Although projections預測 of global temperature rises show relatively相對 small changes at the bottom of the oceans, the resulting impacts on fish body size are "unexpectedly large", according to this research. As ocean temperatures increase, so do the body temperatures and metabolic rates代謝率 of the fish. This means they use more oxygen氧 to stay alive and, according to the researchers, they have less available for growth發育.
They've calculated that up to 2050, fish will shrink收縮 in size by between 14 and 24 percent, with the Indian and Atlantic Oceans worst affected. The warming waters are also likely to drive fish more towards the poles極, leading to smaller species living in areas like the North Sea.
According to the scientists, their models may underestimate低估 the potential impacts. When they looked at case studies involving涉及 North Atlantic cod鱈魚 and haddock黑線鱈, they found that recorded data on these fish showed greater decreases in actual body size than the models predicted.
They've calculated that up to 2050, fish will shrink收縮 in size by between 14 and 24 percent, with the Indian and Atlantic Oceans worst affected. The warming waters are also likely to drive fish more towards the poles極, leading to smaller species living in areas like the North Sea.
According to the scientists, their models may underestimate低估 the potential impacts. When they looked at case studies involving涉及 North Atlantic cod鱈魚 and haddock黑線鱈, they found that recorded data on these fish showed greater decreases in actual body size than the models predicted.
http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/10/121002_witn_shrinking_fish.shtml
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