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Gravity of human impacts mediates coral reef conservation gains


Cinner, JE and Maire, E and Huchery, C and MacNeil, MA and Graham, NAJ and Mora, C and McClanahan, TR and Barnes, ML and Kittinger, JN and Hicks, CC and D'Agata, S and Hoey, AS and Gurney, GG and Feary, DA and Williams, ID and Kulbicki, M and Vigliola, L and Wantiez, L and Edgar, GJ and Stuart-Smith, RD and Sandin, SA and Green, A and Hardt, MJ and Beger, M and Friedlander, AM and Wilson, SK and Brokovich, E and Brooks, AJ and Cruz-Motta, JJ and Booth, DJ and Chabanet, P and Gough, C and Tupper, M and Ferse, SCA and Sumaila, UR and Pardede, S and Mouillot, D, Gravity of human impacts mediates coral reef conservation gains, Proceedings of the National Academy of Sciences of the United States of America, 115, (27) pp. E6116-E6125. ISSN 0027-8424 (2018) [Refereed Article]


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Copyright 2018 The Authors Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

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DOI: doi:10.1073/pnas.1708001115


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.

Item Details

Item Type:Refereed Article
Keywords:Reef Life Survey, MPA, reef fish, climate change, citizen science, marine reserves, fisheries, coral reefs, social-ecological, socioeconomic
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Edgar, GJ (Professor Graham Edgar)
UTAS Author:Stuart-Smith, RD (Dr Rick Stuart-Smith)
ID Code:127234
Year Published:2018
Funding Support:Australian Research Council (LP100200122)
Web of Science® Times Cited:138
Deposited By:Ecology and Biodiversity
Deposited On:2018-07-18
Last Modified:2018-11-15
Downloads:217 View Download Statistics

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