Bryological and Lichenological Section/ABLS
McCune, Bruce , Root, Heather, T , Schoch, Conrad L. , Kageyama, Stacie , Miadlikowska, Jolanta .
Geographic, climatic, and chemical differentiation in the Hypogymnia imshaugii species complex in North America.
Hypogymnia imshaugii is one of the most common, conspicuous, and morphologically variable epiphytes of the Pacific coastal states and provinces. The species varies greatly in morphology and chemistry, suggesting multiple closely related species or phenotypic plasticity, or both. We sought to determine whether ecologically distinct but unrecognized species might be present within H. imshaugii. Clarifying the species complex could potentially improve ecological inferences based on community sampling. Three relatively well-defined genetic groups plus an miscellaneous other individuals were detected in Hypogymnia imshaugii based on a haplotype network of ITS sequences. Reconstructed phylogenies (ML and MrBayes) were inconclusive because many phylogenetic relationships within the H. imshaugii were not resolved and most internodes lack significant support. The four major chemotypes in H. imshaugii differed in frequency among the genetic groups. None of the genetic groups was, however, uniform in chemotype. Only one chemotype occurred in a single genetic group. The chemotypes had overlapping but partially distinct geographic distributions. Each chemotype showed its own relationship to climate as shown by NPMR regression of occurrences of chemotypes against climatic variables. The genetic variation and phylogenetic relationships within H. imshaugii, as detected in our data primarily in the ITS and GPD1 genes, do not correspond to the geographic variation in morphology, chemistry, and climate. Our results suggest that more and faster evolving loci are necessary to support or refute additional species within the H. imshaugii complex.
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1 - Oregon State University, Department of Botany & Plant Pathology, 2082 Cordley Hall, Corvallis, Oregon, 97331-2902, USA
2 - National Center for Biological Information (GenBank), National Library of Medicine, National Institutes of Heath, 45 Center Drive, MSC 6510, Bethesda, Maryland, 20892, USA
3 - USDA-ARS Fort Keogh LARRL
4 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
nrDNA ITS sequences
nonparametric multiplicative regression
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Superior B/Cliff Lodge - Level C
Date: Tuesday, July 28th, 2009
Time: 9:45 AM