INVESTIGADORES
PREMOLI IL'GRANDE andrea Cecilia
artículos
Título:
How did a grass reach Antarctica? The Patagonian connection of Deschampsia antarctica (Poaceae)
Autor/es:
FASANELLA, MARIANA; PREMOLI, ANDREA C; URDAMPILLETA, JUAN D; GONZÁLEZ, MARÍA LAURA; CHIAPELLA, JORGE O
Revista:
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2017 vol. 185 p. 511 - 524
ISSN:
0024-4074
Resumen:
Deschampsia antarctica is the only grass naturally occurring in Antarctica, and it is also indigenous to southernSouth America. We aimed to evaluate patterns of within-population genetic diversity and between the focal areasPatagonia and Antarctica by using 144 sequences of nuclear internal transcribed spacer and non-coding plastidregions. We analysed phylogenetic relationships between these two main areas and performed demographic andlandscape analysis. To test the divergence time between Antarctic and Patagonian populations we used approximateBayesian computation. We found 17 nuclear and eight plastid haplotypes. For both molecular markers, Patagoniawas the most genetically variable area in the range of D. antarctica. The divergence time between populations fromAntarctica and Patagonia was dated to the mid to late Pleistocene. The large number of private haplotypes foundin Patagonia and the great genetic variability support the hypothesis of a South American origin of the Antarcticpopulations of D. antarctica. Finally, we suggest that D. antarctica probably survived the Last Glacial Maximum andpossibly earlier glaciations in ice-free refugia in Patagonia and Antarctica. Dispersal to Antarctica possibly occurredin the mid to late Pleistocene through bird-aided long-distance transport from South America.