Perilous Times
Australia: Thousands dead as Mass starvation of dugongs and
turtles hits Great Barrier Reef
A sudden mass starvation of turtles and dugongs, a rare sea
mammal, off the coast of Queensland has prompted warnings of a
long-term natural disaster in the normally sheltered waters just
inshore of Australia's Great Barrier Reef.
The corpses of hundreds of dugongs have been washed up on shore
Photo: ALAMY
By Jonathan Pearlman, Sydney
9:00AM BST 11 Sep 2011
Along hundreds of miles of beaches and on the shore of small
islands, the rotting carcasses of green turtles and dugongs have
are being washed ashore in alarming numbers - victims, scientists
believe, of the after effects of the cyclone and floods that have
afflicted this part of Australia in the past year.
Now naturalists fear that up to 1,500 dugongs – a species of sea
cows – and 6,000 turtles along the Reef are likely to die in the
coming months because their main food source, sea grass, which
grows on the ocean floor, was largely wiped out by the floods and
cyclone.
In some places the plants were ripped from the seabed by currents
created by the storms and in others they were inundated under silt
and soil washed out from the land by the torrential rains.
Beachgoers have reported stumbling across groups of turtles in
shallow waters near Townsville – only to discover they were dead
or dying.
"This is a long-term environmental disaster," said Dr Ellen Ariel,
a turtle expert at James Cook University.
"It is not like an oil spill where you can clean the water and
move on. It is such a large stretch of coastline... We have had
mass strandings of turtles. The turtles are sick and starving and
can't go on any longer. They don't have anywhere to go."
The Great Barrier Reef Marine Park Authority says it expects more
dugongs to die than in any previous event.
Marine experts have expressed growing concerns about the future of
the Reef's dugongs, which are regarded as a vulnerable species.
The herbivorous creatures, related to the Florida manatee and
believed to be the source of the mermaid myth, helped the Great
Barrier Reef gain its listing as a World Heritage area in 1981.
But their number around the southern parts of the Reef, which
attracts the largest number of tourist, has declined by an
estimated 95 per cent over the past 50 years. Some 5,500 live in
the main section of the Reef, and here growing numbers of
carcasses have been washing up on to coastal golf courses and
island beaches.
Clive Last, who works as a groundsman on a privately-owned island
near the town of Gladstone, was making his way back to the
shoreline on his boat last month when he spotted a "black bulge"
on the rocks of a small island, Witt Island. He made his way to
the pontoon and discovered the marooned body of a seven-foot
dugong, with much of its skin peeled away.
"I could see straight away there was something there that
shouldn't be there," he told the Sunday Telegraph.
"I thought, not another one. It was a big grey and white dead
mass, but it was intact. There was no sign of trauma or cuts or
bruising. Something is going wrong. I've lived here for 50 years
but I have never seen deaths in such numbers."
Mark Read, a protected species expert at the Great Barrier Reef
Marine Park Authority, said turtles and dugongs were the
"lawnmowers of the sea" and their losses could have a damaging
impact on the overall marine ecology.
"We are looking at the highest ever record for stranded dugongs
and the same for turtles," he told The Sunday Telegraph.
"Turtles and dugongs play a key role in maintaining healthy
seagrass beds. We have concerns about the likely effect from a
marked decline of turtles and dugongs. We don't know what the
consequences are."
One of the world's experts on dugongs, Prof Helene Marsh, from
James Cook University, said she was concerned about the dugong's
future in the southern section of the Reef. "It is unprecedented
that such a huge area of coast was affected. In this case, because
the floods and cyclone were so huge and the damage so widespread -
and it followed a wet year last year - we are wondering whether
these animals have anywhere else to go."