2016 coral bleaching event

2016 coral bleaching event
Acropora at English Wikipedia · CC BY-SA 3.0 · source
Name	2016 coral bleaching event
Date	2016
Location	Global tropics; notable regions listed below

Contents

2016 coral bleaching event The 2016 coral bleaching event was a global marine disturbance driven by an El Niño–Southern Oscillation anomaly and anthropogenic climate change forcing that produced widespread thermal stress across tropical Pacific Ocean, Indian Ocean, and Atlantic Ocean reef systems. Scientists from institutions such as the National Oceanic and Atmospheric Administration, Australian Institute of Marine Science, Smithsonian Institution, and University of Queensland documented mortality and shifts in reef community composition that affected coral genera like Acropora, Porites, and Montipora and altered ecosystem services relied upon by coastal populations in places including Great Barrier Reef, Hawaii, Maldives, Seychelles, Kiribati, Marshall Islands, and Belize Barrier Reef Reserve System.

Background and causes

The event was precipitated by a strong 2015–16 El Niño event interacting with long-term warming linked to greenhouse gas emissions attributed to industrial activity tracked by agencies such as the Intergovernmental Panel on Climate Change and measured by programs including the Global Climate Observing System and NOAA Coral Reef Watch. Ocean heat content anomalies, recorded by the Argo array and satellite platforms like MODIS and AVHRR, drove prolonged sea surface temperature excursions above historical baselines, stressing symbioses between coral hosts and endosymbiotic dinoflagellates in the family Symbiodiniaceae. Regional exacerbating factors included local stressors documented by researchers from James Cook University, Woods Hole Oceanographic Institution, and University of California, Santa Barbara such as pollution from Deepwater Horizon, sedimentation linked to land-use changes in the Amazon Rainforest and Great Barrier Reef catchments, and outbreaks of coral predators like the crown-of-thorns starfish.

Bleaching affected reef provinces across the Indo-Pacific, Caribbean Sea, and Red Sea. In the Coral Triangle, institutions such as World Wide Fund for Nature and Conservation International reported mass bleaching in nations including Indonesia, Philippines, and Papua New Guinea. The Great Barrier Reef experienced its worst bleaching in recorded history with widespread impacts from northern to central regions documented by the Australian Government and Reef 2050 Plan stakeholders. Pacific island states like Fiji, French Polynesia, and American Samoa reported severe events measured by national agencies such as NOAA Pacific Islands Fisheries Science Center. The Caribbean saw bleaching at sites including Belize Barrier Reef Reserve System, Cayman Islands, and Puerto Rico monitored by Smithsonian Tropical Research Institute and the Gulf and Caribbean Fisheries Institute. The Red Sea and Persian Gulf experienced localized high-thermal-stress bleaching reported by teams from King Abdullah University of Science and Technology and National Center for Marine Conservation partners.

The ecological consequences included high coral mortality, altered benthic composition, and reduced recruitment for reef-building taxa like Acropora palmata and Montastraea cavernosa with cascading effects on reef-associated fauna such as Chaetodontidae butterflyfishes, Pomacentridae damselfishes, and commercially significant Lutjanidae snappers. Mortality changed reef accretion rates measured by coral reef monitoring programs like the Global Coral Reef Monitoring Network and shifted carbonate budgets used by geoscientists at institutions such as Scripps Institution of Oceanography. Secondary effects included algal phase shifts observed in studies by The Nature Conservancy and declines in structural complexity that reduced habitat for species studied by IUCN and Convention on Biological Diversity partners. Disease prevalence increased in bleached populations, linking to pathogens studied by Centers for Disease Control and Prevention collaborators and university groups at University of Miami and University of Hawaiʻi at Mānoa.

Bleaching affected tourism economies in destinations like Great Barrier Reef Marine Park, Maui, Maldives, and Bora Bora impacting operators such as dive companies and fisheries cooperatives recognized by UN Environment Programme and Food and Agriculture Organization. Coastal communities in Southeast Asia, Pacific Islands, and the Caribbean faced losses in food security and livelihoods, prompting responses from development agencies including World Bank, Asian Development Bank, USAID, and Australian Department of Foreign Affairs and Trade. Emergency management and local stakeholder groups such as Local Marine Protected Areas networks, Community Conserved Areas, and NGOs like Oceana and Reef Check mobilized restoration, monitoring, and alternative livelihood programs alongside national ministries such as Department of Environment and Natural Resources (Philippines) and Australian Department of the Environment and Energy.

Scientific responses intensified through coordinated efforts among NOAA Coral Reef Watch, Global Coral Reef Monitoring Network, IUCN specialists, and academic consortia including Australian Research Council centers and the Coral Reef Alliance. Methods included satellite thermal stress mapping, in situ bleaching surveys by teams from University of Exeter and University of Cambridge, experimental trials on assisted evolution led by groups at King Abdullah University of Science and Technology and Stanford University, and propagation techniques advanced by Coral Restoration Foundation and Reef Ball Foundation. Genetic research on symbiont shuffling involved collaborations with Broad Institute and the Max Planck Society, while socioeconomic analysis of adaptation options engaged United Nations Development Programme and International Union for Conservation of Nature expert panels. Citizen science platforms such as Reef Check and iNaturalist enhanced monitoring coverage alongside government-led reef surveys.

The 2016 event influenced international policy dialogues at venues including United Nations Framework Convention on Climate Change, Convention on Biological Diversity, and UNESCO World Heritage Committee deliberations over sites like the Great Barrier Reef. Outcomes included accelerated calls for emissions reductions aligned with Paris Agreement commitments, expanded marine protected areas advocated by The Pew Charitable Trusts and Blue Finance, and revised management plans by national authorities in Australia, United States, France, and Maldives. Conservation strategies emphasized resilience-based management promulgated by IUCN and World Resources Institute, integration of traditional knowledge from indigenous groups such as the Torres Strait Islanders and Native Hawaiian communities, and funding mechanisms involving multilateral lenders like the Green Climate Fund.

Category:Coral reefs Category:Environmental disasters