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The spring phytoplanton bloom in Lindaspollene, a land-locked Norwegian fjord: autotrophic and heterotrophic activities in relation to nutrients Lännergren, C.; Skjoldal, H.-R. (1976). The spring phytoplanton bloom in Lindaspollene, a land-locked Norwegian fjord: autotrophic and heterotrophic activities in relation to nutrients, in: Persoone, G. et al. (Ed.) Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. pp. 363-391 In: Persoone, G.; Jaspers, E. (Ed.) (1976). Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. European Marine Biology Symposia, 10(2). IZWO/Universa Press: Wetteren. ISBN 90-6281-002-0. 712 pp. In: European Marine Biology Symposia.

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Beschikbaar in	Auteurs
VLIZ: Non-open access 330473 [ aanvragen ]
Documenttype: Congresbijdrage

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Marien/Kust

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Auteurs		Top
Lännergren, C. Skjoldal, H.-R.

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Abstract

In 1975 the spring bloom began in early March and culminated around March 24. The bloom was dominated by Skeletonema costatum, which reached a maximum density of 108 cells/l. The bloom was brought to an end due to depletion of silicate. At the culmination the nitrate concentrations were low, and the phosphate remained comparatively high. Near the surface the chlorophyll a content increased from 0.2 to 12.5 mg/m³ and ATP increased from 0.1 to 0.65 mg/m³. The fluctuations of the chlorophyll a: ATP ratio reflected the phytoplankton growth with high values near the culmination of the bloom. The highest rates of autotrophic carbon assimilation were found 1 week before the culmination, whereas the highest rates per chlorophyll a or ATP occurred 1 week earlier. Outside the bloom, assimilation rates and ATP were highly correlated. Heterotrophic glucose assimilation indicated that the microbial activity increased at least 25-fold during the bloom and a period of 2 weeks after the culmination. The number of micro-zooplankton increased about 10-fold and the ash-free dry weight of net-zooplankton about 30-fold. Nutrient regeneration appeared to be of little importance during the bloom, while there was a considerable input of phosphate and silicate from the bottom water.

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