Losing Nemo: clownfish 'cannot adapt to climate change'

Clown fish face an uncertain future as they lack the reproductive genetic variation to cope changes in their environment driven
Clown fish face an uncertain future as they lack the reproductive genetic variation to cope changes in their environment driven by climate change

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" , 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 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 .

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


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© 2019 AFP

Citation: Losing Nemo: clownfish 'cannot adapt to climate change' (2019, November 26) retrieved 11 December 2019 from https://phys.org/news/2019-11-nemo-clownfish-climate.html
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