Taxon sampling in phylogenetic analysis: An evalution of the basally positioned taxon

Persistent Link:
http://hdl.handle.net/10150/291658
Title:
Taxon sampling in phylogenetic analysis: An evalution of the basally positioned taxon
Author:
McMahon, Michelle Mary, 1965-
Issue Date:
1996
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Taxon sampling is explicitly examined using simulations and probability analyses. The simulations focus on the ability of two different sampling strategies to correctly reconstruct relationships among subgroups of taxa. One sampling strategy chooses taxa randomly, the other strategy chooses taxa to increase the phylogenetic dispersal of the taxa. Also considered is whether the inclusion of a single basal taxon will increase the frequency of correctly reconstructing the relationships among subgroups. Inclusion of the basal taxon is found to decrease success (correct subgroup relationships). The strategies are found to differ, primarily due to differing tendencies to include the basal taxon (the random strategy includes the basal taxon less frequently and outperforms the dispersed strategy). The inclusion of a basal taxon is also found to decrease the probability of correctly reconstructing ancestral character states. The probability of randomly choosing a single taxon from one side of the root is developed.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Biology, General.; Biology, Botany.; Biology, Zoology.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Ecology and Evolutionary Biology
Degree Grantor:
University of Arizona
Advisor:
Maddison, Wayne P.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleTaxon sampling in phylogenetic analysis: An evalution of the basally positioned taxonen_US
dc.creatorMcMahon, Michelle Mary, 1965-en_US
dc.contributor.authorMcMahon, Michelle Mary, 1965-en_US
dc.date.issued1996en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractTaxon sampling is explicitly examined using simulations and probability analyses. The simulations focus on the ability of two different sampling strategies to correctly reconstruct relationships among subgroups of taxa. One sampling strategy chooses taxa randomly, the other strategy chooses taxa to increase the phylogenetic dispersal of the taxa. Also considered is whether the inclusion of a single basal taxon will increase the frequency of correctly reconstructing the relationships among subgroups. Inclusion of the basal taxon is found to decrease success (correct subgroup relationships). The strategies are found to differ, primarily due to differing tendencies to include the basal taxon (the random strategy includes the basal taxon less frequently and outperforms the dispersed strategy). The inclusion of a basal taxon is also found to decrease the probability of correctly reconstructing ancestral character states. The probability of randomly choosing a single taxon from one side of the root is developed.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectBiology, General.en_US
dc.subjectBiology, Botany.en_US
dc.subjectBiology, Zoology.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineEcology and Evolutionary Biologyen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorMaddison, Wayne P.en_US
dc.identifier.proquest1383580en_US
dc.identifier.bibrecord.b34619690en_US
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