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

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dc.contributor.author Kroll, Oliver en
dc.contributor.author Hershler, Robert en
dc.contributor.author Albrecht, Christian en
dc.contributor.author Terrazas, Edmundo M. en
dc.contributor.author Apaza, Roberto en
dc.contributor.author Fuentealba, Carmen en
dc.contributor.author Wolff, Christian en
dc.contributor.author Wilke, Thomas en
dc.date.accessioned 2013-09-27T12:27:29Z
dc.date.available 2013-09-27T12:27:29Z
dc.date.issued 2012
dc.identifier.citation Kroll, Oliver, Hershler, Robert, Albrecht, Christian, Terrazas, Edmundo M., Apaza, Roberto, Fuentealba, Carmen, Wolff, Christian, and Wilke, Thomas. 2012. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F21456">The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history</a>." <em>Ecology and Evolution</em>. 2 (7):1517&ndash;1530. <a href="https://doi.org/10.1002/ece3.280">https://doi.org/10.1002/ece3.280</a> en
dc.identifier.issn 2045-7758
dc.identifier.uri http://hdl.handle.net/10088/21456
dc.description.abstract 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&#39;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. en
dc.relation.ispartof Ecology and Evolution en
dc.title The endemic gastropod fauna of Lake Titicaca: correlation between molecular evolution and hydrographic history en
dc.type Journal Article en
dc.identifier.srbnumber 111819
dc.identifier.doi 10.1002/ece3.280
rft.jtitle Ecology and Evolution
rft.volume 2
rft.issue 7
rft.spage 1517
rft.epage 1530
dc.description.SIUnit NH-Invertebrate Zoology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 1517
dc.citation.epage 1530


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