Melting sea ice would increase fisheries near the poles whilst stratification of warmer waters in the tropics would reduce mixing of nutrients and lead to lower production, he said.
The majority of past research has been focused around this main idea of quicker melting sea ice leading to lower ringed seal populations from lack of breeding areas.
Over-fishing, melting sea ice and pollution are threatening these iconic creatures which have so far managed to thrive in the world's harshest conditions.
A photographer captured the incredible sight of a herd of thousands of walruses crowded together on a beach as melting sea ice forced the animals ashore.