Marine reserve targets to sustain and rebuild unregulated fisheries

Krueck, Nils C., Ahmadia, Gabby N., Possingham, Hugh P., Riginos, Cynthia, Treml, Eric A. and Mumby, Peter J. (2017) Marine reserve targets to sustain and rebuild unregulated fisheries. PLoS Biology, 15 1: . doi:10.1371/journal.pbio.2000537


Author Krueck, Nils C.
Ahmadia, Gabby N.
Possingham, Hugh P.
Riginos, Cynthia
Treml, Eric A.
Mumby, Peter J.
Title Marine reserve targets to sustain and rebuild unregulated fisheries
Journal name PLoS Biology   Check publisher's open access policy
ISSN 1545-7885
Publication date 2017-01-05
Sub-type Article (original research)
DOI 10.1371/journal.pbio.2000537
Open Access Status DOI
Volume 15
Issue 1
Total pages 20
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Language eng
Abstract Overfishing threatens the sustainability of coastal marine biodiversity, especially in tropical developing countries. To counter this problem, about 200 governments worldwide have committed to protecting 10%–20% of national coastal marine areas. However, associated impacts on fisheries productivity are unclear and could weaken the food security of hundreds of millions of people who depend on diverse and largely unregulated fishing activities. Here, we present a systematic theoretic analysis of the ability of reserves to rebuild fisheries under such complex conditions, and we identify maximum reserve coverages for biodiversity conservation that do not impair long-term fisheries productivity. Our analysis assumes that fishers have no viable alternative to fishing, such that total fishing effort remains constant (at best). We find that realistic reserve networks, which protect 10%–30% of fished habitats in 1–20 km wide reserves, should benefit the long-term productivity of almost any complex fishery. We discover a “rule of thumb” to safeguard against the long-term catch depletion of particular species: individual reserves should export 30% or more of locally produced larvae to adjacent fishing grounds. Specifically on coral reefs, where fishers tend to overexploit species whose dispersal distances as larvae exceed the home ranges of adults, decisions on the size of reserves needed to meet the 30% larval export rule are unlikely to compromise the protection of resident adults. Even achieving the modest Aichi Target 11 of 10% “effective protection” can then help rebuild depleted catch. However, strictly protecting 20%–30% of fished habitats is unlikely to diminish catch even if overfishing is not yet a problem while providing greater potential for biodiversity conservation and fishery rebuilding if overfishing is substantial. These findings are important because they suggest that doubling or tripling the only globally enforced marine reserve target will benefit biodiversity conservation and higher fisheries productivity where both are most urgently needed.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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