Terrestrial degradation impacts on coral reef health: evidence from the Caribbean

Roberts, M., Hanley, N. , Williams, S. and Cresswell, W. (2017) Terrestrial degradation impacts on coral reef health: evidence from the Caribbean. Ocean and Coastal Management, 149, pp. 52-68. (doi: 10.1016/j.ocecoaman.2017.09.005)

Abstract

Coral reefs are in decline worldwide. While coral reef managers are limited in their ability to tackle global challenges, such as ocean warming, managing local threats can increase the resilience of coral reefs to these global threats. One such local threat is high sediment inputs to coastal waters due to terrestrial over-grazing. Increases in terrestrial sediment input into coral reefs are associated with increased coral mortality, reduced growth rates, and changes in species composition, as well as alterations to fish communities. We used general linear models to investigate the link between vegetation ground cover and tree biomass index, within a dry-forest ecosystem, to coral cover, fish communities and visibility in the case study site of Bonaire, Caribbean Netherlands. We found a positive relationship between ground cover and coral cover below 10 m depth, and a negative relationship between tree biomass index and coral cover below 10 m. Greater ground cover is associated to sediment anchored through root systems, and higher surface complexity, slowing water flow, which would otherwise transport sediment. The negative relationship between tree biomass index and coral cover is unexpected, and may be a result of the deep roots associated with dry-forest trees, due to limited availability of water, which therefore do not anchor surface sediment, or contribute to surface complexity. Our analysis provides evidence that coral reef managers could improve reef health through engaging in terrestrial ecosystem protection, for example by taking steps to reduce grazing pressures, or in restoring degraded forest ecosystems.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hanley, Professor Nicholas
• Authors: Roberts, M., Hanley, N., Williams, S., and Cresswell, W.
• College/School: College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
• Journal Name: Ocean and Coastal Management
• Publisher: Elsevier
• ISSN: 0964-5691
• ISSN (Online): 1873-524X
• Published Online: 26 September 2017
• Copyright Holders: Copyright © 2017 Elsevier Ltd.
• First Published: First published in Ocean and Coastal Management 149:52-68
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.