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IMR. Distribution and Migration of cod, the impact of climate Geir Ottersen Institute of Marine Research, Bergen, Norway and Douglas P. Swain Department of Fisheries and Oceans, Gulf Fisheries Centre, Moncton, N.B., Canada. IMR.

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  1. IMR Distribution and Migration of cod, the impact of climateGeir OttersenInstitute of Marine Research, Bergen, Norway andDouglas P. SwainDepartment of Fisheries and Oceans, Gulf Fisheries Centre, Moncton, N.B., Canada

  2. IMR Highlights from the Distribution and migration chapter of a book on ICES/GLOBEC Cod and Climate Change WG science: ”Cod in a changing climate – effects of physical variability on a key predator in North Atlantic marine ecosystems”edited by K. Drinkwater and K. Brander I will present examples from different stocks on Habitat associations Seasonal migrations Geographic range and its variation

  3. Distribution of Atlantic cod and sea temperatures at 100m depth Atlantic cod Russia Greenland Norway Canada UK Spain Sundby (2000)

  4. IMR Habitat associations • Temperature preferences • Depth preferences • Ontogenetic variation • Interannual variation • Seasonal variation

  5. Seasonal variations in temperature distribution of codGeorges Bank, W and E Scotian Shelf, S. Gulf St. Lawrence

  6. Seasonal variations in depth distribution of codGeorges Bank, W and E Scotian Shelf, S. Gulf of St. Lawrence

  7. 7 6 6 5 4 5 3 2 4 K 1 Ambient temperature 3 2 1 0 1995 1988 1989 1990 1991 1992 1993 1994 Interannual and ontogenetic variability in temperature distribution of codMean ambient winter temperature Arcto-norwegian cod age 1-7

  8. Seasonal variation in ambient temperature of Arcto-norwegian cod K. Michalsen, IMR

  9. IMR Seasonal migrationsbetween spawning grounds, nursery areas and adult feeding grounds Seasonal migration patterns of two large, highly migratory northern stocks: - Southern Gulf of St. Lawrence - Arcto-norwegian (Barents Sea)

  10. Southern Gulf of St. Lawrence cod: Seasonal migrations and spawning grounds

  11. Arcto-norwegian cod: Seasonal migrations and spawning grounds

  12. IMR Geographic range and its variation - Interannual and ontogenetic changes in geographic range - Density-dependent changes in geographic range

  13. 1900 Cape Farewell & Fiskenes Bank 1917-18 Fredrikshaab 1919 Godhaab 1922 Sukkertoppen 1927-30 Christianshaab 1931-36 Umanak Late 1930’s Upernavik Spread of Cod at West Greenland Late 1960 decline and retreat Modified from Keith Brander, ICES

  14. 50 50 40 40 Geographic Range 30 30 20 20 0 20 40 60 80 100 1970 1975 1980 1985 1990 1995 2000 Year Abundance (millions) Density-dependent changes in geographic distribution for Southern Gulf of St. Lawrence cod

  15. Geographic distribution in Septemberof 5-yr old Southern Gulf of St. Lawrence cod during periods of low abundance (1973-1975, 1993-1995), high abundance (1980-1982) and recent (2001).

  16. Example of change in geographic range Relative distribution and abundance of cod in NW Atlantic 1979-2002 derived from NEFSC Spring bottom trawl surveys. Short animation Yellow circles: Cod presentLarger circles: More cod+: Stations without cod Thanks to Mike Fogarty for use of the maps

  17. IMR Thanks for your attention! Geir Ottersen

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