Pink salmon - too much of a good thing?

摘要

Of the five species of salmon that swim Alaska waters, the pink is by far the most plentiful. Some scientists think the fish is an overabundant predator that outcompetes other salmon and some seabirds.In the late 1990s, Japanese researchers noticed an intriguing pattern while studying in the Bering Sea just north of the Aleutians. During every odd-numbered year, populations of tiny ocean creatures called copepods were very low. The year after, their numbers were high.