Microgeographic differentiation among closely related species of Biomphalaria Gastropoda: Planorbidae from the Andean AltiplanoReport as inadecuate




Microgeographic differentiation among closely related species of Biomphalaria Gastropoda: Planorbidae from the Andean Altiplano - Download this document for free, or read online. Document in PDF available to download.

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Direct development and water dependence entail limited vagility in freshwater fauna. In these organisms, thepopulation structure is probably linked to restrictions imposed by the habitat. In this study we investigate therelative contribution of processes stimulating the divergence of populations of Biomphalaria costata Biese, 1951and Biomphalaria crequii Courty, 1907, two freshwater snails occurring in two contiguous and fragmented closedbasins from the Andean Altiplano using mitochondrial DNA cytochrome c oxidase subunit I sequences, shellmorphometric and radular morphology. In order to clarify the species boundaries, a third allopatric species wasincluded: Biomphalaria aymara Valdovinos and Stuardo, 1991. Molecular analyses recovered two distinct clades: onecomposed of B. aymara from the Isluga swamps and B. costata from Spring 1 in Salar de Carcote, the single springoccupied by this species, and another integrated by snails from 12 springs spread across the Salar de Carcoteand the Salar de Ascotán assigned to B. crequii, originally described from the Salar de Ascotán. Unlike shellmorphometrics, radular morphology was informative for distinguishing these species. The division of the lineagesoccurred in the Late Pleistocene. A subclade that includes snails from the southernmost springs in Salar de Ascotánsuggests fragmentation of the distribution of B. crequii associated with landscape discontinuities. In addition tomicrovicariance signals, the private haplotypes scattered around both salt spans show that close-range dispersalis a common biogeographic process in this species. As evolutionary units, the single isolated and restrictedpopulation of B. costata has a high priority for conservation.Nota general

Artículo de publicación ISI



Author: Collado Insulza, Gonzalo; -

Source: http://repositorio.uchile.cl/



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