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Ecological-economic models of sustainable harvest for an endangered but exotic megaherbivore in northern Australia

Bradshaw, Corey J. A. and Brook, Barry William (2007). Ecological-economic models of sustainable harvest for an endangered but exotic megaherbivore in northern Australia. Natural Resource Modeling,20(1):129-156.

Document type: Journal Article
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IRMA ID A00003xPUB66
Title Ecological-economic models of sustainable harvest for an endangered but exotic megaherbivore in northern Australia
Author Bradshaw, Corey J. A.
Brook, Barry William
Journal Name Natural Resource Modeling
Publication Date 2007
Volume Number 20
Issue Number 1
ISSN 0890-8575   (check CDU catalogue open catalogue search in new window)
Start Page 129
End Page 156
Total Pages 28
Place of Publication Tempe, United States of America
Publisher Rocky Mountain Mathematics consortium
Field of Research 0102 - Applied Mathematics
HERDC Category C1 - Journal Article (DEST)
Abstract How can one manage wildlife under a suite of competing values? In isolation, the ecological economics of native wildlife harvest, threatened species conservation and control of exotic species are all well established sub-disciplines of wildlife management. However, the wild banteng (Bos javanicus) population of northern Australia represents an interesting combination of these aspirations. A native bovid of Southeast Asia now `endangered' in its native range, banteng were introduced into northern Australia in 1849. Today, a population of 8,000-10,000 resides on one small, isolated peninsula in western Arnhem Land, Northern Territory and is harvested by both recreational (trophy) and aboriginal subsistence hunters. Indigenous, industry and conservationist stakeholders differ in their requirements for population management. Here we analyze the ecological and economic costs/benefits of a series of potential harvest management options for Australia's banteng population, with the aim being either to: (1) maximize sustainable yield (MSY); (2) maximize harvest of trophy males; (3) maximize indigenous off take; (4) suppress density or completely eradicate the population; (5) minimize risk of extinction whilst limiting range expansion; (6) scenarios incorporating two or more of options 1-5. The modeling framework employed stochastic; density-regulated matrix population models with life-history parameters derived from (i) allometric relationships (for estimating r(max), generation length, fecundity and densities for a banteng-sized mammal) and (ii) measured vital rates for wild and captive banteng arid other Bos spp. For each management option, we present a simple economic analysis that incorporates estimated costs of management implementation and associated profits projected. Results demonstrate that revenue of >AU$200,000 is possible from meat production and safari hunting without compromising long-term population stability or the conservation status of this endangered bovid.
Keywords aboriginal
Leslie matrix
ecosystem health
demographic stochasticity
conservation biology
density dependence
extinction crisis
national park
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