A decline in bleaching suggests that depth can provide a refuge from global warming in most coral taxa

Andrew H. Baird*, Joshua S. Madin, Mariana Álvarez-Noriega, Luisa Fontoura, James T. Kerry, Chao-Yang Kuo, Kristin Precoda, Damaris Torres-Pulliza, Rachael M. Woods, Kyle J. A. Zawada, Terry P. Hughes

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    Coral reefs are under increasing threat from increasing warm temperature stress. Coral bleaching is caused by a combination of heat and light anomalies and therefore fewer corals should bleach in areas where either heat or light anomalies are ameliorated, such as in turbid waters or at depth. Here, we explore the overall response of the coral assemblage and of 16 individual taxa to a thermal anomaly along a depth gradient during the 2016 mass bleaching event at sites on the outer shelf of the Northern Great Barrier Reef. Across all taxa, there was a curvilinear decline in the percentage of colonies bleached with depth that was consistent among sites and reflected the attenuation of light in the ocean. The percentage of colonies bleached was also higher on reefs with higher levels of temperature stress. In 10 taxa, including the abundant and ecologically significant Acropora, Pocillopora and Porites, the percentage of colonies bleached declined with depth. In 4 taxa, the percentage of colonies bleached peaked at intermediate depth. In 2 taxa, there was no effect of depth because bleaching was uniformly low. These data suggest that deeper areas of reef can provide a refuge from mass bleaching for many colonies of most taxa.

    Original languageEnglish
    Pages (from-to)257-264
    Number of pages8
    JournalMarine Ecology Progress Series
    Volume603
    DOIs
    Publication statusPublished - 17 Sep 2018

    Bibliographical note

    © Inter-Research 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • climate change
    • global warming
    • coral reefs
    • depth zonation
    • disturbance
    • recovery

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