Great Barrier Reef bleaching occurred on over 90 per cent of reefs this summer, report reveals

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More than 90 per cent of coral reefs surveyed on the Great Barrier Reef suffered some form of bleaching this summer, according to a new report.

The Great Barrier Reef Marine Park Authority annual snapshot details how the 2021-22 summer led to a mass bleaching event of coral.

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It is the fourth mass bleaching event in seven years on the reef and the first to occur under La Niña conditions.

The report says a total of 719 reefs between the Torres Strait and the Capricorn Bunker Group, east of Gladstone, in the Great Barrier Reef Marine Park, were surveyed from the air.

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Ninety-one per cent of the reefs exhibited some bleaching.

Great barrier reef bleaching occurred on over 90 per cent of reefs this summer, report reveals

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2022 Aerial Survey observations of reef community coral bleaching throughout the Great Barrier Reef after the final heat wave from 12-23 March 2022.(Great Barrier Reef Marine Park Authority)

Great Barrier Reef Marine Park Authority chief scientist David Wachenfeld said the good news is that early signs suggest a low mortality rate.

Dr Wachenfeld said the 2016/17 bleaching event had a high mortality rate, while the bleaching that occurred in 2020 did not kill as much coral.

“The early indications are the mortality won't be very high so we are hoping that we will see most of the coral that is bleached recover, and we will end up with an event rather more like 2020 where yes there was mass bleaching but there was low mortality.”

Survey results 'devastating'

The report said bleaching was mostly seen in the northern and central regions of the reef and was more variable in the southern region reflecting the boundary of lower heat stress exposure.

The Australian Marine Conservation Society's Lissa Schindler said the annual snapshot report was “devastating” news.

“This was a La Niña year, normally characterised by more cloud cover and rain. It should have been a welcome reprieve for our reef to help it recover,” she said.

She called for both major parties to increase their 2030 emissions reductions targets in response to this latest mass bleaching event.

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