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Abstract Detail



Bryological and Lichenological Section/ABLS

Lewis, Lily R. [1], Rozzi, Ricardo [2], Goffinet, Bernard [1].

A RADseq approach for resolving the amphitropical phylogeographic history of  the dung moss Tetraplodon (Bryopsida: Splachnaceae).

Amphitropical disjunctions exist across a diversity of organisms, but are particularly common among cryptogams. The dung moss Tetraplodon is widespread in northern Laurasia with disjunctions into high elevation tropical regions and southernmost South America. Previous phylogenetic work identified an amphitropical crown group for Tetraplodon. Variation in discrete genetic loci, however, was insufficient to resolve phylogenetic and hence geographic structure within the amphitropical lineage, with patterns in the data suggesting that an expanded locus sampling was necessary. Using a restriction site associated DNA sequencing (RADseq) approach we have sequenced and genotyped thousands of homologous loci for samples across the geographic range of the amphitropical lineage. Analysis of RAD loci using maximum likelihood, species tree estimation, and individual assignment provides strong support for the monophyly of the subAntarctic neo-endemic T. fuegianus and suggests its shared ancestry with populations from northwestern North America, and resolves geographic structure broadly within the lineage.


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1 - University of Connecticut, Department of Ecology and Evolutionary Biology, Storrs, CT, 06269, USA
2 - Universidad de Magallanes, Omora Ethnobotanical Park, Institute of Ecology and Biodiversity, Puerto Williams, Antarctic Province, Chile

Keywords:
none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 70
Location: Salon 10/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 3:45 PM
Number: 70009
Abstract ID:1849
Candidate for Awards:None


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