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Abstract Detail



Systematics Section/ASPT

Noonan , Katherine M [1], Ayers, Tina [2].

Molecular phylogeny and biogeography of Porophyllum (Tageteae).

Porophyllum is a genus of rayless composites in the Tageteae subfamily (Asteraceae). The genus has an amphitropical distribution, with a range extending from the United Sates and Mexico to the arid regions of Bolivia, Paraguay, and Brazil. Porophyllum has not been reported in tropical Central and South America, except for one widespread species, P. ruderale. Amphitropical distributions have intrigued biologists for over a century, and most phylogenetic studies support a North American origin. Our data support the hypothesis of movement from North to South America, with multiple dispersal events. The biogeography of Porophyllum is also examined on a smaller scale. Desert ecosystems are often overlooked in conservation efforts, due to generally low biodiversity relative to mesic biomes. However, arid lands are home to a higher percentage of narrowly endemic species. The genus Porophyllum has several named species with extremely restricted ranges. We examined the relationships of these narrow endemic taxa to their widespread relatives. Are these species basal in the genus, or more derived? Is the widespread species, P. ruderale, basal? Using chloroplast (ndhF gene, and spacer regions trnL-rpl32, trnY-rpoB, trnV-ndhC) and nuclear (ITS) data, we have constructed a molecular phylogeny of Porophyllum, to answer these biogeographical questions.


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1 - Northern Arizona University, Biology, 617 S. Beaver st, Flagstaff, AZ, 86001, USA
2 - Northern Arizona University, Department Of Biological Sciences, PO Box 5640, Flagstaff, AZ, 86011-5640, USA

Keywords:
amphitropical
Biogeography.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PSY043
Abstract ID:890
Candidate for Awards:None


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