineage age in two closely related and broadly co-occurring venomous snakes in eastern North America, the cottonmouth (Agkistrodon piscivorus) and copperhead (A. contortrix) using sequences from the mtDNA gene cytochrome b. We inferred three geographic lineages of A. contortrix and two of A. piscivorus with no common geographic or temporal pattern of lineage diversification identified for these species. Lineage diversification occurred in the Late Pliocene for A. piscivorus (similar to 2.5 mya) and in the Early Pleistocene for A. contortrix (similar to 1.5 mya). Demographic estimates revealed population expansion following the last glacial maximum (similar to 20,000 years ago) in two lineages of A. contortrix (the Central clade and Eastern clade) and one lineage of A. piscivorus (the Continental clade). The Florida clade of A. piscivorus is the only lineage for which constant population size through time was inferred, possibly due to stable populations persisting in areas unaffected by glacial advances. Our data suggest that unique habitat preferences may have shaped both the phylogeographic and demographic histories of each species. (c) 2008 Elsevier Inc. All rights reserved.