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PLoS One. 2016 Feb 4;11(2):e0146855. doi: 10.1371/journal.pone.0146855. eCollection 2016.

Effects of Protection and Sediment Stress on Coral Reefs in Saint Lucia.

Author information

1
Department of Biological Sciences, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada.
2
GEOMAR, Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105, Kiel, Germany.
3
Laboratoire d'Excellence 'CORAIL' and USR 3278 CRIOBE EPHE-CNRS-UPVD, 58 Av. Paul Alduy, 66860 Perpignan Cedex, France.
4
Environment Department, University of York, Heslington, York, YO10 5DD, United Kingdom.

Abstract

The extent to which Marine Protected Areas (MPAs) benefit corals is contentious. On one hand, MPAs could enhance coral growth and survival through increases in herbivory within their borders; on the other, they are unlikely to prevent disturbances, such as terrestrial runoff, that originate outside their boundaries. We examined the effect of spatial protection and terrestrial sediment on the benthic composition of coral reefs in Saint Lucia. In 2011 (10 to 16 years after MPAs were created), we resurveyed 21 reefs that had been surveyed in 2001 and analyzed current benthic assemblages as well as changes in benthic cover over that decade in relation to protection status, terrestrial sediment influence (measured as the proportion of terrigenous material in reef-associated sediment) and depth. The cover of all benthic biotic components has changed significantly over the decade, including a decline in coral and increase in macroalgae. Protection status was not a significant predictor of either current benthic composition or changes in composition, but current cover and change in cover of several components were related to terrigenous content of sediment deposited recently. Sites with a higher proportion of terrigenous sediment had lower current coral cover, higher macroalgal cover and greater coral declines. Our results suggest that terrestrial sediment is an important factor in the recent degradation of coral reefs in Saint Lucia and that the current MPA network should be complemented by measures to reduce runoff from land.

PMID:
26845451
PMCID:
PMC4742058
DOI:
10.1371/journal.pone.0146855
[Indexed for MEDLINE]
Free PMC Article

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