Pleistocene divergence across a mountain range and the influence of selection on mitogenome evolution in threatened Australian freshwater cod species

Harrisson, K, Pavlova, A, Gan, HM, Lee, YP, Austin, CM and Sunnucks, P 2016, Pleistocene divergence across a mountain range and the influence of selection on mitogenome evolution in threatened Australian freshwater cod species, Heredity, vol. 116, no. 6, pp. 506-515, doi: 10.1038/hdy.2016.8.

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Title Pleistocene divergence across a mountain range and the influence of selection on mitogenome evolution in threatened Australian freshwater cod species
Author(s) Harrisson, K
Pavlova, A
Gan, HM
Lee, YP
Austin, CMORCID iD for Austin, CM orcid.org/0000-0003-1848-6267
Sunnucks, P
Journal name Heredity
Volume number 116
Issue number 6
Start page 506
End page 515
Total pages 10
Publisher Nature Publishing Group
Place of publication London, Eng.
Publication date 2016-06
ISSN 0018-067X
1365-2540
Summary Climatic differences across a taxon's range may be associated with specific bioenergetic demands and may result in genetics-based metabolic adaptation, particularly in aquatic ectothermic organisms that rely on heat exchange with the environment to regulate key physiological processes. Extending down the east coast of Australia, the Great Dividing Range (GDR) has a strong influence on climate and the evolutionary history of freshwater fish species. Despite the GDR acting as a strong contemporary barrier to fish movement, many species, and species with shared ancestries, are found on both sides of the GDR, indicative of historical dispersal events. We sequenced complete mitogenomes from the four extant species of the freshwater cod genus Maccullochella, two of which occur on the semi-arid, inland side of the GDR, and two on the mesic coastal side. We constructed a dated phylogeny and explored the relative influences of purifying and positive selection in the evolution of mitogenome divergence among species. Results supported mid- to late-Pleistocene divergence of Maccullochella across the GDR (220-710 thousand years ago), bringing forward previously reported dates. Against a background of pervasive purifying selection, we detected potentially functionally relevant fixed amino acid differences across the GDR. Although many amino acid differences between inland and coastal species may have become fixed under relaxed purifying selection in coastal environments rather than positive selection, there was evidence of episodic positive selection acting on specific codons in the Mary River coastal lineage, which has consistently experienced the warmest and least extreme climate in the genus.
Language eng
DOI 10.1038/hdy.2016.8
Field of Research 060305 Evolution of Developmental Systems
060403 Developmental Genetics (incl Sex Determination)
0604 Genetics
0603 Evolutionary Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Macmillan Publishers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30091054

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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