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Nutrient limitation at the ecosystem and the phytoplankton community level in the Laholm Bay, south-east Kattegat
Graneli, E.; Graneli, W.; Rydberg, L. (1986). Nutrient limitation at the ecosystem and the phytoplankton community level in the Laholm Bay, south-east Kattegat, in: Muus, K. (Ed.) Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. Ophelia: International Journal of Marine Biology, 26: pp. 181-194
In: Muus, K. (Ed.) (1986). Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. Ophelia: International Journal of Marine Biology, 26. Ophelia Publications: Helsingør. ISBN 87-981066-4-3. 477 pp., more
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326, more
Peer reviewed article  

Available in Authors 
    VLIZ: Proceedings [16885]
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Graneli, E.
  • Graneli, W.
  • Rydberg, L.

Abstract
    Nutrient enrichment experiments in the laboratory with surface water from the Laholm Bay, indicate that phytoplankton is nitrogen-limited. Phosphate addition to phytoplankton samples rarely caused a biomass increase in agreement with negligible alkaline phosphatase activity. Usually the inorganic-N/P quotient in surface water was also below the Redfield ratio (16:1, by atoms), indicating potential nitrogen limitation. The supply ratio (runoff and deep water) of inorganic nutrients to the surface water of the bay was 23N:1P for March-October and thus indicates a mean shortage of phosphate. During summer when river runoff is small, the low N/P-ratio in the deep water (10:1) which is mixed into surface water suggests nitrogen limitation, in agreement with the enrichment experiments. Benthic denitrification and the low N/P-ratio of zooplankton excretion may make regenerated primary production nitrogen-limited. The recent suggestion by Smith (1984), that marine ecosystems, like lakes, are phosphorus-limited because any nitrogen shortage is alleviated through nitrogen fixation, does not apply to the bay itself, where water exchange is too rapid to allow for an adjustment of the N/P-supply quotient.

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