IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Multiple periclacial refugia and post-glacial colonization of the Andes in the Patagonian herb Calceolaria polyrhiza.
Autor/es:
COSACOV, A.; SÉRSIC, A.; JOHNSON, L.; SOSA, V.; COCUCCI A. A.
Lugar:
Bariloche
Reunión:
Conferencia; Consecuencias del cambio global en las interacciones bióticas de las plantas en ecosistemas de montaña.Symposium : Phylogeography and speciation in Patagonia: a common perspective across taxa?; 2010
Resumen:
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Multiple periglacial refugia and post-glacial colonization of the Andes in the Patagonian
herb Calceolaria polyrhiza
COSACOV A. (1); SERSIC A.N.* (1); SOSA V. (2); JOHNSON L.A. (3) and COCUCCI A.A. (1)
(1) IMBIV - CONICET - UNCordoba (2) Instituto de Ecología - Xalapa - Mexico (3) BYU - Provo - USA
*asersic@com.uncor.edu
For Calceolaria polyrhiza we aimed to determine whether phylogeographic patterns corresponded to in
situ Pleistocene survival or to glacial retreat and postglacial expansion and, to reveal putative glacial
refugia and post-glacial colonization routes.
Haplotypes (27) of the trnH-psbA- intergenic cpDNA spacer were obtained from 68 populations (590
indiv.) covering the entire range of this widely distributed Patagonian endemic herb occurring both in the
temperate forests and arid steppe.
Three phylogeographic breaks revealed four major lineages: two high Andean split first during the late
Miocene, and two Patagonian, ca 4 Ma BP coincident with the steppe establishment. The Patagonian
groups exhibited diversification, rapid population expansion and colonization of the Andes flanks to the
end of the Pleistocene. Populations in formerly ice-covered locations are monomorphic for the four most
abundant haplotypes, suggesting recent independent colonizations by zonal steppe lineages. Highest
diversity spots were found along a N-S transect congruent with the GPG ice-sheet limits.
Past climate fluctuations influenced on diversification, distribution and demography of this plant. A
scenario of multiple periglacial Pleistocene refugia and subsequent multiple recolonization routes, from
east Patagonia to the Andean flanks, is proposed. The phylogeographic structure also preserves imprints
of older phenomena, suggesting multiple and complex processes may moulded biodiversity in Patagnia.