Marine heatwaves have caused coral bleaching in one of the most isolated ecosystems in the world.
This month corals in Lord Howe Island Marine Park began showing signs of bleaching. The 145,000-hectare marine park contains the most southerly coral reef in the world, in one of the most isolated ecosystems on the planet.
Bleaching is unevenLord Howe Island was named a UNESCO World Heritage site in 1982. It is the coral reef closest to a pole, and contains many species found nowhere else in the world. One surveyed reef location in Lord Howe Island Marine Park is severely impacted, with more than 90 percent of corals bleached; at the next most affected reef site roughly 50 percent of corals are bleached, and the remaining sites are less than 30 percent bleached. At least three sites have less than 5 percent bleached corals.
Sustained heat stressed the Lord Howe Island reefs, and put them at risk. They had a temporary reprieve with cooler temperatures in late February, but by March another increase put the ocean temperature well above safe levels. This is now the third recorded bleaching event to have occurred on this remote reef system.
The authors thank ProDive Lord Howe Island and Lord Howe Island Environmental Tours for assistance during fieldwork.
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