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

dc.contributor.authorKroll, Oliver
dc.contributor.authorHershler, Robert
dc.contributor.authorAlbrecht, Christian
dc.contributor.authorTerrazas, Edmundo M.
dc.contributor.authorApaza, Roberto
dc.contributor.authorFuentealba, Carmen
dc.contributor.authorWolff, Christian
dc.contributor.authorWilke, Thomas
dc.date.accessioned2022-11-18T09:56:39Z
dc.date.available2012-06-27T10:34:12Z
dc.date.available2022-11-18T09:56:39Z
dc.date.issued2012
dc.description.abstractLake 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.en
dc.identifier.urihttp://nbn-resolving.de/urn:nbn:de:hebis:26-opus-88571
dc.identifier.urihttps://jlupub.ub.uni-giessen.de//handle/jlupub/9647
dc.identifier.urihttp://dx.doi.org/10.22029/jlupub-9035
dc.language.isoende_DE
dc.rightsNamensnennung - Nicht-kommerziell - Keine Bearbeitung 3.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subjectLake Titicacaen
dc.subjectendemic species assemblageen
dc.subjectmicrogastropod genus Heleobiaen
dc.subjectevolutionary historyen
dc.subjectgeographic distributionsen
dc.subject.ddcddc:570de_DE
dc.titleThe endemic gastropod fauna of Lake Titicaca : correlation between molecular evolution and hydrographic historyen
dc.typearticlede_DE
local.affiliationFB 08 - Biologie und Chemiede_DE
local.opus.fachgebietBiologiede_DE
local.opus.id8857
local.opus.instituteDepartment of Animal Ecology and Systematics , microgastropod genus Heleobiade_DE
local.source.freetextEcology and Evolution, 2(7), 1517-1530de_DE
local.source.urihttps://doi.org/10.1002/ece3.280

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