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The role of the ord arid intrusion in the historical and contemporary genetic division of long-tailed finch subspecies in northern Australia

Rollins, Lee A., Svedin, Nina, Pryke, Sarah R. and Griffith, Simon C. 2012, The role of the ord arid intrusion in the historical and contemporary genetic division of long-tailed finch subspecies in northern Australia, Ecology and evolution, vol. 2, no. 6, pp. 1208-1219, doi: 10.1002/ece3.259.

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Title The role of the ord arid intrusion in the historical and contemporary genetic division of long-tailed finch subspecies in northern Australia
Author(s) Rollins, Lee A.ORCID iD for Rollins, Lee A. orcid.org/0000-0002-3279-7005
Svedin, Nina
Pryke, Sarah R.
Griffith, Simon C.
Journal name Ecology and evolution
Volume number 2
Issue number 6
Start page 1208
End page 1219
Total pages 12
Publisher John Wiley
Place of publication West Sussex, England
Publication date 2012
ISSN 2045-7758
Keyword(s) Long-tailed finch
microsatellite
mitochondrial control region
northern Australian biogeography
Ord Arid Intrusion
Poephila acuticauda
Summary The effect of separation by biogeographic features followed by secondary contact can blur taxonomic boundaries and produce complex genetic signatures. We analyzed population structure and gene flow across the range of the long-tailed finch (Poephila acuticauda) in northern Australia (1) to test the hypothesis that Ord Arid Intrusion acted as the causative barrier that led to divergence of P. acuticauda subspecies, (2) to determine whether genetic data support the presence of a gradual cline across the range or a sudden shift, both of which have been suggested based on morphological data, and (3) to estimate levels of contemporary gene flow within this species complex. We collected samples from 302 individuals from 10 localities. Analyses of 12 microsatellite loci and sequence data from 333 base pairs of the mitochondrial control region were used to estimate population structure and gene flow, using analysis of molecular variance (AMOVA), haplotype network analysis, frequency statistics, and clustering methods. Mitochondrial sequence data indicated the presence of three genetic groups (regions) across the range of P. acuticauda. Genetic diversity was highest in the east and lowest in the west. The Ord Arid Intrusion appears to have functioned as a biogeographic barrier in the past, according to mtDNA evidence presented here and evidence from previous studies. The absence of isolation by distance between adjacent regions and the lack of population genetic structure of mtDNA within regions indicates that genetic changes across the range of P. acuticauda subspecies are characterized by discrete breaks between regions. While microsatellite data indicate a complete absence of genetic structure across this species’ range, it appears unlikely that this results from high levels of gene flow. Mitochondrial data do not support the presence of contemporary gene flow across the range of this species.
Language eng
DOI 10.1002/ece3.259
Field of Research 060411 Population, Ecological and Evolutionary Genetics
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, Blackwell Publishing
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30046938

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.