El Instituto de Ecología, A.C., se complace en invitar al
Miércoles 19 de Agosto, 2015, 1 pm. Auditorio UNIRA, INECOL
Dr. Kevin Nixon,
School of Integrative Plant Science Cornell University.
OAK (Quercus) Phylogeny and biodiversity in relation to climate.
The genus Quercus (Oak, Encino, Roble) is one of the most important woody angiosperm clades in a wide variety of temperate, subtropical and montane and submontane tropical environments of the Northern Hemisphere. Depending on the taxonomic circumscription, oaks include from 300-800 species worldwide. In the Americas there are ca. 225 species, from southern Canada to Colombia, with ca. 165-170 species (75%) in Mexico. Although traditionally considered a temperate group by eurocentric botanists, the cold-temperate deciduous oaks represent the extreme climatic adaptation of a largely evergreen/subevergreen montane tropical and subtropical clade. Fossils for the family Fagaceae occur in the late Cretaceous of North America (ca. 90 myb) but recognizable Quercus does not appear until the early Tertiary (ca. 50 myb), in tropical/subtropical paleo-environments in both Europe and North America. Unfortunately, detailed molecular species cladograms have been difficult in Quercus, at least in part because of high levels of hybridization and introgression. Some major clades of Quercus can be identified as monophyletic, but species relationships are unstable across different gene phylogenies and often in conflict with both morphology and biogeography. However, it is possible to characterize some well-supported clades, as well as potential clades and morpho-species complexes that can provide a basis for ecological characterization. Here I will present the results of a wide-scale preliminary analysis of Quercus niche space in relation to climate and evaluate the predictivity of clade-based, life history-based and morphology-based characterization of species groups, with an emphasis on oaks native to Mexico.
Como parte de su visita, el Dr. Nixon amablemente ha aceptado ofrecer un taller de Winclada el Martes 18. Interesados en participar por favor anotense AQUI para solicitar su reservación, pues el cupo es limitado.