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The Bering Sea Is it just a Warmer Barents Sea?

The Bering Sea Is it just a Warmer Barents Sea?. George L. Hunt, Jr. University of California, Irvine and Bernard Megrey NOAA Alaska Fisheries Science Center. Contents. Physical Comparison Climate and Advective Processes Productivity Biomass Ecosystem Structure. The Bering Sea.

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The Bering Sea Is it just a Warmer Barents Sea?

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  1. The Bering SeaIs it just a Warmer Barents Sea? George L. Hunt, Jr. University of California, Irvine and Bernard Megrey NOAA Alaska Fisheries Science Center

  2. Contents • Physical Comparison • Climate and Advective Processes • Productivity • Biomass • Ecosystem Structure

  3. The Bering Sea P. Stabeno, PMEL

  4. The Barents Sea °C H. Loeng & G. Ottersen

  5. Bering & Barents Seas: Physical Data from: Dommasnes et al., 2001; Sakshaug and Walsh, 2000; Aydin et al., 2002; ACIA, In Press

  6. Lower Trophic Level Productivity Sakshaug & Walsh 2000

  7. Arctic Oscillation and Pacific Decadal Oscillation Indices J. Overland, PMEL

  8. Bering Sea: Decadal-Scale Surface Advection Wilderbuer et al., 2002

  9. Bering Sea Flatfish Recruitment as a Function of Destination of Larval Drift Wilderbuer et al. 2002

  10. North Atlantic Oscillation Index

  11. Year-class Abundance of Cod Abundance Low Medium High Cold years 35% 7% 1% Warm years 31% 14% 12% H. Loeng & G. Ottersen

  12. Bering and Barents Seas- Biomass(tonnes km-2) Blanchard et al., 2002; Aydin et al., 2002

  13. Productivity: Bering & Barents Seas Aydin et al., 2002; Blanchard et al., 2002

  14. Barents Sea: Zooplankton Biomass (g m-2) vs. Capelin Biomass (tonnes) ICES CM 2003/AFCM:22

  15. Barents Sea Model Region Blanchard et al., 2002

  16. SummaryWhy does the Bering have a pollock biomass 30X that of cod in the Barents? • Nutrients & Primary Prod similar • Bering -Diatoms, Barents- Phaeocystis(Sakshaug & Walsh) • Bering & Barents Sensitive to Timing of Bloom • Zooplankton more abundant and productive in Bering

  17. SummaryWhy does the Bering have a pollock biomass 30X that of cod in the Barents? • Pollock eat zooplankton- lower trophic level (3.3 vs 4.3) • Forage fish essential for cod; More (capelin) in Barents; • Pollock cannibalistic- do not need forage fish • Pollock 25X more productive • More seals in Barents Sea

  18. 1st ANNOUNCEMENTInternational GLOBEC Symposium Climate Variability andSub-Arctic Marine EcosystemsVictoria, B.C.CanadaMay 16-20, 2005Co-sponsors:Fisheries and Oceans CanadaNational Science Foundation, U.S.A.North Pacific Marine Science Organization (PICES) North Pacific Research Board

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