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Sustainable harvest regimes for magpie geese (Anseranas semipalmata) under spatial and temporal heterogeneity

Brook, Barry William and Whitehead, Peter J. (2005). Sustainable harvest regimes for magpie geese (Anseranas semipalmata) under spatial and temporal heterogeneity. Wildlife Research,32(5):459-464.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 15 times in Scopus Article | Citations

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Title Sustainable harvest regimes for magpie geese (Anseranas semipalmata) under spatial and temporal heterogeneity
Author Brook, Barry William
Whitehead, Peter J.
Journal Name Wildlife Research
Publication Date 2005
Volume Number 32
Issue Number 5
ISSN 1035-3712   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-25144443653
Start Page 459
End Page 464
Total Pages 6
Place of Publication Collingwood, Australia
Publisher Commonwealth Scientific and Industrial Research Organization
Field of Research 0608 - Zoology
HERDC Category C1 - Journal Article (DEST)
Abstract We developed a population model of magpie geese in the Northern Territory that considered spatial and temporal variation and related sources of uncertainty, building on previous analyses of the plausible rates of increase for this species. The model was used to explore realistic limits to recreational and indigenous harvest and to examine productive, yet risk-averse, management regimes for long-term sustainability. Harvest strategies based on a proportional off-take provided similar yields to a fixed quota system, but resulted in a reduced risk of substantial population decline. Moreover, higher harvests could be supported in model systems that incorporated dispersal phenomena consistent with patterns suggested by the observed distributional and abundance patterns. However, irrespective of harvest strategy and spatial structure, off-take at the levels implied in previously published analyses are clearly unsustainable. These results illustrate the desirability of matching the design of management systems to the heterogeneity of population processes. Management regimes that fail to take account of spatial and temporal heterogeneity could damage the interests of important stakeholder groups and potentially imperil the future viability of the species. However, the costs of disaggregated management systems may be substantial and benefits of investment in them need to be clearly demonstrated. Gaining better appreciation of spatial variation in harvests should be given high priority.
Keywords northern-territory
fluctuating environment
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