MEPS 576:55-68 (2017)  -  DOI: https://doi.org/10.3354/meps12221

Habitat change mediates the response of coral reef fish populations to terrestrial run-off

Christopher J. Brown1,*, Stacy D. Jupiter2, Hsien-Yung Lin3, Simon Albert4, Carissa Klein5, Joseph M. Maina3,6, Vivitskaia J. D. Tulloch3, Amelia S. Wenger5, Peter J. Mumby7

1Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
2Wildlife Conservation Society, Melanesia Program, 11 Ma’afu Street, Suva, Fiji
3Centre for Biodiversity and Conservation Science, School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
4School of Civil Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
5School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
6Department of Environmental Sciences, Macquarie University, Sydney, NSW 2109, Australia
7Marine Spatial Ecology Laboratory, School of Biological Sciences, Goddard Building, The University of Queensland, St Lucia, QLD 4072, Australia
*Corresponding author:

ABSTRACT: Coastal fish populations are typically threatened by multiple human activities, including fishing pressure and run-off of terrestrial pollution. Linking multiple threats to their impacts on fish populations is challenging because the threats may influence a species directly, or indirectly, via its habitats and its interactions with other species. Here we examine spatial variation in abundance of coral reef fish across gradients of fishing pressure and turbidity in Fiji. We explicitly account for multiple pathways of influence to test the alternative hypotheses that (1) habitat moderates predation by providing shelter, so habitat loss only affects prey fish populations if there are abundant predators, (2) habitat change co-drives biomass of both prey and predator functional groups. We examined responses of 7 fish functional groups and found that habitat change co-drives both predator and prey responses to turbidity. Abundances of all functional groups were associated with changes in habitat cover; however, the responses of their habitats to turbidity were mixed. Planktivore and piscivore abundance were lower in areas of high turbidity, because cover of their preferred habitats was lower. Invertivore, browser and grazer abundance did not change strongly over the turbidity gradient, because different components of their habitats exhibited both increases and decreases with turbidity. The effects of turbidity on fish populations were minor in areas where fish populations were already depleted by fishing. These findings suggest that terrestrial run-off modifies the composition of reef fish communities indirectly by affecting the benthic habitats that reef fish use.


KEY WORDS: Coral reef fisheries · Integrated coastal management · Land-use change · Fiji · Trophic-cascade


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Cite this article as: Brown CJ, Jupiter SD, Lin HY, Albert S and others (2017) Habitat change mediates the response of coral reef fish populations to terrestrial run-off. Mar Ecol Prog Ser 576:55-68. https://doi.org/10.3354/meps12221

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