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Distribution and Migration of cod, the impact of climate Geir Ottersen Institute of Marine Research,

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Distribution and Migration of cod, the impact of climate ... Highlights from the Distribution and migration ... Georges Bank, W and E Scotian Shelf, S. Gulf ... – PowerPoint PPT presentation

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Title: Distribution and Migration of cod, the impact of climate Geir Ottersen Institute of Marine Research,


1
Distribution and Migration of cod, the impact of
climateGeir OttersenInstitute of Marine
Research, Bergen, Norway and Douglas P.
SwainDepartment of Fisheries and Oceans, Gulf
Fisheries Centre, Moncton, N.B., Canada
2
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
ecosystemsedited 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
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
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
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
Geographic range and its variation
- Interannual and ontogenetic changes in
geographic range - Density-dependent changes in
geographic range
13
Spread of Cod at West Greenland
Late 1960 decline and retreat
Modified from Keith Brander, ICES
14
Density-dependent changes in geographic
distribution for Southern Gulf of St. Lawrence cod
15
Geographic distribution in September of 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
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Thanks for your attention!
Geir Ottersen
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