Abstract Detail



Systematics

Lichter Marck , Isaac H [1], Freyman, Will [2], Schneider, Adam [3], Tian, Eddie [1], Baldwin, Bruce [4].

Phylogenomics of the rock daisies (Perityleae; Asteraceae).

The members of the rock daisy tribe Perityleae (Asteraceae) are rock dwelling herbs and shrubs distributed throughout the western United States, Mexico, and South America. The tribe consists of five genera: the native Chilean monotypic genus Lycapsus, the genus Amauria, endemic to the Baja California Peninsula, the central Mexican genus Eutetras, the genus Pericome, native to the Southwestern U.S. and northern Mexico, and the genus Perityle, which consists of 66 species native to arid regions and coastal habitats, as well as islands. Perityleae represents a striking example of hypothesized repeated amphitropical dispersals from North America to South America. While the monograph by Powell et al. (1974) has long served as a source for species and generic delimitation in this group, lack of a molecular phylogeny has impeded our ability to test biogeographic and putative taxonomic boundaries. In this poster, We present results from a next generation sequencing project, specifically using genome skimming, to infer the first densely sampled molecular phylogeny of Perityleae. Our dated phylogenetic tree tests classic taxonomic hypotheses in this group as well as timing of diversification corresponding to aridification of desert habitats in the Southwest U.S.  We also apply an ancestral state reconstruction of pappus element morphology to elucidate patterns of phenotypic evolution in the group.


1 - UC Berkeley, Integrative Biology, Berkeley, California, 94720, United States
2 - University of Minnesota, Department of Ecology, Evolution and Behaviour, 1479 Gortner Ave, Suite 140 , St Paul, MN, 55108, USA
3 - University Of Toronto Mississauga, Department Of Biology, 3359 Mississauga Rd, Mississauga, ON, L5L 1C6, Canada
4 - University Of California, Berkeley, University And Jepson Herbaria, 1001 Valley Life Sciences Building, Berkeley, CA, 94720, United States

Keywords:
Perityleae
Asteraceae
Systematics
Evolution
Deserts.

Presentation Type: Poster
Number: PSY013
Abstract ID:485
Candidate for Awards:None


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