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WATER WORLD
Losing Nemo: clownfish 'cannot adapt to climate change'
by Staff Writers
Paris (AFP) Nov 26, 2019

The star of Pixar's blockbuster "Finding Nemo" may be about to vanish again -- this time for good -- as its peculiar mating habits put it at risk from climate change, scientists said on Tuesday.

They observed the vibrantly coloured clownfish -- which live in anemones -- for more than 10 years around Kimbe Island off eastern Papua New Guinea.

A team from France's National Centre for Scientific Research (CNRS) along with other scientists established that the fish were picky about the way they choose their mates.

Given that both anemone and their clownfish tenants ultimately rely for their survival on coral, which is under threat from warming seas and threats such as pollution and human intrusion, they may need to adapt quickly.

The scientists say this can be achieved only with great difficulty.

"The reproductive success of a population is what guarantees (its ability) to adapt," CNRS researcher Benoit Poujol told AFP.

And clownfish have a "very particular" reproductive cycle, dependent on a stable, benign environment.

Each anemone is home to one female fish, a sexually active male and several other males who are not sexually active.

"When the female dies, the male becomes female and the largest of the non-sexually active males became sexually active," Poujol said.

"The clownfish does not have the genetic variation which will allow it to modify its reproduction (method) if there are environmental constraints."

The Intergovernmental Panel on Climate Change last year warned that under 1.5C of warming Earth would lose at least 70 percent of its coral reefs.

Under 2C of warming coral, and the vital ecosystems it supports, would be virtually wiped out.


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WATER WORLD
Rising ocean temps reshaping communities of fish, other marine species
Washington (UPI) Nov 25, 2019
Marine ecosystems are being reshaped by rising ocean water temperatures, according to a new study. For the new research, scientists analyzed millions of records on thousands of species living in 200 different ecological communities. The effort was the largest yet to examine the effects of rising water temperatures on the mix of species living in the ocean. The data showed the mix of fish, crustacean and plankton communities are being dramatically altered, and that these changes are likel ... read more

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