Designing marine reserves for biodiversity and sustainable fisheries R. Quentin Grafton and Tom Kompas Crawford School of Economics and Government CERF.

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Presentation transcript:

Designing marine reserves for biodiversity and sustainable fisheries R. Quentin Grafton and Tom Kompas Crawford School of Economics and Government CERF Project/CERF Hub Presentation 20 May 2008 Acknowledgement: DEWHA

Motivation Marine reserves as a management tool are receiving increasing attention in response to growth, recruitment and economic over-harvesting and mismanagement of marine resources. In response to perceived problems in fisheries management, fisheries scientists increasingly argue for an ecosystem-based approach to fisheries that includes the increased use of marine reserves. Despite potential benefits (population persistence, biodiversity and habitat protection, age structure & spillovers), many fishers oppose reserves and claim they do not generate an economic payoff (rather, losses in GVP and profits).

Preliminary Results Reserves have positive economic value under environmental uncertainty (i.e., increase profitability), even if harvesting is optimal and probability and occurrence of negative shocks known in advance. Payoff arises from spillovers that increase harvest immediately after a shock and reduced recovery time – a ‘resilience effect’. Resource rents (compared to no reserve case) are increasing in size and frequency of negative shocks. Reserves are valuable because they act as buffers following a negative shock that allows additional harvesting because of transfers from reserve.

What is the Optimal Reserve Size? The answer will vary across populations and potential biodiversity and environmental benefits-- requires a bioeconomic model to explicitly account for uncertainty. Results from two examples (economic profitability only): BC Halibut Fishery Northern Cod Fishery

BC Halibut (resilience effect)

Northern Cod (sustainability)

Future CERF work Apply to several Australian Fisheries (NPF and SETF) Show how the loss in GVP exaggerates ‘damages’ from MPAs, by not measuring increased profitability in response to negative shocks. Construct spatial models of MPAs Measure the added benefits of marine biodiversity