Far from bleached, reef’s in the pink

West Australian coral is doing fine while Queensland (Eastern) coral is extensively bleached.  So any pretense that the Queensland situation is part of a global phenomenon is at least dubious.  There's some very confused thinking about El Nino and La Nina below.  The journalist appears to have the two mixed up

Scientists have discovered that the World Heritage-listed Ningaloo Reef off the West Australian coast — the largest fringing reef in Australia — has escaped any recent coral bleaching and that some areas are in the same condition as 30 years ago.

CSIRO ecologist Damian Thomson said yesterday a major study of the reef that ended this month had found that Ningaloo was unaffected by the current bleaching "event" that has hit Queensland’s Great Barrier Reef and other reefs off WA’s northern coast.

He said the research — funded by CSIRO and BHP Billiton through a $5.4 million partnership — showed Ningaloo was more resilient than expected.

"It’s really pleasing that Ningaloo hasn’t undergone any bleaching — it’s fantastic news actually," Mr Thompson said.

The clean bill of health will be welcomed by the tourism industry around Exmouth, a town ­reliant on thousands of visitors visiting the reef every year ­between April and July to snorkel with migrating whale sharks. Later this year, tourists will also be able to swim with humpback whales, which is expected to double the length of Exmouth’s $6m tourist season.

Conservationists are worried about the human impact on the reef and have also raised concerns in recent years about ­increased oil and gas exploration — including by BHP — close to Ningaloo Marine Park.

Mr Thomson said while coral bleaching remained a possible future threat to the reef, the sheer number of people visiting the area was its major challenge.

"It’s a relatively small tract of reef when you look at the extent of the Australian coastline, but the number of people that love holidaying there or going there for other activities, it is very well used. That is probably the main challenge, managing that."

Mr Thomson said bleaching tended to occur on Australia’s west coast during La Nina years, when strong currents from ­Indonesia pushed warm water south to Ningaloo. But during the recent El Nino, those strong currents had not ­occurred, ­resulting in cooler waters.

CSIRO research surveyed 70 sites at Ningaloo and found no coral bleached at locations where bleaching was recorded in 2010. At Osprey, on the western part of Ningaloo, results were as good as those taken in 1987. Ningaloo was declared a UNESCO World Heritage site in 2011 for its biological diversity and conservation significance.

The findings are for the first year of field work undertaken by the Ningaloo Outlook project, which aims to increase the ­ecological understanding of the reefs.

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