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Seasonal occurrence and population structure of the broadnose sevengill shark Notorynchus cepedianus in coastal habitats of south-east Tasmania
Citation
Barnett, A and Stevens, JD and Frusher, SD and Semmens, JM, Seasonal occurrence and population structure of the broadnose sevengill shark Notorynchus cepedianus in coastal habitats of south-east Tasmania, Journal of Fish Biology, 77, (7) pp. 1688-1701. ISSN 0022-1112 (2010) [Refereed Article]
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Copyright Statement
The definitive published version is available online at: http://onlinelibrary.wiley.com/
Official URL: http://onlinelibrary.wiley.com/
DOI: doi:10.1111/j.1095-8649.2010.02810.x
Abstract
Research longline sampling was conducted seasonally from December 2006 to February 2009 to investigate the occurrence and population structure of the broadnose sevengill shark Notorynchus cepedianus in coastal areas of south-east Tasmania. Notorynchus cepedianus showed a consistent temporal trend in seasonal occurrence in Norfolk Bay characterized by high abundances in summer to near absence in winter. This pattern was less pronounced in the Derwent Estuary, where fish were still caught during winter. The absence of smaller total length (LT) classes (<80 cm) from the catches suggests that N. cepedianus are not using these coastal habitats as nursery areas. Of the 457 individuals tagged, 68 (15%) were recaptured. Time at liberty ranged from 6 days to almost
4 years and all but one of the recaptures were caught in its original tagging location, suggesting site fidelity. The large number of N. cepedianus in these coastal systems over summer indicates that these areas are important habitats for this species and that N. cepedianus may have a significant influence on community dynamics through both direct and indirect predator–prey interactions.
Item Details
Item Type: | Refereed Article |
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Keywords: | apex predator,CPUE,habitat use,shark nursery,tag and recapture |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Environmental Management |
Objective Group: | Terrestrial systems and management |
Objective Field: | Assessment and management of terrestrial ecosystems |
UTAS Author: | Barnett, A (Dr Adam Barnett) |
UTAS Author: | Frusher, SD (Professor Stewart Frusher) |
UTAS Author: | Semmens, JM (Professor Jayson Semmens) |
ID Code: | 66523 |
Year Published: | 2010 |
Web of Science® Times Cited: | 37 |
Deposited By: | TAFI - Marine Research Laboratory |
Deposited On: | 2011-02-01 |
Last Modified: | 2011-03-22 |
Downloads: | 4 View Download Statistics |
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