Phylogeography of surface and cave Astyanax (Teleostei) from Central and North America based on cytochrome b sequence data

Molecular Phylogenetics and Evolution
U StreckerH Wilkens

Abstract

Astyanax fasciatus has become a model organism for the study of regressive and adaptive evolution in cave animals. To fully understand these processes, it is important to have background information on the systematics and phylogeography of surface and cave populations of this species. Here we investigate the phylogeography of A. fasciatus in North and Central America and also the historical biogeography of this region. Phylogenetic analysis of part of the mtDNA cytochrome b gene from 26 surface and nine cave A. fasciatus populations revealed seven major clades, which, in principle, represent geographical patterns of distribution. However, the four strongly eye and pigment reduced cave populations, Piedras, Sabinos, Tinaja, and Curva, form a separate cluster, which is not sister group to the surface populations from the same locality. Similarly the Belizean populations do not cluster with their geographic neighbors from the Yucatan. The analyses indicate that there have been recurrent invasions of surface Astyanax from the south, that were most likely influenced by major climate changes during the Pleistocene. During this period, ancestors of the strongly eye and pigment reduced cave populations were able to survive underground ...Continue Reading

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