281-289, 1992 Bergen. Heyteknologisenteret, - PDF document

281-289, 1992 Bergen. Heyteknologisenteret, Ecol. Prog. floating laboratory 1 m ing water 4 enclosures. The water 10.4, 1.0 nitrate, phosphate silicate, while face water was nutrient or 40 cultures run an average silicate (E2 (El and second day sampling) during period (26 initial silicate supplied with silicate, while with silicate-exhausted water. Thus, in initial silicate Four 12 experiments conducted in 1988. addition (P: nitrate, Si; silicate), global radiation seedling water masses dominating after the experimental period. Names are Enclosure Water Global Dominant 'Flagellates indet. Skeletonerna costatum Chaetoceros sp. Experiments conducted unpubl.). Depth nutrient addition phosphate, N; rate, mean temperature, mean global radiation, dominant species total cell except the conducted in composition in in all nitrate-supply, nitrate Phosphate concentrations were probably not had no values below no values last 5 the enclosures values during 14.6 (E3) Ecol. Prog. Nitrate, inorganic phosphate during the 4 enclosure experiments silicate addition., also received L 8 concentration during enclosure experiments with artificial received some silicate through the water supply) , , , , 2 L 6 8 enclosures without when compared depth supplied this time experiment (Fig. that the species was reported as the upper temperature the temperature range has been use the was never the experiment. flagellates dominated supplied with period (Fig. the highest number was reached d (not maximum concentration the latter species Water from sp. had a concentration Silicate values than 0.6 during the experiment, was observed occurring after d (Fig. became dominant a maximum on Day Water from depth supplied E3 in small unidentified flagellates domi- concentrations of Ecol. Prog. ccncentration, equals growth rate observed a much than the Si fertilization Our experiments, how- ever, can light onto mechanisms the other enclosure experi- gives strong support concern about euthrophication. Parsons a diatom growth leading blooms in dominance may generated under wide range concentration is growth rate diatoms being realized non-limiting silicate Acknowledgements. We from his scient. thesis. earlier versions, drawing the Industrial Research Fisheries Research Council (NFFR). (1991). A nutrient uptake phytoplankton. Mar. L., Magnesen, (1985) Nutrient primary production Norway. Sarsia Gotschalk, C. Deep Sea Dutch coastal Soc. Lond. organic matter land through SCOR Working systems. United Nations, and annual during the Claus, C. (1983).