INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Climate Control on Ancestral Population Dynamics: Insight from Patagonian Fish Phylogeography
Autor/es:
DE. RUZZANTE; SJ. WALDE; JC. GOSSE; VE CUSSAC; E HABIT; TS. ZEMLAK; EDM. ADAMS
Revista:
MOLECULAR ECOLOGY
Editorial:
Blackwell
Referencias:
Año: 2008 vol. 17 p. 2234 - 2244
ISSN:
0962-1083
Resumen:
Changes in lake and stream habitats during the growth and retreat of Pleistocene glaciers
repeatedly altered the spatial distributions and population sizes of the aquatic fauna of the
southern Andes. Here, we use variation in mtDNA control region sequences to infer the
temporal dynamics of two species of southern Andean fish during the past few million
years. At least five important climate events were associated with major demographic
changes: (i) the widespread glaciations of the mid-Pliocene (c. 3.5 Ma); (ii) the largest
Patagonian glaciation (1.1 Ma); (iii) the coldest Pleistocene glaciation as indicated by
stacked marine ä18O (c. 0.7Ma); (iv) the last southern Patagonian glaciation to reach the
Atlantic coast (180 ka); and (v) the last glacial maximum (LGM, 2325 000 years ago). The
colder-water inhabitant, Galaxias platei, underwent a strong bottleneck during the LGM
and its haplotype diversity coalesces c. 0.7 Ma. In contrast, the more warm-adapted and widely
distributed Percichthys trucha showed continuous growth through the last two glacial
cycles but went through an important bottleneck c. 180 000 years ago, at which time
populations east of the Andes may have been eliminated. Haplotype diversity of the most
divergent P. trucha populations, found west of the Andes, coalesces c. 3.2Ma. The demographic
timelines obtained for the two species thus illustrate the continent-wide response
of aquatic life in Patagonia to climate change during the Pleistocene, but also show how
differing ecological traits and distributions led to distinctive responses.