Mass coral bleaching on Australia’s Great Barrier Reef could cost the region more than 1 million tourists a year and up to A$1 billion (US$750 million) in lost revenue, a study said yesterday.
Scientists said this week that coral bleached for two consecutive years at the World Heritage-listed site had “zero prospect” of recovery after researchers detected another round of mass bleaching due to warming sea temperatures.
In a new study, Australia’s independent Climate Council said that further damage to the 2,300km-long reef could severely affect tourism and cost abut 10,000 jobs.
Photo: EPA
“This isn’t just an environmental issue. The Great Barrier Reef is one of Australia’s greatest economic assets,” council member and biologist Lesley Hughes said.
“It’s responsible for bringing in more than A$7 billion each year to our economy, while also supporting the livelihoods of around 70,000 people,” she said.
Even if parts of the reef hurt by bleaching bounce back, scientists said it could take up to a decade for even the fastest growing corals to recover.
“If coral bleaching persists, tourism areas adjacent to the Great Barrier Reef risk declines ... from 2.8 million visitors [2015 figures] to around 1.7 million per year,” the study said, citing analysis by the Australia Institute think tank.
“This is the equivalent of more than A$1 billion in tourism expenditure, which supports around 10,000 tourism jobs in regional Queensland,” it said.
The reef is experiencing its fourth mass bleaching — where stressed corals expel the algae that live in their tissue and provide them with food — after previous events in 1998, 2002 and last year.
It is also under pressure from farming run-off, development and the crown-of-thorns starfish.
Last month, the site was hammered by Cyclone Debbie, mostly affecting southern areas around the Whitsunday Islands, which largely escaped the bleaching.
In another setback, scientist Andrew Brooks of Griffith University said that aerial assessments showed flood plumes from two rivers swelled by the cyclone were now pushing sediment and nitrogen pollution into reef waters.
“We know sediment can harm coral and sea grass by restricting light,” he said. “Now we’re learning that sediment from this area also carries large loads of harmful nitrogen because it sticks to the sediment sourced from these same soils.”
WWF-Australia’s Sean Hoobin said: “We need greater investment in catchment repair so that the next cyclone or flood does less harm to the reef.”
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