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Fish living near the equator will not thrive in the warmer oceans of the future
Date:2/11/2014

According to an international team of researchers, the rapid pace of climate change is threatening the future presence of fish near the equator.

"Our studies found that one species of fish could not even survive in water just three degrees Celsius warmer than what it lives in now," says the lead author of the study, Dr Jodie Rummer from the ARC Centre of Excellence for Coral Reef Studies (Coral CoE) at James Cook University.

Dr Rummer and her colleagues studied six common species of fish living on coral reefs near the equator. She says many species in this region only experience a very narrow range of temperatures over their entire lives, and so are likely adapted to perform best at those temperatures.

This means climate change places equatorial marine species most at risk, as oceans are projected to warm by two to three degrees Celsius by the end of this century.

"Such an increase in warming leads to a loss of performance," Dr Rummer explains. "Already, we found four species of fish are living at or above the temperatures at which they function best."

The team measured the rates at which fish use oxygen, the fuel for metabolism, across different temperatures - at rest and during maximal performance. According to the results, at warmer temperatures fish lose scope for performance. In the wild, this would limit activities crucial to survival, such as evading predators, finding food, and generating sufficient energy to breed.

Because many of the Earth's equatorial populations are now living close to their thermal limits, there are dire consequences ahead if these fish cannot adapt to the pace at which oceans are warming.

Dr Rummer suggests there will be declines in fish populations as species may move away from the equator to find refuge in areas with more forgiving temperatures.

"This will have a substantial impact on the human societies that depend on these fish," she says.

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Contact: Jodie Rummer
jodie.rummer@jcu.edu.au
61-074-781-5300
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

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