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Abstract Detail


Frost, Laura [1], Olmstead, Richard [2].

Citharexyleae (Verbenaceae): a case of phylogenetic niche shift.

Studies of biogeography in the context of evolutionary relationships have led to hypotheses regarding how species move and diversify through time. This study aims to test two such hypotheses: 1. Phylogenetic niche conservatism, species more often move than adapt, and 2. Diversification rates increase following biome shift. The Neotropical plant tribe Citharexyleae (Verbenaceae) is composed of 134 species of trees and shrubs in three genera: Citharexylum, Bailonia, and Rehdera. In the largest genus, Citharexylum, species are distributed across Central America and South America in low-elevation, mesic forests or in high-elevation, cloud forests. A biome shift from low to elevations has been inferred from preliminary data for Citharexyleae. In other plant lineages, biome shift has been associated with increased diversification rate. Allopatric speciation, lowered competition for niche space, or a combination of both are likely drivers of the relatively rapid diversification in Andean alpine lineages. The objectives of this study are to 1. infer a phylogeny of Citharexyleae and 2. determine diversification rates after long-distance dispersal events (migration between North and South America) versus biome shift (low to high elevation). The phylogenetic tree of Citharexyleae will be constructed using multiple loci in the chloroplast (trnT-L, trnQ-rps16, rpl32-trnL) and nuclear genomes (ITS, ETS, and multiple pentatricopeptide repeat (PPR) genes) and analyzed using Maximum likelihood and Bayesian methods of statistical inference. Diversification rates will be estimated using the methods of Alfaro et al. and analyzed using turboMEDUSA software.

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1 - University of Washington, Department of Biology, Box 351800, Seattle, WA, 98195, USA
2 - University of Washington, Department of Biology, CAMPUS BOX 355325, SEATTLE, WA, 98195-5325, USA

phylogenetic niche conservatism
diversification rate

Presentation Type: Poster:Posters for Topics
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PBG010
Abstract ID:661
Candidate for Awards:None

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