ナショナルジオグラフィックのインスタグラム(natgeo) - 3月27日 15時21分

photo by @daviddoubilet A DeHavilland Beaver floatplane carrying snorkelers flies along the channel separating Hook and Hardy reefs on Australia's Great Barrier Reef. The Great Barrier Reef is the worlds largest and most iconic coral reef system in the world and currently experiencing a 2017 coral bleaching event. High water temperatures cause the coral polyps to lose their symbiotic algae. The algae provides the coral valuable nutrients and gives coral its beautiful color. Bleached corals may recover if temperatures drop or they may die and become algae covered deadzones. Last year (2016) 90% of the 1200 mile long reef system experienced an unprecedented coral bleach event. The extent of the 2017 bleach event is yet to be determined. Shot on assignment for @ナショナルジオグラフィック with @natgeocreative @thephotosociety #ocean #coralbleaching #australia #coralreef #climatechange #moreocean to for more #greatbarrierreef see @daviddoubilet

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