Weeks, Andrea , Pell, Susan K. , Fine, Paul V. A. , Moore, Brian R. , Daly, Douglas C. .
Historical biogeography of the pantropical cashew and frankincense families (Anacardiaceae, Burseraceae; Sapindales).
The sister angiosperm lineages Anacardiaceae and Burseraceae are a valuable comparative model for investigating the interplay of key innovations and historical biogeography during cladogenesis. The families comprise ca. 1500 species worldwide; however, the latitudinal range as well as the morphological and ecological diversity of Anacardiaceae considerably eclipses that of Burseraceae. These differences raise the question of how lineages having identical age and equivalent numbers of species could have undergone such contrasting evolutionary trajectories while becoming so widespread. Here we present an analysis of historical biogeography and evolutionary rates that tests two main hypotheses: 1) that the two families diverged and radiated in Western Laurasia during the Paleoeocene or earlier and 2) that frost-tolerant Anacardiaceae genera with disjunct distributions across Northern Hemisphere continents represent geologically recent radiations. Phylogenetic reconstruction of the families incorporated Bayesian analysis of nuclear and chloroplast DNA sequence data from 250 spp. representing 77 of 101 genera. Nine fossil-based ages were used to estimate divergence times within the phylogeny using the calibration programs, r8s and BEAST. These results were then considered with those from Bayes-DIVA, which incorporates dispersal-vicariance reconstructions with measures of phylogenetic uncertainty, in order to assess the location and timing of cladogenic events associated with the hypotheses under investigation.
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1 - George Mason University, Fairfax, VA, USA
2 - Brooklyn Botanic Garden, Brooklyn, NY, USA
3 - University of California, Berkeley, CA, USA
4 - New York Botanical Garden, Bronx, NY, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood D/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 8:15 AM