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  • Cinner et al. 2018 PNAS accepted

    Rights statement: Copyright © 2018 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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Gravity of human impacts mediates coral reef conservation gains

Research output: Contribution to journalJournal articlepeer-review

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  • Joshua Cinner
  • E Marie
  • C Huchery
  • MA MacNeil
  • C Mora
  • TR McClanahan
  • ML Barnes
  • JN Kittinger
  • S D'Agata
  • AS Hoey
  • GG Gurney
  • DA Feary
  • ID Williams
  • M Kulbicki
  • L Vigliola
  • L Wantiez
  • GJ Edgar
  • RD Stuart-Smith
  • SA Sandin
  • A Green
  • MJ Hardt
  • M Beger
  • AM Friedlander
  • SK Wilson
  • E Brokovich
  • AJ Brooks
  • JJ Cruz-Motta
  • DJ Booth
  • P Chabanet
  • C Gough
  • M Tupper
  • SCA Ferse
  • UR Sumaila
  • S Pardede
  • D Mouillot
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<mark>Journal publication date</mark>3/07/2018
<mark>Journal</mark>Proceedings of the National Academy of Sciences of the United States of America
Issue number27
Volume115
Number of pages10
Pages (from-to)E6116-E6125
Publication StatusPublished
Early online date18/06/18
<mark>Original language</mark>English

Abstract

Coral reefs provide ecosystem goods and services for millions of people in the tropics, but reef conditions are declining worldwide. Effective solutions to the crisis facing coral reefs depend in part on understanding the context under which different types of conservation benefits can be maximized. Our global analysis of nearly 1,800 tropical reefs reveals how the intensity of human impacts in the surrounding seascape, measured as a function of human population size and accessibility to reefs (“gravity”), diminishes the effectiveness of marine reserves at sustaining reef fish biomass and the presence of top predators, even where compliance with reserve rules is high. Critically, fish biomass in high-compliance marine reserves located where human impacts were intensive tended to be less than a quarter that of reserves where human impacts were low. Similarly, the probability of encountering top predators on reefs with high human impacts was close to zero, even in high-compliance marine reserves. However, we find that the relative difference between openly fished sites and reserves (what we refer to as conservation gains) are highest for fish biomass (excluding predators) where human impacts are moderate and for top predators where human impacts are low. Our results illustrate critical ecological trade-offs in meeting key conservation objectives: reserves placed where there are moderate-to-high human impacts can provide substantial conservation gains for fish biomass, yet they are unlikely to support key ecosystem functions like higher-order predation, which is more prevalent in reserve locations with low human impacts.

Bibliographic note

Copyright © 2018 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).