Latvis, Maribeth , Souza, Vinicius C. , Soltis, Pamela , Soltis, Douglas .
Phylogenetic Relationships and Divergence Time Analysis in Agalinis (Orobanchaceae).
Agalinis (Orobanchaceae) is a hemiparasitic genus of approximately 60 species, with a geographical distribution extending from Nova Scotia, Canada, to Argentina and Chile. Intrageneric relationships between the two continents are unknown, and the South American species appear to have a fascinating history of character evolution, including woody growth forms and changes in floral form involving new pollinator syndromes. While the North American species have been the focus of recent study, the South and Central American species of Agalinis are poorly understood and have not been included in phylogenetic studies until now. Approximately half of the South American species occur in southeastern Brazil, with several species endemic to the region, in addition to Esterhazya, a closely allied genus whose distinction from Agalinis has been questioned. Most of the remaining taxa occur in the Andean puna communities of Peru and Bolivia above 3000 meters. Thus, the two South American population centers of Agalinis are disjunct from one another. These disjunctions within South America, and between North and South America, provide intriguing questions regarding migration and diversification. By combining data sets from the North American taxa with data for newly collected taxa from Brazil, the Andes, and Central America, we have produced a molecular phylogeny of Agalinis and four outgroup genera (Brachystigma, Dasistoma, Aureolaria and Esterhazya) using seven chloroplast and four nuclear loci. Dates for nodes within the tree were obtained by expanding sampling into the Lamiales and calibrating the phylogeny using lamiid fossils (e.g. Fraxinus, Bignoniaceae) using Penalized Likelihood in r8s. These results will be discussed, along with implications for future studies of biogeography and character evolution within this clade.
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1 - Florida Museum Of Natural History, Florida Museum Of Natural History, Dickinson Hall, Museum Rd., Gainesville, FL, 32611, USA
2 - Universidade de São Paulo, Escola Superior de Agricultura Luiz de Quei, Departamento de Ciências Biológicas, Avenida Pádua Dias, 11 - Caixa Postal 9 Agronomia, Piracicaba, SP, 13418-900, Brazil
3 - University Of Florida, Florida Museum Of Natural History, PO BOX 117800, Gainesville, FL, 32611-7800, USA
4 - University of Florida, Department of Biology, Gainesville, FL, 32611, USA
divergence time estimation.
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell B/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 4:00 PM