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Biogeographic History of New Caledonian Diving Beetles based on Molecular Phylogenies

AutorBalke, Michael; Hendrich, Lars; Pons, Joan ; Vogler, Alfried P.; Ribera, Ignacio
Fecha de publicaciónfeb-2010
CitaciónVI Southern Connection Congress: Gondwana reunited (2010)
ResumenWe focus on a molecular phylogenetic analysis of Exocelina diving beetles. We find a basal position of Australian species in a paraphyletic series, with more recent nested radiations in New Caledonia and New Guinea. Our analyses suggest that dispersal played an important role in the formation of these large insular faunas, although successful colonization appears to be a rare event, and, in this case, is unidirectional. Whether or not a lineage is present on an island is due to chance: Exocelina are absent from Fiji, where related Copelatus have radiated extensively in the same habitats occupied by Exocelina in New Caledonia and New Guinea, while Copelatus are absent from New Caledonia with the exception of a widespread lowland pond species. Lineages of Exocelina apparently colonized New Caledonia twice, and both lineages are derived from an Australian ancestor. The older clade is represented only by two apparently relictual mountain species (one morphologically strongly adapted to highly ephemeral habitats), while the younger clade contains at least 20 species exhibiting great morphological diversity. More generally, we will present a mitochondrial DNA landscape of a near complete species-level sampling of Australasian diving beetles to better understand the biogeography of New Caledonia. We show that in stagnant water species colonization was either recent or occurs repeatedly and recently, as populations from all over Australasia lack stronger geographic signature
DescripciónTrabajo presentado en el VI Southern Connection Congress: Gondwana reunited : a southern perspective for a changing world, celebrado del 15 al 19 de febrero de 2010 en Bariloche (Argentina)
URIhttp://hdl.handle.net/10261/99919
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(IBE) Comunicaciones congresos
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