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Abstract Detail


Bryological and Lichenological Section/ABLS

Leavitt, Steven D. [1], St. Clair, Larry L. [1].

Assessing Species Diversity and Evolution in Morphologically and Chemically Diverse Communities of the Lichen-forming Genus Xanthoparmelia (Parmeliaceae, Ascomycota) in Western United States.

The foliose lichen genus Xanthoparmelia includes over 800 described species displaying a complex array of morphological and secondary metabolite diversity. In this study we evaluate the relationship of seven morphologically and chemically diverse Xanthoparmelia species identified in a single well-supported, unresolved monophyletic clade using sequence data from 5 nuclear markers. Taxa include: X. chlorochroa, X. coloradöensis, X. cumberlandia, X. dierythra, X. lipochlorochroa, X. neochlorochroa, and X. vagans. In all analyses we found significant evidence of gene flow or hybridization among investigated taxa. Putative species were not recovered by two empirical species delimitation methods. Additionally, haplotype networks show that taxonomically important secondary metabolites do not reflect genealogical relationships among sampled individuals. These networks suggest multiple independent origins of the vagrant life form at a local scale, and the widespread distribution of some vagrant haplotypes support the grazing ungulate-mediated dispersal of X. chlorochroa. A Bayesian population structure assessment method indicates that these seven taxa can be clustered into three distinct populations, all containing representatives of X. chlorochroa, X. coloradöensis, and X. cumberlandia. Although putative species are not supported by these data, pairwise comparisons of described species groups (FST, exact tests of population differentiation) revealed significant maintenance of population structure between X. chlorochroa, X. coloradöensis, and X. cumberlandia. This study provides detailed insight into α-level diversity and population structure among morphologically and chemically diverse species in Xanthoparmelia and suggests that in some cases species diversity has been overemphasized.


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1 - Brigham Young University, Biology and M. L. Bean Life Science Museum, 401 Widb, Provo, Utah, 84602, USA

Keywords:
none specified

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 19
Location: Magpie B/Cliff Lodge - Level B
Date: Monday, July 27th, 2009
Time: 11:30 AM
Number: 19002
Abstract ID:305


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