Term of Award
Master of Science in Biology
Document Type and Release Option
Thesis (restricted to Georgia Southern)
Department of Biology
Michael P. Moulton
Committee Member 1
Denson K. McLain
Committee Member 2
John W. Parrish
The patterns of extinction were examined among species of passeriforms introduced to three oceanic islands (Oahu, Tahiti, and Bermuda). Survival was significantly greater for plumage monomorphic than plumage dimorphic species on Oahu and Tahiti. Bermuda did not show this pattern, possibly due to introduced species pool size. Previous studies have documented morphological overdispersion among surviving species and have shown that species introduced earlier are more likely to persist. Yet, neither morphological similarity nor introduction order differed significantly between plumage monomorphic and dimorphic species introduced on Oahu and Tahiti.
Also the abundance data were examined on Oahu in order to determine if monomorphic species had larger population sizes than the population sizes of dimorphic species. The abundance of the monomorphic species was not significantly different than the dimorphic species.
I suggest that plumage dimorphic species have experienced more intense sexual selection pressures, and that response to sexual selection in these species has contrained response to natural selection pressures, thereby, increasing the risk of extinction.
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Redfearn, Todd P., "The Influence of Sexual Selection on the Fate of Species Introductions" (1993). Legacy ETDs. 352.