IBYME   02675
INSTITUTO DE BIOLOGIA Y MEDICINA EXPERIMENTAL
Unidad Ejecutora - UE
artículos
Título:
Population genetic structure and historical population dynamics of the South American sea lion, Otaria flavescens, in north-central Patagonia
Autor/es:
TÚNEZ JI, NARDELLI M, CAPPOZZO HL, CASSINI MH
Revista:
GENETICA
Editorial:
SPRINGER
Referencias:
Año: 2010 vol. 8 p. 831 - 841
ISSN:
0016-6707
Resumen:
The north-central Patagonian coast is the sea
lions most abundant area in Argentina. As occurs along the
entire Atlantic coast, the distribution of breeding colonies
at this smaller geographical scale is also patchy, showing at
least three areas with breeding activity. We study the
genetic structure and historical population dynamics of the
species in five colonies in this area, analysing a 508 basepair
segment of the D-loop control region. Otaria flavescens
showed 10 haplotypes with 12 polymorphic sites. The
genealogical relationship between haplotypes revealed a
shallow pattern of phylogeographic structure. The analysis
of molecular variance showed significant differences
between colonies, however, pairwise comparisons only
indicate significant differences between a pair of colonies
belonging to different breeding areas. The pattern of haplotype
differentiation and the mismatch distribution analysis
suggest a possible bottleneck that would have occurred
64,000 years ago, followed by a demographic expansion of
the three southernmost colonies. Thus, the historical population
dynamics of O. flavescens in north-central Patagonia
appears to be closely related with the dynamics of the
Late Pleistocene glaciations.