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Dynamics of a Phaeocystis-dominated spring bloom in Belgian coastal waters: 1. Phytoplanktonic activities and related parameters
Lancelot, C.; Mathot, S. (1987). Dynamics of a Phaeocystis-dominated spring bloom in Belgian coastal waters: 1. Phytoplanktonic activities and related parameters. Mar. Ecol. Prog. Ser. 37: 238-248
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 134086 [ OMA ]

Keywords
    Algae; Growth rate; Photosynthesis; Phytoplankton; Algae; Phaeocystis pouchetii (Hariot) Lagerheim, 1896 [WoRMS]; ANE, Belgium [Marine Regions]; Belgium [Marine Regions]; Marine

Authors  Top 
  • Lancelot, C., more
  • Mathot, S.

Abstract
    Phytoplanktonic activities were measured weekly during spring 1984 in Belgian coastal waters almost entirely dominated by Phaeocystis pouchetii colonies. Accurate methods were developed to measure photosynthesis and growth rates by colonial P. pouchetii cells, mucus secretion and excretion from colonies. Photosynthetic properties, although quite different for cellular photosynthesis and mucus secretion, were found to be independent of changes in environmental conditions. Maximal photosynthetic rates were respectively 0.09 and 0.16/h for cells and mucus. Cellular specific growth rate, on the other hand, was inversely correlated to the level of ambient inorganic nitrogen. Extreme values for cell turnover rates were 0.12 and 0.38/d. A budget of metabolic activities of P. pouchetii colonies was established for the period of their bloom. The colonies photo-assimilated 94 g C/m2/mo. From this, a maximum of 84 g C/m2/mo was devoted to colonial biomass production and 7.5 g C/m/mo was excreted from the colonies.

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