Chemical composition and alkaline phosphatase activity of nutrient-saturated and P-deficient cells of four marine dinoflagellates

Sakshaug, ETrondhjem Biological Station, University of Trondheim, Trondheim, Norway (författare)

Four marine dinoflagellates, Amphidinium carterae Hulburt, Ceratium tripos (O.F. Müll.) Nitzsch, Prorocentrum minimum (Pav.) J. Schiller, and Scrippsiella trochoidea (Stein) Loeblich III were grown as dilution cultures at 18°C, S = 29%. and 30 μE·m−2·s−1 at L:D = 14:10 h. In nutrient-saturated cultures, the growth rates (doubl·day−1) ranged from 0.38 for Scrippsiella to 0.80 for Prorocentrum, and carbon content (pg·cell−1) from 83 for Amphidinium to 6900 for Ceratium. The atomic N/C ratio was 0.13–0.15, but for Ceratium it was 0.088, because of its thick, cellulose theca. The atomic N/P ratio ranged from 12–13 for Ceratium and Scrippsiella to 15–17 for Prorocentrum and Amphidinium. Under P-deficient conditions (growth rate 39–70% of the maximum), cellular P decreased considerably, but so did N, so that the N/P ratio was only slightly affected. There was a concomitant increase in carbon content per cell of 1.2- to 1.7-fold. Alkaline phosphatase activity was virtually nil in nutrient-saturated cells, but was readily demonstrable in all species when P-deficient.

Graneli, EdnaDepartment of Marine Botany, University of Lund, Lund, Sweden(Swepub:lnu)ngred (författare)
Elbrächter, MBiologische Anstalt Helgoland, Litoralstation List/Sylt, FRG (författare)
Kayser, HBiologische Anstalt Helgoland, Litoralstation List/Sylt, FRG (författare)
Trondhjem Biological Station, University of Trondheim, Trondheim, NorwayDepartment of Marine Botany, University of Lund, Lund, Sweden (creator_code:org_t)

Ingår i:Journal of Experimental Marine Biology and Ecology: Elsevier BV77, s. 241-2540022-09811879-1697

Av författaren/redakt...: Sakshaug, E; Graneli, Edna; Elbrächter, M; Kayser, H

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