Global warming is changing the ecosystem of the ocean: species begin to move towards the poles due to rising temperatures.
Marine life in tropical waters diminishes when the average annual sea temperature rises above 20-25 degrees Celsius. Tropical species are likely to follow their thermal habitat as the subtropical waters heat up.
Global warming has been changing life in the ocean for at least 60 years.
Mark Costello, Professor of Marine Biology at the University of Auckland
The authors of the work note that the number of about 1,500 species of marine animals has decreased near the equator. Pole 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.