MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Pleistocene climatic cycling and diversification of the Andean treefrog, Hypsiboas andinus
Autor/es:
KOSCINSKI, D.; HANDFORD, P.; TUBARO, P. L.; SHARP, N. M. M.; LOUGHEED, S. C.
Revista:
MOLECULAR ECOLOGY
Editorial:
Wiley
Referencias:
Año: 2008 vol. 17 p. 2012 - 2025
Resumen:
Abstract
Our understanding of the causes of diversification of Neotropical organisms lags behind
that of Northern Hemisphere biota, especially for montane and temperate regions of southern
South America. We investigated the mitochondrial DNA genealogical patterns in 262
individuals of the frog Hypsiboas andinus from 26 sites across the eastern ranges of the
Andes Mountains in Argentina and Bolivia. Our phylogenetic analyses indicate at least
three distinct lineages: one representing H. andinus from Northwestern Argentina and
southern Bolivia, at least one H. andinus lineage from northern Bolivia, and one clade
containing both H. andinus (from the southern portion of the species range) and its putative
sister taxon Hypsiboas riojanus. Hypsiboas andinus samples from northern Bolivia are well
differentiated and may represent distinct species. The northern Argentine H. andinus lineage
and southern H. andinus /H. riojanus lineage likely diverged between 2 and 6 million years
ago; their current sympatry may be the result of secondary contact due to range expansion
after isolation during Andean uplift or may reflect cryptic species. Within the geographically
extensive northern H. andinus clade, we found significant geographical structuring consistent
with historical fragmentation and subsequent range expansion. The timing of this
fragmentation and range expansion coincide with the Pleistocene, a time of extensive
climatic cycling and vegetational shifts. Average divergence among clades is lower than
those found for other Neotropical taxa, highlighting the potential importance of recent
climatic history in diversification in the southern Andes.
Keywords: Andes, Argentina, Hypsiboas, phylogeography, refugia