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Trophic effects of fishing southern rock lobster Jasus edwardsii shown by combined fatty acid and stable isotope analyses

Guest, M.A., Nichols, P.D., Johnson, C.R. and Wheatley, K.E. 2009, Trophic effects of fishing southern rock lobster Jasus edwardsii shown by combined fatty acid and stable isotope analyses, Marine ecology progress series, vol. 388, pp. 169-184, doi: 10.3354/meps08096.

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Title Trophic effects of fishing southern rock lobster Jasus edwardsii shown by combined fatty acid and stable isotope analyses
Author(s) Guest, M.A.
Nichols, P.D.
Johnson, C.R.
Wheatley, K.E.
Journal name Marine ecology progress series
Volume number 388
Start page 169
End page 184
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2009-08-19
ISSN 0171-8630
1616-1599
Keyword(s) effects of fishing
fatty acids
stable isotopes
marine protected areas
food webs
Summary The southern rock lobster Jasus edwardsii is a commercial species that has benefited from the complete protection offered by no-take reserves, with higher abundances and larger animals recorded in reserves than in adjacent fished areas. What remains unclear is whether there is any change in the diet of lobsters in reserves, for example, as a result of increased intraspecific competition for food. We used combined chemical tracers to examine the diet of lobsters in fished and reserve areas in 2 bioregions in eastern Tasmania. δ15N values of lobsters were richer in fished than in reserve areas, indicating that lobsters eat a greater proportion of food items from higher trophic levels in fished areas. Mixing models suggest that ascidians, sea urchins and the turbinid gastropod were all important food sources for lobsters, but the importance of these food items differed between bioregions. This spatial variability may suggest that the small size of the reserve in one bioregion is inadequate at ensuring the diet of lobsters is protected from fishing pressure. Fatty acid profiles of lobsters supported the importance of these food sources to lobsters. Differences between bioregions, or inside and outside of reserves, were not apparent using fatty acids. The present study highlights that lobster fishing has the capacity to alter the trophic status of prey for generalist predators and suggests that fatty acid analyses may be limited in detecting changes in the dietary composition of such generalist feeders.
Language eng
DOI 10.3354/meps08096
Field of Research 070403 Fisheries Management
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Inter-Research
Persistent URL http://hdl.handle.net/10536/DRO/DU:30039820

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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