Community reorganization in the Gulf of Alaska following ocean climate regime shift

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 composi- tion on long-term (1953-1997) 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 piscivorus sea birds and marine mammals.

[1]  D. Cayan,et al.  Climate-Ocean Variability and Ecosystem Response in the Northeast Pacific , 1998, Science.

[2]  J. Simon,et al.  Recent excursions of capelin (Mallotus villosus) to the Scotian Shelf and Flemish Cap during anomalous hydrographic conditions , 1996 .

[3]  Brad deYoung,et al.  On Recruitment and Distribution of Atlantic Cod (Gadus morhua) off Newfoundland , 1993 .

[4]  P. Sullivan,et al.  Decadal changes in growth and recruitment of Pacific halibut (Hippoglossus stenolepis) , 1999 .

[5]  Steven R. Hare,et al.  Decadal-scale regime shifts in the large marine ecosystems of the North-east Pacific: a case for historical science , 1994 .

[6]  P. J. Anderson,et al.  Response of common murres to the Exxon Valdez Oil Spill and long-term changes in the Gulf of Alaska marine ecosystem , 1996 .

[7]  R. Brodeur,et al.  Long-term variability in zooplankton biomass in the subarctic Pacific Ocean , 1992 .

[8]  P. Livingston.  Importance of predation by groundfish, marine mammals and birds on walleye pollock Theragra chaicogramma and Pacific herring Clupea pallasi in the eastern Bering Sea , 1993 .

[9]  R. Merrick,et al.  Diet diversity of Steller sea lions (Eumetopias jubatus) and their population decline in Alaska: a potential relationship , 1997 .

[10]  A. Hollowed,et al.  Including predation mortality in stock assessments: a case study for Gulf of Alaska walleye pollock , 2000 .

[11]  J. Steele.  Marine Functional DiversityOcean and land ecosystems may have different time scales for their responses to change , 1991 .

[12]  D. Mackas,et al.  Interdecadal variation in developmental timing of Neocalanus plumchrus populations at Ocean Station P in the subarctic North Pacific , 1998 .

[13]  G. Mitchum,et al.  Decadal and basin-scale variation in mixed layer depth and the impact on biological production in the Central and North Pacific, 1960-88 , 1995 .

[14]  Steven R. Hare,et al.  Effects of interdecadal climate variability on the oceanic ecosystems of the NE Pacific , 1998 .

[15]  Napp,et al.  Contrasting years of prey levels, feeding conditions and mortality of larval walleye pollock Theragra chalcogramma in the western Gulf of Alaska , 1995 .

[16]  J. Castilla,et al.  The management of fisheries and marine ecosystems , 1997 .

[17]  J. Wallace,et al.  A Pacific Interdecadal Climate Oscillation with Impacts on Salmon Production , 1997 .

[18]  M. Nelson,et al.  Food Habits of the Commercially Important Groundfishes in the Gulf of Alaska in 1990, 1993, and 1996 , 1993 .

[19]  S. A. Pedersen.  Distribution and Lipid Composition of Pandalus Shrimp Larvae in Relation to Hydrography in West Greenland Waters , 1998 .

[20]  N. Aebischer,et al.  Parallel long-term trends across four marine trophic levels and weather , 1990, Nature.

[21]  D. Ware.  A century and a half of change in the climate of the NE Pacific , 1995 .

[22]  J. Piatt,et al.  Proximate Composition and Energy Density of Some North Pacific Forage Fishes , 1997 .