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Abstract Detail


Lampley, Jayne [1], Schilling, Edward [2].

Interpreting the historical biogeography and molecular phylogeny of Trillium within tribe Parideae (Melanthiaceae).

The widespread distribution of the hypothesized Arcto-tertiary Geoflora during the pre-Ice Age Cenozoic Era has long been cited to explain modern-day observations of geographic disjunctions in related plant taxa across the Northern Hemisphere. Trillium, a genus of approximately 60 herbaceous monocot species, exhibits intra- and inter-continental geographic disjunction patterns between eastern and western North America and eastern Asia that are not well understood. In contrast to most clades with this pattern of distribution, the higher species diversity for Trillium is in the eastern US, rather than eastern Asia. The clade within Trillium with the highest species diversity is subgenus Sessilium. Species of this group are disjunct between eastern and western North America, but none occur in Asia. In this study, we analyzed the distribution of subgen. Sessilium within the broader context of the distribution of the entire tribe Parideae. Representatives of each genus of Parideae were sampled, including nearly 50 taxa of Trillium. Multiple markers from the chloroplast genome, which is notably variable within Trillium, were sampled and concatenated and used to infer a phylogenetic tree. Using the BioGeoBears R package, multiple models were tested to determine origins and likely dispersal patterns, particularly within Trillium. The results suggest that there have been multiple movements between major geographic areas. In addition, a qualitative comparison was made between these results and current distribution probabilities for selected Sessilium species using a MaxEnt species distribution modeling (SDM) analysis. This analysis has produced hypotheses about possible origins for Sessilium species which will be presented.

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1 - University of Tennessee, Ecology and Evolutionary Biology, 569 Dabney Hall, Knoxville, TN, 37996-1610, United States
2 - University Of Tennessee, Department Of Ecology & Evolutionary Biology, 569 Dabney Hall, KNOXVILLE, TN, 37996-1610, USA

Arcto-tertiary distribution

Presentation Type: Poster
Session: P, Biogeography Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PBG002
Abstract ID:98
Candidate for Awards:None

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