Geographic variation in song, morphology, and mitochondrial DNA in Pardalotus striatus in eastern Australia.
Item
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Title
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Geographic variation in song, morphology, and mitochondrial DNA in Pardalotus striatus in eastern Australia.
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Identifier
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AAI9315475
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identifier
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9315475
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Creator
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Katz, Mary.
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Contributor
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Advisers: Robert F. Rockwell | Lester L. Short
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Date
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1993
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Language
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English
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Publisher
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City University of New York.
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Subject
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Biology, Zoology | Biology, Biostatistics
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Abstract
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Variation was investigated in this passerine species in a region where the ranges of three races (melanocephalus, substriatus, and ornatus) overlap. Birds were sampled at sites following a transect along the Great Dividing Range, between 17 and 32.5 degrees south latitude. Recordings were made of males singing near nest sites, and individuals were collected for analyses of plumage and mensural characters and mitochondrial DNA haplotype patterns.;Results of univariate analyses revealed general north-to-south clinal patterns for four song and four morphometric variables. Multivariate cluster analyses resulted in two major geographic clusters of localities by song, and three major clusters by morphology. Clustering of PC1 scores, derived from a principal components analysis of combined variables, resulted in three major geographic clusters. Analysis of mtDNA restriction fragment patterns revealed two geographically-distinct haplotype groups. All analyses revealed two major clusters of localities, separated geographically by the McPherson Range.;Results suggested the following: (1) There was evidence for macrogeographic patterns in songs, based on the duration of the first song syllable. (2) Grouping of related mtDNA haplotypes indicated two mtDNA lineages, one southern and one northern, which probably diverged during a period of range disjunction and were now in secondary contact across approximately 450 km in southeastern Queensland. Differences in estimates of nucleotide diversity for these two lineages were comparable to differences in estimates for two forms of the Eastern Rosella (Platycercus adscitus and P. eximius), whose distributions overlap in approximately the same region. (3) Northern and southern stocks of P. striatus may have been isolated from each other due to fragmentation of eucalypt habitats during periods of severe aridity in the Plio-Pleistocene and earlier. (4) The McPherson Range and its rainforests have been a partial barrier to gene flow between northern and southern populations in this species. The contraction of the rainforest over the long term, and clearing and roadbuilding by humans in the surrounding eucalypt forests in this century, have presumably facilitated recontact.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
