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Skeletal records of community-level bleaching in Porites corals from Palau

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Abstract

Tropical Pacific sea surface temperature is projected to rise an additional 2–3 °C by the end of this century, driving an increase in the frequency and intensity of coral bleaching. With significant global coral reef cover already lost due to bleaching-induced mortality, efforts are underway to identify thermally tolerant coral communities that might survive projected warming. Massive, long-lived corals accrete skeletal bands of anomalously high density in response to episodes of thermal stress. These “stress bands” are potentially valuable proxies for thermal tolerance, but to date their application to questions of community bleaching history has been limited. Ecological surveys recorded bleaching of coral communities across the Palau archipelago during the 1998 and 2010 warm events. Between 2011 and 2015, we extracted skeletal cores from living Porites colonies at 10 sites spanning barrier reef and lagoon environments and quantified the proportion of stress bands present in each population during bleaching years. Across Palau, the prevalence of stress bands tracked the severity of thermal stress, with more stress bands occurring in 1998 (degree heating weeks = 13.57 °C-week) than during the less severe 2010 event (degree heating weeks = 4.86 °C-week). Stress band prevalence also varied by reef type, as more corals on the exposed barrier reef formed stress bands than did corals from sheltered lagoon environments. Comparison of Porites stress band prevalence with bleaching survey data revealed a strong correlation between percent community bleaching and the proportion of colonies with stress bands in each year. Conversely, annual calcification rates did not decline consistently during bleaching years nor did annually resolved calcification histories always track interannual variability in temperature. Our data suggest that stress bands in massive corals contain valuable information about spatial and temporal trends in coral reef bleaching and can aid in conservation efforts to identify temperature-tolerant coral reef communities.

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Acknowledgments

The authors thank Y. Golbuu, T. DeCarlo, G.P. Lohmann, K. Pietro, K. Karnauskas, S. Lentz, D. McCorkle, A. Shalapyonok, D. Ketten, J. Arruda, S. Cramer, C. MacDonald, G. Mereb, A. Merep, M. Kaplan, and the staff of the Palau International Coral Reef Center for assistance with fieldwork and analyses. This work was supported by a NSF Graduate Research Fellowship and a Next Wave Fellowship to H. Barkley, National Science Foundation award OCE-1031971, the Dalio Foundation, Inc., through the Dalio Explore Fund, Ray Dalio through the WHOI Access to the Sea Fund, the Tiffany & Co. Foundation, and the Nature Conservancy.

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Authors and Affiliations

  1. Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, Woods Hole, MA, 02543, USA

    Hannah C. Barkley

  2. Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA

    Anne L. Cohen

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  1. Hannah C. Barkley
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Correspondence to Hannah C. Barkley.

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Barkley, H.C., Cohen, A.L. Skeletal records of community-level bleaching in Porites corals from Palau. Coral Reefs 35, 1407–1417 (2016). https://doi.org/10.1007/s00338-016-1483-3

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