Mixed-marker approach suggests maternal philopatry and sex-biased behaviours of narrow sawfish Anoxypristis cuspidata

Green, Madeline E., D'Anastasi, Blanche R., Hobbs, Jean-Paul A., Feldheim, Kevin, McAuley, Rory, Peverell, Stirling, Stapley, Jason, Johnson, Grant, Appleyard, Sharon A., White, William T., Simpfendorfer, Colin A., and van Herwerden, Lynne (2018) Mixed-marker approach suggests maternal philopatry and sex-biased behaviours of narrow sawfish Anoxypristis cuspidata. Endangered Species Research, 37. pp. 45-54.

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The narrow sawfish Anoxypristis cuspidata belongs to the most endangered family of chondrichthyan fishes, the sawfishes (Pristidae). This species has undergone significant declines in geographic range and abundance due to anthropogenic activities including fishing and habitat destruction. Very little is known of adult movements within its distribution. In order to better manage and protect this endangered species, understanding patterns of habitat use, connectivity and behaviour is important. Using a combination of partial mitochondrial sequences (control region [CR] and NADH dehydrogenase 4 [ND4]) and nuclear markers (microsatellites), this study assessed the genetic population structure of A. cuspidata in Australia and Papua New Guinea. Significant population structuring using mitochondrial DNA was found between the east Australian coast, Gulf of Papua and Gulf of Carpentaria (using concatenated CR and ND4 markers) (analysis of molecular variance [AMOVA], ΦST = 0.082, p = <0.001). In contrast, no population structure was evident across northern Australia using nuclear microsatellite loci (FST = 0.012, p = 1.000). Our results suggest that a combination of historic genetic drift, maternal natal philopatry and possible male-biased dispersal likely drive the genetic patterns observed. Given the endangered status and lack of knowledge for A. cuspidata, this study presents important insights that may be used to inform management efforts.

Item ID: 55921
Item Type: Article (Research - C1)
ISSN: 1613-4796
Keywords: Pristidae, genetics, Indo-Pacific, mitochondrial DNA, microsatellites
Copyright Information: © The authors 2018. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are unrestricted. Authors and original publication must be credited.
Funders: James Cook University (JCU), Australian Geographic Bayer Boost Society, Australian Centre for International Agricultural Research (ACIAR), Papua New Guinea National Fisheries Authority (PNGNFA), Commonwealth Scientific and Industrial Research Organisation (CSIRO), Sea World Research and Rescue Foundation, Holsworth Wildlife Research Endowment
Projects and Grants: ACIAR project FIS/2012/102
Date Deposited: 24 Oct 2018 07:50
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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