A shift in ocean climate during the late 1970s triggered a reorganization of community structure in the Gulf of Alaska ecosystem, as evidenced in changing catch composition on long-term (1953 to 1997) small-mesh trawl surveys. Forage species such as pandalid shrimp and capelin declined because of recruitment failure and predation, and populations have not yet recovered. Total trawl catch biomass declined >50% and remained low through the 1980s. In contrast, recruitment of high trophic-level groundfish improved during the 1980s, yielding a >250% increase in catch biomass during the 1990s. This trophic reorganization apparently had negative effects on piscivorous sea birds and marine mammals.
|Publication Subtype||Journal Article|
|Title||Community reorganization in the Gulf of Alaska following ocean climate regime shift|
|Series title||Marine Ecology Progress Series|
|Contributing office(s)||Alaska Biological Science Center|
|Other Geospatial||Gulf of Alaska|
|Google Analytic Metrics||Metrics page|