Image 1 of 1
pk global warming 06.jpg
A Cormorant flys over the Morro Bay Estuary, California December 7, 2005. Scientists say a dramatic rise in the ocean temperature led to unprecedented deaths of birds and fish this summer all along the coast from central California to British Columbia in Canada. The population of seabirds, such as Brant Geese, Cormorants, Auklets and Murres, and fish, including salmon and rockfish, fell to record lows. This ecological meltdown mirrors a similar development taking place thousands of miles away in the North Sea. Also caused by warming of the water, the increase in temperatures there has driven the plankton that form the base of the marine food chain hundreds of miles north, triggering a collapse in the number of sand eels on which many birds and large fish feed and causing a rapid decline in puffins, razorbills, kittiwakes and other birds. The collapses in the Pacific are also down to the disappearance of plankton, though the immediate cause for this is different. Normally, winds blow south along the coast in spring and summer, pushing warmer surface waters away from the shore and allowing colder water that is rich in nutrients to well up from the sea bottom, feeding the microscopic plants called phytoplankton. These are eaten by zooplankton, tiny animals that in turn feed fish, seabirds and marine mammals. CORBIS/Phil Klein..