Responses of urban reef corals during the 2016 mass bleaching event

Last modified: 
April 15, 2020 - 4:02pm
Type: Journal Article
Year of publication: 2020
Date published: 05/2020
Authors: Chin Ng, Danwei Huang, Kok Ben Toh, Shu Sam, Yuichi Kikuzawa, Tai Toh, Daisuke Taira, Yong Chan, Ling Hung, Wan Sim, Ahmad Rashid, Lutfi Afiq-Rosli, Ngan Ng, Loke Chou
Journal title: Marine Pollution Bulletin
Volume: 154
Pages: 111111
ISSN: 0025326X

Predicting the bleaching responses of corals is crucial in light of frequent heat stress events to manage further losses of biodiversity and ecosystem functioning, especially for reefs impacted by urbanisation. We examined if the coral cover and community at various Singapore sites changed during the 2016 global coral bleaching event. Bleaching prevalence varied widely among sites in June 2016, and was best explained by site and coral species. While some sites were minimally impacted, others registered significant decreases in coral cover and community changes persisting till March 2017, when normal colouration was mostly regained by corals. Bleaching susceptibility was associated with larger corallites in hermaphrodites and smaller corallites in gonochores (probably due to the cost of maintaining dual sexual functions in hermaphrodites), and with increasing proximity between polyps (likely because thermal damage would be less contained among polyps with greater physiological integration). However, bleaching resilience—the capacity to regain baseline pigmentation—was poorly explained by the traits studied. Our findings suggest that the interplay between local conditions and species composition strongly affects bleaching outcomes on urbanised reefs, and underscore the utility of coral traits for predicting bleaching responses to help in formulating appropriate management strategies.

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