Isolation and genetic diversity of endangered grey nurse shark (Carcharias taurus) populations

Stow, Adam, Zenger, Kyall, Briscoe, David, Gillings, Michael, Peddemors, Victor, Otway, Nicholas, and Harcourt, Robert (2006) Isolation and genetic diversity of endangered grey nurse shark (Carcharias taurus) populations. Biology Letters, 2 (2). pp. 308-311.

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Abstract

Anthropogenic impacts are believed to be the primary threats to the eastern Australian population of grey nurse sharks (Carcharias taurus), which is listed as critically endangered, and the most threatened population globally. Analyses of 235 polymorphic amplified fragment length polymorphisms (AFLP) loci and 700 base pairs of mitochondrial DNA control region provide the first account of genetic variation and geographical partitioning (east and west coasts of Australia, South Africa) in C. taurus. Assignment tests, analysis of relatedness and Fst values all indicate that the Australian populations are isolated from South Africa, with negligible migration between the east and west Australian coasts. There are significant differences in levels of genetic variation among regions. Australian C. taurus, particularly the eastern population, has significantly less AFLP variation than the other sampling localities. Further, the eastern Australian sharks possess only a single mitochondrial haplotype, also suggesting a small number of founding individuals. Therefore, historical, rather than anthropogenic processes most likely account for their depauperate genetic variation. These findings have implications for the viability of the eastern Australian population of grey nurse sharks.

Item ID: 9790
Item Type: Article (Refereed Research - C1)
Keywords: Carcharias taurus; low genetic variation; migration; animal conservation and population genetics
ISSN: 1744-957X
Date Deposited: 30 Mar 2010 22:48
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 90%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060408 Genomics @ 10%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 10%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 90%
Citation Count from Web of Science Web of Science 30
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