Marine life in tropical waters declines when average annual sea temperatures rise above 20-25
Global warming has been changing ocean life for at least 60 years.
Mark Costello, Professor of Marine Biology, University of Auckland
The authors of the work note that the number is about 1500 species of marine animals declined near the equator. Poleward migration was more pronounced north of the equator, where the oceans warmed faster than in the southern hemisphere.
Fossils show that the same thing happened 140,000 years ago, when global surface temperatures were last as hot as they are today.
According to a recent article in the journal Nature, the maximum catching potential for tropical fish 370 km offshore will decline by 40% by mid-century unless global warming stops.
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