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Once inhabited sea star disappears due to hot water and disease – Trail Daily Times



Warm water and infectious diseases have been identified as causes of extinction of sunflower starfish along the Pacific coast, says a recent study.

Sunflower sea stars are among the largest stars in the world and come in different light colors, including purple and orange. Some of them grow to more than one meter and are so fast that "literally cross the sea landscape," says Joseph Gaydos, senior author of the study.

"But when that illness happens, it's like a zombie-apocalypse," said Gaydos, who is from the SeaDoc Society of California University, Davis.

"It can have 24 hands and suddenly walk, and the hands just fall." Then suddenly the whole body just dissolves. "

So what once was a "big, beautiful sea star," rough about five pounds, resembles a pile of calcified parts within a few days, he said.

"It's a really ugly and quick disease for these sunflower sea stars."

In 2013, scientists began to notice that species populations dropped between 80 and 100 percent in deep and shallow waters from Alaska and B.C. in California. Population information was gathered by divers and deep brakes.

Sunflower sea stars are found in waters of hundreds of meters to just three meters.

Diego Montecino-Latorre, co-author of the study, and also from the University of California, Davis, said scientists found a connection between increased water temperature and smaller marine stars.

Gaydos said the water temperature increase was not the same in all areas.

Oceans are not like "dropping" with consistent temperature, he said, adding that in some places in California there was a rise of about 4 ° C, while in Washington, a rise of 2.5 ° C.

One of the theories suggested by scientists is that rising temperatures make sea stars more susceptible to a disease already present, especially because sea stars do not have a complex immune system, he said.

Gaydos said it was extinction calling for awakening.

"It's hard to look after what's going on in the ocean, but we have to pay attention because it happened in a very short time," he said. "That the whole species is almost gone, that's not good."

Hina Alam, Canadian Press

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