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142918 - Marine reserve targets to sustain and rebuild unregulated fisheries.pdf (1.43 MB)
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Marine reserve targets to sustain and rebuild unregulated fisheries

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journal contribution
posted on 2023-05-20, 21:13 authored by Nils KrueckNils Krueck, Ahmadia, GN, Possingham, HP, Riginos, C, Treml, EA, Mumby, PJ
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% ªeffective protectionº 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.

History

Publication title

PLoS Biology

Volume

15

Article number

e2000537

Number

e2000537

Pagination

1-20

ISSN

1544-9173

Department/School

Institute for Marine and Antarctic Studies

Publisher

Public Library of Science

Place of publication

United States

Rights statement

Copyright 2017 Krueck et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Wild caught fin fish (excl. tuna); Coastal or estuarine biodiversity