Cryptic speciation, genetic diversity and gene flow in the California turret spider Atypoides riversi (Araneae:Antrodiaetidae)
Cryptic speciation, genetic diversity and gene flow in the California turret spider Atypoides riversi (Araneae:Antrodiaetidae)
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DOI：
10.1111/j.1095-8312.2004.00312.x
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发表时间：
2004-05-01
影响因子：
1.9
通讯作者：
Chi, B
中科院分区：
文献类型：
--
作者：
Ramirez, MG;Chi, B
基于10个等位酶位点的变异，比较了加利福尼亚中部8个地点的转塔蜘蛛（Atypoides river）种群。种群间遗传距离的多维尺度定义了四个种群单位（Coast Range, Sierran, Valley, Jenness Camp），证实了先前研究表明的Coast Range和Sierran种群的差异性。虽然这些单位的物种地位尚未确定，但鉴于其明显的遗传独特性（两个固定的等位基因差异），Jenness Camp最有可能代表一个新物种。所有单位的种群总体上都处于Hardy-Weinberg平衡状态，没有近交的证据，尽管变异很小（平均H-o = 2.8%，平均P = 15.4%）。这些种群的变异性降低可能是重复瓶颈、环境同质性和/或方向选择的结果。在没有森林生境干预的情况下，单位内的种群间分化显著，而在有森林生境干预的情况下则显著减少，这表明只有在存在森林廊道的情况下才可能发生基因流动。为促进保存现有的基因库和提高参与基因库的程度，At单位的管理。riveri应该专注于保持尽可能多的种群在原地，促进它们之间的联系，同时也为潜在的殖民创造或恢复栖息地。(C) 2004伦敦林奈学会。
Populations of the turret spider Atypoides riversi from eight central Californian sites were compared based on variation at ten allozyme loci. Multidimensional scaling of interpopulation genetic distances defined four population units (Coast Range, Sierran, Valley, Jenness Camp), corroborating the distinctness of Coast Range and Sierran populations indicated by a prior study. While the species status of these units has yet to be determined, Jenness Camp is the most likely to represent a new species, given its clear genetic uniqueness (two fixed allelic differences). Populations in all units were generally in Hardy-Weinberg equilibrium with no evidence of inbreeding, though variability was minimal (mean H-o = 2.8%, mean P = 15.4%). Reduced variability in these populations may be the result of repeated bottlenecks, environmental homogeneity, and/or directional selection. Interpopulation differentiation within units was significant in the absence of intervening forest habitat and was substantially less in its presence, indicating that gene flow is likely only when forest corridors exist. To foster preservation of the existing gene pool and enhance participation in it, management of the units of At. riversi should focus on maintaining as many populations in situ as possible and facilitating connections between them, while also creating or restoring habitat for potential colonization. (C) 2004 The Linnean Society of London.