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Title: Evolutionary ecology of neotropical orchids, with emphasis on Oncidiinae
Author: Powell, Martyn P.
ISNI:       0000 0001 3497 9104
Awarding Body: The University of Reading
Current Institution: University of Reading
Date of Award: 2007
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This thesis investigates speciation in Neotropical orchids, with a focus on the subtribe Oncidiinae, which has undergone a dramatic radiation in the Neotropics. A near-complete species-level phylogeny of the Tolumnia clade (a subset of the Oncidiinae), comprising 47 of the 51 currently recognised species, based on multiple plastid (trnH-psbA, trnL-F, rps16) and nuclear DNA regions (ITS and ETS) provides a well resolved and robust framework from which to address questions about the evolutionary history of this group. It also permits the clarification of the taxonomic status of certain anomalous taxa, including the genus Amparoa which is found to be embedded within Rhynchostele. Significant levels of rate heterogeneity are observed between the lineages of this phylogenetic tree, and potential causes, both physiological and ecological, of these are examined, although no single causal factor is identified.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available