Business Standard

Crabs helping Great barrier reef to fight deadly disease

Image

Press Trust of India Melbourne

Joseph Pollock, from James Cook University's School of Marine and Tropical Biology and the Australian Institute of Marine Science (AIMS), has been studying the disease, and its unlikely helper, the "furry coral crab".

The study found that Cymo melanodactylus crabs slow progression of white syndrome lesions on corals.

Pollock said another research team at JCU had originally reported on an association between white syndrome and these crabs.

Initially, it was thought the crabs were to blame for the disease, rather than helping cure it, he said.

"Researchers originally speculated that they may actually cause the disease, since diseased colonies have high numbers of crabs and it is known that these crabs can eat coral tissue," he said.

 

"I have been doing a number of assays to determine the cause of this disease and it didn't seem that the crabs could cause the amount of destruction you see with this disease, in which the coral tissue essentially just falls off of the coral skeleton," Pollock said.

"This was the first study to report that they actually slow the disease progression. To my knowledge, this is also the first study to demonstrate that coral-dwelling invertebrates have the potential to slow disease progression on their host," Pollock added.

Pollock said it was not entirely clear how the crabs slowed the disease progression.

"We hypothesise that it may be in a manner similar to maggot debridement therapy, an ancient medical treatment that is actually still in use today," he said in a statement.

"Essentially, the crabs could be slowing the disease by simply feeding on sloughing coral tissue and potentially harmful microbes at the lesion front," he added.

Pollock said he had been studying white syndrome coral disease at Lizard Island, about 240km north of Cairns and 27km off the Far North Queensland coast, for about two years but this set of experiments was quite brief.

"It is also interesting that we found these crabs to be very strongly attracted to white syndrome colonies," Pollock said.

"This means that when a coral is infected with the disease, crabs from nearby coral colonies could migrate to the diseased colony, slowing the disease. This could be a very interesting feedback mechanism whereby these crabs help to slow coral disease on reefs," he added.

  

Don't miss the most important news and views of the day. Get them on our Telegram channel

First Published: Feb 05 2013 | 3:35 PM IST

Explore News