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Predator-prey relationships and foraging ecology of a marine apex predator with a wide temperate distribution

Citation

Barnett, A and Abrantes, K and Stevens, JD and Yick, JL and Frusher, SD and Semmens, JM, Predator-prey relationships and foraging ecology of a marine apex predator with a wide temperate distribution, Marine Ecology Progress Series, 416, (October) pp. 189-200. ISSN 0171-8630 (2010) [Refereed Article]


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Copyright Statement

Copyright © 2010 Inter-Research

Official URL: http://www.int-res.com/abstracts/meps/v416/p189-20...

DOI: doi:10.3354/meps08778

Abstract

The diet of the broadnose sevengill shark Notorynchus cepedianus was investigated over 3 years from 2 coastal locations in south-east Tasmania: the Derwent Estuary and Norfolk Bay. In general, individuals from both locations consumed the same broad dietary categories (sharks, batoids, teleosts and mammals). However, within these categories, species composition differed. Variations in chondrichthyan prey consumed matched estimations of prey abundance: Mustelus antarcticus was the primary prey in Norfolk Bay, where it was also the most abundant prey species; similarly, Squalus acanthias was an important prey and the most abundant in the Derwent Estuary. A decline in the catch rates of N. cepedianus and elasmobranch prey, in particular M. antarcticus over 3 years coincided with declines in dietary occurrence of M. antarcticus. Also, N. cepedianus and M. antarcticus abundances were both higher in Norfolk Bay than the Derwent Estuary. The correlation with diet and estimations of predator and prey relative abundance suggests N. cepedianus may move into coastal areas to exploit regular seasonal abundant resources, but they can also be versatile opportunistic predators that exploit a temporarily abundant resource.

Item Details

Item Type:Refereed Article
Keywords:Shark Notorynchus cepedianus, Diet,Spatial scale, Mustelus antarcticus
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
UTAS Author:Barnett, A (Dr Adam Barnett)
UTAS Author:Abrantes, K (Dr Katia Dos Santos Abrantes)
UTAS Author:Yick, JL (Mr Jonah Yick)
UTAS Author:Frusher, SD (Professor Stewart Frusher)
UTAS Author:Semmens, JM (Professor Jayson Semmens)
ID Code:66524
Year Published:2010
Web of Science® Times Cited:21
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2011-02-01
Last Modified:2011-07-27
Downloads:559 View Download Statistics

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