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Preferred temperature of juvenile Atlantic cod Gadus morhua with different haemoglobin genotypes at normoxia and moderate hypoxia

Maria Faldborg Petersen^* and John Fleng Steffensen

Marine Biological Laboratory, University of Copenhagen, Strandpromenaden 5, DK-3000 Helsingør, Denmark

View larger version (17K): [in a new window]   Fig. 1. Oxygen saturation, swimming speed and water temperature measured for cod with haemoglobin type HbI-1 and HbI-2. When the oxygen saturation is lowered to 35% the preferred temperature of HbI-1 cod decreases, while this tendency is absent for HbI-2 cod. For both the haemoglobin types the swimming speed decreases during hypoxia. Measurements were made every second and each point is a mean value calculated for 1 h.

View larger version (53K): [in a new window]   Fig. 2. Sea surface temperatures (spring) and the frequency distribution of the HbI1 allele throughout the range of the Atlantic cod (Sick, 1965a,b; Frydenberg et al., 1965). The frequency of the HbI1 allele is low in cold water regions and become more dominant in warmer areas. A clear cline is found along the Norwegian coast.