The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history.
The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history.
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DOI：
10.1002/ece3.280
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发表时间：
2012-07
影响因子：
2.6
通讯作者：
Wilke, Thomas
中科院分区：
文献类型：
--
作者：
Kroll, Oliver;Hershler, Robert;Albrecht, Christian;Terrazas, Edmundo M.;Apaza, Roberto;Fuentealba, Carmen;Wolff, Christian;Wilke, Thomas
的的喀喀湖位于阿尔蒂普拉诺高原，是南美洲唯一的古湖。这个2- 3-My-old（其中My是百万年）的水体有着复杂的历史，包括更新世期间至少五个主要的水文阶段。一般认为，这些物理事件有助于塑造湖泊生物群的进化历史。在这里，我们研究的喀喀湖的特有种组合，由小腹足类属Heleobia的成员组成，以确定该湖是否作为一个水库的遗迹物种或网站的本地多样化，以评估该组合的区域古水文和进化历史的一致性，并评估是否地方性谱系的地理分布是分层的。我们的系统发育分析表明，的的喀喀/高原Heleobia动物群（连同一些extralimital类群）形成一个种群。分子钟分析表明，高原类群的最新共同祖先（MRCAs）的进化时间为0.53（0.28-0.80）My ago，高原类群与其外界姐妹群的MRCAs的进化时间为0.92（0.46-1.52）My ago。的的喀喀湖的特有物种比湖泊本身更年轻，这意味着主要是湖内物种形成。此外，进化分支事件的时间和的的喀喀湖的两个前体，卡巴纳湖和Ballivián的年龄是一致的。虽然的的喀喀湖似乎已经成为区域Heleobia动物群物种形成的主要场所，但当地河流类群的移民和/或移民事件掩盖了当代特有的空间格局，我们将其归因于高原不稳定的水文历史。因此，地方性的等级分布并不明显，而是在两个区域分支之间有一个单一的遗传断裂。我们还讨论了我们的研究结果与其他区域生物群的研究，并建议，耐盐性是最有可能的限制因素在高原物种群的演变。
Lake Titicaca, situated in the Altiplano high plateau, is the only ancient lake in South America. This 2- to 3-My-old (where My is million years) water body has had a complex history that included at least five major hydrological phases during the Pleistocene. It is generally assumed that these physical events helped shape the evolutionary history of the lake's biota. Herein, we study an endemic species assemblage in Lake Titicaca, composed of members of the microgastropod genus Heleobia, to determine whether the lake has functioned as a reservoir of relic species or the site of local diversification, to evaluate congruence of the regional paleohydrology and the evolutionary history of this assemblage, and to assess whether the geographic distributions of endemic lineages are hierarchical. Our phylogenetic analyses indicate that the Titicaca/Altiplano Heleobia fauna (together with few extralimital taxa) forms a species flock. A molecular clock analysis suggests that the most recent common ancestor (MRCAs) of the Altiplano taxa evolved 0.53 (0.28–0.80) My ago and the MRCAs of the Altiplano taxa and their extralimital sister group 0.92 (0.46–1.52) My ago. The endemic species of Lake Titicaca are younger than the lake itself, implying primarily intralacustrine speciation. Moreover, the timing of evolutionary branching events and the ages of two precursors of Lake Titicaca, lakes Cabana and Ballivián, is congruent. Although Lake Titicaca appears to have been the principal site of speciation for the regional Heleobia fauna, the contemporary spatial patterns of endemism have been masked by immigration and/or emigration events of local riverine taxa, which we attribute to the unstable hydrographic history of the Altiplano. Thus, a hierarchical distribution of endemism is not evident, but instead there is a single genetic break between two regional clades. We also discuss our findings in relation to studies of other regional biota and suggest that salinity tolerance was the most likely limiting factor in the evolution of Altiplano species flocks.
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影响因子：
4.9
作者：
Clement, M;Posada, D;Crandall, KA
通讯作者：
Crandall, KA
DOI：
10.1016/s0031-0182(01)00301-7
发表时间：
2001-08-15
影响因子：
3
作者：
Fornari, M;Risacher, F;Féraud, G
通讯作者：
Féraud, G
影响因子：
6.5
作者：
Brooks, J. L.
通讯作者：
Brooks, J. L.
影响因子：
2.4
作者：
Cross, SL;Baker, PA;Dunbar, RB
通讯作者：
Dunbar, RB
影响因子：
2.2
作者：
Argollo, J;Mourguiart, P
通讯作者：
Mourguiart, P