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Extreme intraspecific mitochondrial DNA sequence divergence in Galaxias maculatus (Osteichthys: Galaxiidae), one of the world's most widespread freshwater fish

Citation

Waters, JM and Burridge, CP, Extreme intraspecific mitochondrial DNA sequence divergence in Galaxias maculatus (Osteichthys: Galaxiidae), one of the world's most widespread freshwater fish, Molecular Phylogenetics and Evolution, 11, (1) pp. 1-12. ISSN 1055-7903 (1999) [Refereed Article]

DOI: doi:10.1006/mpev.1998.0554

Abstract

Biogeographic controversies surrounding the widespread freshwater fish,Galaxias maculatus,were addressed with DNA sequence data. Mitochondrial cytochromeband 16S rRNA sequences were obtained from representatives of six populations of this species. Substantial levels of cytochromeb(maximum 14.6%) and 16S rRNA sequence divergence (maximum 6.0%) were detected between western Pacific (Tasmania-New Zealand) and South American (Chile-Falkland Islands) haplotypes. A considerable level of divergence was also detected between Tasmanian and New Zealand haplotypes (maximum 5.1%) and within and among Chilean and Falkland Island G. maculatus (maximum 3.8%). The phylogenetic structure of haplotypes conflicts with the accepted pattern of continental fragmentation. Molecular clock calibrations suggest that haplotype divergences postdate the fragmentation of Gondwana. These findings point to marine dispersal rather than ancient vicariance as an explanation for the wide distribution. The phylogenetic structure of South American haplotypes was not consistent with their geographic distribution. We consider factors such as population divergence, population size, dispersal, secondary contact, and philopatry as potential causes of the high level of mtDNA nucleotide diversity in this species. © 1999 Academic Press.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Waters, JM (Associate Professor Jon Waters)
Author:Burridge, CP (Dr Christopher Burridge)
ID Code:20201
Year Published:1999
Web of Science® Times Cited:75
Deposited By:Zoology
Deposited On:2000-08-01
Last Modified:2004-12-06
Downloads:0

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