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Climate change disables coral bleaching protection on the Great Barrier Reef
Ainsworth, T.D.; Heron, S.F.; Ortiz, J.-C.; Mumby, P.J.; Grech, A.; Ogawa, D.; Eakin, C.M.; Leggat, W. (2016). Climate change disables coral bleaching protection on the Great Barrier Reef. Science (Wash.) 352(6283): 338-342. hdl.handle.net/10.1126/science.aac7125
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

Available in  Authors 

Keywords
    Bleaching; Climate change; Corals; Temperature tolerance; ISEW, Great Barrier Reef [Marine Regions]; Marine

Authors  Top 
  • Ainsworth, T.D.
  • Heron, S.F.
  • Ortiz, J.-C.
  • Mumby, P.J.
  • Grech, A.
  • Ogawa, D.
  • Eakin, C.M.
  • Leggat, W.

Abstract
    Coral bleaching events threaten the sustainability of the Great Barrier Reef (GBR). Here we show that bleaching events of the past three decades have been mitigated by induced thermal tolerance of reef-building corals, and this protective mechanism is likely to be lost under near-future climate change scenarios. We show that 75% of past thermal stress events have been characterized by a temperature trajectory that subjects corals to a protective, sub-bleaching stress, before reaching temperatures that cause bleaching. Such conditions confer thermal tolerance, decreasing coral cell mortality and symbiont loss during bleaching by over 50%. We find that near-future increases in local temperature of as little as 0.5°C result in this protective mechanism being lost, which may increase the rate of degradation of the GBR.

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