A New Hope For Bleached Coral Reefs?

UN report finds parts of coral reef ecosystems may survive in barely known deeper environments

Acknowledging the fact that the most noble and effective remedy for the Earth’s oceans and ecosystems (i.e., eradicating the bloody humans) is unlikely to happen voluntarily, maybe we can do something to amend the damage we’ve caused.

In the case of re-establishing a vibrant and healthy Great Barrier Reef, please, please let this one work.


A report commissioned by the United Nations and co-authored by the University of Sydney’s UNESCO Chair in Marine Science offers a glimmer of hope to those managing the impact of bleaching on the world’s coral reefs, including the Great Barrier Reef.

Coral bleaching has affected virtually the entire Great Barrier Reef and many other coral reef systems globally, a result of the continuing rise in global temperatures and exacerbated by the summer’s major El Niño event.

The 35 authors of the United Nations Environmental Programme report – including the University’s Professor Elaine Baker in the School of Geosciences – say as the world’s surface reefs are being threatened, part of the ecosystem may survive in these barely known deeper environments, known as mesophotic coral ecosystems (MCEs, pictured right).

Shallow coral reefs from the water’s surface to 30-40 metres depth are the tip of the iceberg that comprises the ocean’s extensive coral ecosystem. MCEs are intermediate depth reefs starting at about 40 metres depth and continuing to around 150 metres. The report being launched today – ‘Mesophotic Coral Ecosystems A lifeboat for coral reefs?’ – looks at the role MCEs could play in the preservation of shallower reefs.

The report asks if MCEs can provide a refuge for the species under threat in shallower reef ecosystems and whether they can provide the stock to re-populate shallow reefs if they continue to decline.

“Mesophotic coral ecosystems are a seed bank for some organisms,” said Professor Baker.

“More research needs to be done to firmly establish the rMesophotic Coral Ecosystem by NOAA's Hawai'i Undersea Research Laboratory, deeper, not bleached coral reefsole of MCEs in preserving our reefs; they aren’t a silver bullet but they may be able to resist the most immediate impacts of climate change — thereby providing a refuge for some species and potentially helping to replenish destroyed surface reef and fish populations.

“It may be that the cooler, deeper water in MCEs could be more hospitable to many species than the warmer surface water,” she said. “They also are less prone to waves and turbulence, therefore potentially offering a more stable environment.”

The review brought together information on the geology, biology, distribution and socio-economic aspects of mesophotic reefs in order to examine their potential resilience.

The report found some deep mesophotic coral ecosystems may be less vulnerable to the most extreme ocean warming, but others may be just as vulnerable as their shallow counterparts and cannot be relied on to act as “life boats”.

Source: Eurekalert/University of Sydney
Photo: NOAA’s Hawai’i Undersea Research Laboratory

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