The phylogeny and phylogeography of two false-truffles, Leucophleps spinispora and Hymenogaster sublilacinus, in the Great Basin, United States.
Albee-Scott, Steven Robert
2005
Abstract
The Great Basin, USA, stretches from the Sierra Nevadas of California to the mountains of Utah, and from the plains of Idaho to Mexico. The fluctuating environmental history of the Great Basin makes it a superb laboratory for testing phylogeographic hypotheses. The multiple cycles of glaciation led to dramatic changes in the environment affecting the organisms present. I used population genetics and Bayesian phylogenetic inference to evaluate the phylogeny and intraspecific population history of two false truffles, <italic> Leucophleps spinispora</italic> and <italic>Hymenogaster sublilacinus</italic>. <italic>Leucophleps spinispora</italic> is found throughout the western United States in the subalpine forests and <italic>Hymenogaster sublilacinus </italic> is found throughout the world in the lower montane forests. Both species of fungi are common to the Great Basin and have been collected in all mountains with both subalpine and lower montane forests. These two false truffles form a symbiotic association with the coniferous trees found in the Great Basin. The morphology of <italic>Leucophleps spinispora</italic> was used to develop a phylogeny. The morphological evidence suggested that the <italic> Leucogastrales</italic> were sister to the <italic>Albatrellaceae</italic>. The phylogeny inferred from the internal transcribed spacer 1, 5.8S, and internal transcribed spacer 2 sequences supported the morphological phylogenetic hypothesis. In the molecular phylogeny, <italic>Leucophleps spinispora</italic> was placed sister to <italic>Polyporoletus sublividus</italic>. The phylogenetic relationships of <italic>Hymenogaster sublilacinus</italic> have been resolved to the generic level within <italic>Cortinarius</italic>. The specific relationships of <italic>Hymenogaster sublilacinus</italic> remained ambiguous, because the full range of character variability within the genus. The fine scale relationships of <italic>Hymenogaster sublilacinus</italic> were inferred using morphological and molecular data. The extent of morphological and molecular character variation was estimated using data from multiple populations of <italic>Hymenogaster sublilacinus</italic> and synonyms. The phylogeography of <italic>Leucophleps spinispora</italic> and <italic> Hymenogaster sublilacinus</italic>, was inferred using the internal transcribed spacer 1, 5.8S, internal transcribed spacer 2, the intergenic spacer 1, and the intergenic spacer 2 from the nuclear ribosomal repeat. The phylogeography of these two fungi shows two routes of migration into the Great Basin within the last one million years for both fungi. This result suggests that the lifezones may become mixed during times of glaciation.Subjects
False-truffles Great Basin Hymenogaster Sublilacinus Leucophleps Spinispora Mycology Phylogeny Phylogeography States Two United
Types
Thesis
Metadata
Show full item recordCollections
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.