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      The 2014-17 Global Coral Bleaching Event: The Most Severe and Widespread Coral Reef Destruction

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          Abstract

          Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local effects of these events have been widely reported, the global implications remain unknown. Analysis of 15,066 reef surveys during 2014-2017 revealed that 80% of surveyed reefs experienced significant coral bleaching and 35% experienced significant coral mortality. The global extent of significant coral bleaching and mortality was assessed by extrapolating results from reef surveys using comprehensive remote-sensing data of regional heat stress. This model predicted that 51% of the world’s coral reefs suffered significant bleaching and 15% significant mortality, surpassing damage from any prior global bleaching event. These observations demonstrate that global warming’s widespread damage to coral reefs is accelerating and underscores the threat anthropogenic climate change poses for the irreversible transformation of these essential ecosystems.

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          Author and article information

          Contributors
          Journal
          Research Square
          June 06 2022
          Affiliations
          [1 ]National Oceanic and Atmospheric Administration
          [2 ]Coral Reef Watch, Center for Satellite Applications and Research, U.S. National Oceanic and Atmospheric Administration
          [3 ]James Cook University
          [4 ]Smithsonian Tropical Research Institute
          [5 ]Coral Reef Watch, U.S. National Oceanic and Atmospheric Administration
          [6 ]Greater Atlantic Regional Office, U.S. National Oceanic and Atmospheric Administration Fisheries
          [7 ]Australian Institute of Marine Science
          [8 ]Cooperative Institute for Marine and Atmospheric Research, University of Hawaii at Manoa
          [9 ]University of British Columbia
          [10 ]CORDIO East Africa
          [11 ]ARC Centre of Excellence For Coral Reef Studies, James Cook University
          [12 ]Coral Reef Consultants LLC
          [13 ]The University of Queensland
          [14 ]ARC Centre of Excellence For Coral Reef Studies
          [15 ]ARC Centre of Excellence for Coral Reef Studies, James Cook University
          [16 ]National Parks of Eastern North Carolina
          [17 ]Reef Check Foundation
          [18 ]Laboratorio de Ecología de Ecosistemas de Arrecifes Coralinos, Departamento de Recursos del Mar, Centro de Investigación y de Estudios Avanzados del I.P.N.
          [19 ]Department of Biodiversity, Conservation and Attractions
          [20 ]Fish and Wildlife Research Institute
          [21 ]National Centers for Coastal Ocean Science, U.S. National Oceanic and Atmospheric Administration
          [22 ]International Center for Coral Reef Research and Restoration, Mote Marine Laboratory
          [23 ]ReefSense
          [24 ]Office of Coast Survey, U.S. National Oceanic and Atmospheric Administration
          [25 ]University of California, Santa Barbara
          [26 ]School of Geography, Earth and Atmospheric Sciences, Faculty of Science, The University of Melbourne
          [27 ]Department of Marine Biology, Science and Research Branch, Azad University
          [28 ]Universidad Nacional Autónoma de México
          [29 ]Texas A&M University, Corpus Christi
          [30 ]Ningaloo Marine Park, Parks and Wildlife Service – Exmouth District, Department of Biodiversity, Conservation and Attractions
          [31 ]Institute of Science, Technology and Innovation, Universidad Francisco Gavidia
          [32 ]University of Victoria
          [33 ]Halmos College of Natural Sciences and Oceanography, Department of Marine and Environmental Science, Nova Southeastern University
          [34 ]"School of Biology, Faculty of Biological Sciences, University of Leeds
          [35 ]Fisheries and Oceans Canada
          [36 ]Commonwealth Scientific and Industrial Research Organisation
          [37 ]Entropie (IRD, UR, CNRS, UNC, IFREMER), Labex CORAIL, IRD-University of La Réunion
          [38 ]Reef Explorer Fiji
          [39 ]University of Copenhagen
          [40 ]University of Guam Marine Laboratory
          [41 ]The Seychelles Islands Foundation
          [42 ]New York University Abu Dhabi
          [43 ]"CoraLogic Environmental Consulting
          [44 ]Stanford University
          [45 ]Centre de Recherches Insulaires et Observatoire de l'Environnement)/SNO Corail
          [46 ]Academia Sinica
          [47 ]Taiwan Environmental Information Association
          [48 ]Department of Biological Sciences, Clemson University
          [49 ]King Abdullah University of Science and Technology
          [50 ]American Samoa Coral Reef Advisory Group- Department of Marine and Wildlife Resources
          [51 ]Wolfson College
          [52 ]Coral Cay Conservation
          [53 ]Fisheries Research, Department of Primary Industries, PO Box 4291
          [54 ]Hawaii Pacific University
          [55 ]Hawaii Institute of Marine Biology, University of Hawaii
          [56 ]Healthy Reefs for Healthy People Initiative
          [57 ]Center for Marine Biodiversity and Conservation, Scripps Institution of Oceanography, University of California San Diego
          [58 ]Universidade Federal do Sul da Bahia
          [59 ]School of Natural and Environmental Sciences, Newcastle University
          [60 ]Center for Marine and Environmental Studies, University of the Virgin Islands
          [61 ]NOAA NMFS Protected Species
          [62 ]Centro Ecológico Akumal
          [63 ]Rosenstiel School of Marine and Atmospheric Sciences, University of Miami
          [64 ]Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology
          [65 ]Save Our Seas Foundation - D’Arros Research Centre
          [66 ]Ginger-Soproner
          [67 ]Pacific Community (SPC)
          [68 ]Finger Lakes Community College
          [69 ]Western Australian Museum
          [70 ]Bureau of Statistics and Plans
          [71 ]Johnston Applied Marine Sciences
          [72 ]NOAA Flower Garden Banks National Marine Sanctuary
          [73 ]the University of Tokyo
          [74 ]Federal University of Bahia, RECOR - Coral Reefs and Global Change Lab, National Institute of Science and Technology for the Tropical Marine Environments (INCT AmbTropic
          [75 ]Chumbe Island Coral Park
          [76 ]Fishery Solutions LLC
          [77 ]State of Hawai'i Division of Aquatic Resources
          [78 ]Atlantic and Gulf Rapid Reef Assessment (AGRRA)
          [79 ]Blue Ventures
          [80 ]Department of Oceanography - Federal University of Bahia, RECOR - Coral Reefs and Global Change Lab, National Institute of Science and Technology for the Tropical Marine Environments (INCT AmbTropic
          [81 ]Faculty of Science and Marine Environment, Universiti Malaysia Terengganu
          [82 ]Department of Biology, Florida International University
          [83 ]Rosenstiel School of Marine and Atmospheric Science, University of Miami
          [84 ]Marine Ecology Laboratory, Department of Oceanography and Limnology Universidade Federal do Rio Grande do Norte
          [85 ]CalAcademy
          [86 ]Talanoa Consulting
          [87 ]Lúrio University
          [88 ]Marine Conservation Society Seychelles
          [89 ]Biscayne National Park
          [90 ]Smithsonian Institution
          [91 ]Marine Ecology Laboratory, Dept of Oceanography and Limnology, Univ. Federal do Rio Grande do Norte
          [92 ]Reef Conservation
          [93 ]Green Corals
          [94 ]Marine Genomics Laboratory, Department of Life Sciences, Texas A&M University Corpus Christi
          [95 ]DiSTAV, University of Genova
          [96 ]Zoological Survey of India, Marine Biology Regional Center
          [97 ]Islamic Azad University
          [98 ]Instituto de Biologia and SAGE/COPPE, Universidade Federal do Rio de Janeiro
          [99 ]Department of Zoology, Faculty of Science, University of Peradeniya
          [100 ]Faculty of Science, University of the Ryukyus
          [101 ]MAREX
          [102 ]NOAA, Texas Flower Garden Banks National Marine Sanctuary / CPC Inc.
          [103 ]CERMES, University of the West Indies
          [104 ]Wildlife Conservation Society-India
          [105 ]Division of Coastal Resources Management, Bureau of Environmental and Coastal Quality
          [106 ]Blue Resources Trust
          [107 ]Reef Check Indonesia Foundation
          [108 ]Coastal and Marine Programs, Dial Cordy and Associates, Inc.
          [109 ]Suganthi Devadason Marine Research Institute
          [110 ]University of Ryukyus
          [111 ]School of Ocean Sciences, Bangor University
          [112 ]Boston University
          [113 ]Australian Institute of Marine Science, Indian Ocean Marine Research Centre
          [114 ]The Nature Conservancy Micronesia Marine Program
          [115 ]Scripps Institution of Oceanography, University of California San Diego
          [116 ]Faculty of Life Sciences and Biotechnology, Shahid Beheshti University
          [117 ]Scripps Institution of Oceanography University of California San Diego
          [118 ]Bermuda Aquarium, Museum and Zoo
          [119 ]University of the Virgin Islands
          [120 ]School of Life Sciences, Faculty of Science, University of Technology Sydney
          [121 ]Marine Ecology Consulting
          [122 ]University of Hawaii Sea Grant College Program
          [123 ]Fauna & Flora International
          [124 ]Institute of Oceanography, Vietnam Academy of Science and Technology
          [125 ]Tropical Marine Science Institute, National University of Singapore
          [126 ]MISE Lab, The University of Queensland
          [127 ]State University of Zanzibar
          [128 ]marinecultures.org
          [129 ]Carmabi Foundation/ University of Amsterdam
          [130 ]Nha Trang Institute of Oceanography, Vietnam Academy of Sciences
          [131 ]University of Konstanz
          [132 ]Universiti Kebangsaan Malaysia
          [133 ]Institute of Marine Sciences, University of Dar es Salaam
          [134 ]Marine Biodiversity Research Group, Department of Biology, Faculty of Science, Ramkhamhaeng University
          [135 ]Justus Liebig University Giessen
          [136 ]Palau International Coral Reef Center
          [137 ]Atlantic Oceanographic and Meteorological Laboratory, NOAA
          Article
          10.21203/rs.3.rs-1555992/v1
          81cd1145-5669-4a47-8cfa-055e916f52d1
          © 2022

          https://creativecommons.org/licenses/by/4.0/

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