UBC scientists say climate change has been affecting global fisheries for the past four decades by driving species toward cooler, deeper waters, and the trend is likely to continue. Large numbers of fish will disappear from the tropics by 2050, according to a University of British Columbia (Source: CBS/Luis Galdamez/Reuters)study that examines the potential effects of climate change on marine life.
Researchers used the same climate change scenarios as the UN’s Intergovernmental Panel on Climate Change to project a large-scale movement of marine fish and invertebrates. They concluded that changing temperatures will drive more fish toward Arctic and Antarctic waters.
The UBC team came up with a worst-case scenario, in which the Earth’s oceans warm by three degrees Celsius by 2100. In that case, fish could move away from their current habitats at a rate of 26 kilometres per decade. Under the best-case scenario, where the Earth warms by one degree Celsius, fish would move 15 kilometres every decade.
William Cheung, co-author of the study released Friday, said the tropics would be the “overall losers” because countries in these regions rely heavily on fish for food.
Cheung and his colleague used modelling to predict how 802 commercially important species of fish and invertebrates react to warming water temperatures, other changing ocean properties, and new habitats opening up at the poles.
News Source – Read more at CBC News: http://www.cbc.ca/news/technology/global-warming-to-drive-fish-toward-poles-study-says-1.2795077