Evidence points to a large, rapid northward shift of Pacific cod during recent climate changes

摘要

New genetic research suggests that unprecedented summer abundances of Pacific cod in the northern Bering Sea were due to escalating movement from their core habitat under recentwarm conditions.Until recently, Pacific cod were rarely encountered in the northern Bering Sea. Fishery surveys in the 1970s reported "traceamounts of cod there. A 2010 Alaska Fisheries Science Center survey estimated that the entire northern population amounted to about 3 percent of the large southeastern Bering Sea stock that supported a valuable commercial fishery.