New research gives us reason for hope that the Great Barrier Reef is not set up for doom, despite the extensive damage and bleaching of the reef itself.
Scientists at the University of Queensland, the Australian Institute of Marine Science, CSIRO, and the University of Sheffield have recently published a paper with the results of an extensive study in which they found that there are still 100 reefs on the Great Barrier Reef that could help to promote the regional recovery of its ecosystem.
The Great Barrier Reef consists of more than 3,800 individual reefs. These reefs have suffered unprecedented coral bleaching events over the past couple of years. Additionally, the coral-eating crown-of-thorns starfish has also been plaguing the reef system.
The new study shows that there are 100 reefs that fulfill three criteria to promote coral recovery. First, they should lie in cool areas and rarely experience damage from bleaching, thus being able to supply larvae to as many reefs as possible. In addition, reefs should be located in areas of current that can supply coral larvae to as many reefs as possible; and they should not spread the larvae of the crown-of-thorns starfish.
“Finding these 100 reefs is a little like revealing the cardiovascular system of the Great Barrier Reef,” said study author Professor Peter Mumby. “Although the 100 reefs only make up 3 percent of the entire GBR, they have the potential to supply larvae to almost half of the entire ecosystem in a single year.”
“The presence of these well-connected reefs on the Great Barrier Reef means that the whole system of coral reefs possesses a level of resilience that may help it bounce back from disturbances, as the recovery of the damaged locations is supported by the influx of coral larvae from the non-exposed reefs,” said study lead author Dr. Karlo Hock.
Dr. Hock added that this does not mean the Great Barrier Reef corals are safe or in great condition. There is still plenty of reason for concern when it comes to the health of the GBR. “The fact that the study only identified around 100 of these reefs across the entire 2,300-km length of the massive Great Barrier Reef emphasizes the need for both effective local protection of critical locations and reduction of carbon emissions in order to support this majestic ecosystem.”
However, the research also indicates that focusing efforts on these healthy and well-connected reefs, and continual monitoring of those reefs’ health, may be a step toward restoration of the reef. The ecosystem is still vulnerable to the effects of climate change and predation. So, there’s reason for hope, but that optimism must remain guarded until the forces that caused the death of vast swathes of the reef system can be controlled.