• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Ecology and Evolution >The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history
【2h】

The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history

机译：的喀喀湖特有的腹足动物区系：分子进化与水文学史的相关性

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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.
机译：的喀喀湖位于高原高原，是南美唯一的古老湖泊。这个2至3 My年龄（其中My为百万年）的水体具有复杂的历史，包括在更新世期间至少有五个主要的水文阶段。通常认为这些物理事件有助于塑造湖泊生物区系的演化历史。在这里，我们研究的喀喀湖中的一种特有物种群落，由微型腹足动物属Heleobia的成员组成，以确定该湖是否已作为遗存物种的储藏库或局部多样化的场所，以评估该地区古水文学和该地区的水文地质学的一致性。这种组合的进化史，并评估地方血统的地理分布是否是等级化的。我们的系统发育分析表明，喀喀湖/高原动物Heleobia动物群（加上极少数的类群）形成了一个物种群。分子时钟分析表明，高原生物群的最新共同祖先（MRCA）进化了我的0.53（0.28–0.80），而高原生物群及其极限姐妹群的MRCA进化了我的0.92（0.46-1.52）。喀喀湖的特有物种比湖泊本身年轻，这主要意味着湖内物种形成。此外，演化分支事件的时机和喀喀湖的两个前兆即卡巴纳湖和巴利维安湖的年龄是一致的。尽管的的喀喀湖似乎是该地区Heleobia动物区系的主要物种，但地方特有的当代空间格局已被当地河流分类单元的移民和/或移民事件所掩盖，我们将其归因于高原的不稳定水文历史。因此，地方病的等级分布并不明显，但是两个区域进化枝之间只有一个遗传断裂。我们还讨论了与其他区域生物群研究相关的发现，并建议盐度耐受性是高原动物群进化中最可能的限制因素。

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号