. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 706 BIOLOGY OF THE SEAS OF THE , viridis as cold-water forms, and Planktoniella sol and Vultar sumatranum as warm-water forms, may serve as good indicators of the warm (Kuroshio) and cold (Oyashio) waters of the northwestern part of the Pacific Ocean (G. Semina, 1958). Alterations in the plankton density (Fig 340) and in the indices of its primary production (Fig. 341) are just as characteristic. Off the Kamchatka coast primary production in the autumn of 1955 was 20 times higher than in the
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 706 BIOLOGY OF THE SEAS OF THE , viridis as cold-water forms, and Planktoniella sol and Vultar sumatranum as warm-water forms, may serve as good indicators of the warm (Kuroshio) and cold (Oyashio) waters of the northwestern part of the Pacific Ocean (G. Semina, 1958). Alterations in the plankton density (Fig 340) and in the indices of its primary production (Fig. 341) are just as characteristic. Off the Kamchatka coast primary production in the autumn of 1955 was 20 times higher than in the tropical region. Plankton biomass in the waters adjacent to the Kuril Islands is on the average 200 mg/m3 in autumn. Increasing gradually to the southeast, it becomes more than 500 mg/m3 within the region of greatest 140' 145 160 165°. Fig. 340. Distribution of zooplankton biomass in 0 to 100 m layer of the northwestern Pacific, August to October 1954. 1 Above 500 mg/m3; 2 From 250 to 500 mg/m3; 3 From 100 to 250 mg/m3; 4 Below 100 mg/m3 (Bogorov and Vinogradov). vertical mixing (V. Bogorov and L. Vinogradov, 1955), reaching at times 2,000 to 3,000 mg/m3. Still farther to the southeast the plankton biomass falls to 50 or even 20 mg/m3. However, it has to be taken into account that in the warm tropical waters the number of plankton generations is considerably higher and the period of multiplication much longer, thus compensating for the small indices of isochronous biomass. In the Kuril-Kamchatka region, for instance, Calanus plwnchrus has only two multiplication maxima, the spring and autumn ones, and only two seasonal generations. The dominant forms of the surface euphotic zone (0 to 200 m) in Kuril (boreal) waters have been given above. In May and June 1953 the 0 to 200 m layer contained 31-2 per cent of the total zooplankton biomass of the whole huge water column of the Kuril- Kamchatka trench. The transition zone immediately below it contained. Please note that these imag
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