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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [32967]

Calculating carbon biomass of Phaeocystis sp. from microscopic observations Rousseau, V.; Mathot, S.; Lancelot, C. (1990). Calculating carbon biomass of Phaeocystis sp. from microscopic observations. Mar. Biol. (Berl.) 107(2): 305-314. https://dx.doi.org/10.1007/BF01319830 In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 317663 [ aanvragen ]

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Trefwoorden

Cells Chemical elements > Nonmetals > Carbon Colonies Cultures > Algal culture > Phytoplankton culture Dimensions > Size Population characteristics > Biomass Population functions > Growth Temporal variations > Periodic variations > Seasonal variations Phaeocystis Lagerheim, 1893 [WoRMS] ANE, Noordzee [Marine Regions]; ANE, Noordzee, Zuidelijke Bocht [Marine Regions]

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Auteurs		Top
Rousseau, V., meer Mathot, S. Lancelot, C., meer

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Abstract

Conversion factors for calculating carbon biomass of Phaeocystis sp. colonies and free-living cells were determined from microscopic observations and chemical analysis conducted on cultured and natural Phaeocystis sp. populations originating from the Southern Bight of the North Sea in 1986 and 1987. They allow calculation, in terms of carbon biomass, of the different forms of Phaeocystis sp. that succeed each other when the population is growing, on the basis of microscopic observations. The latter include enumerations of free-living cells (flagellated and non-motile) and colonies, as well as colonial biovolume measurement. Specific application to natural populations from Dutch coastal waters during spring 1986 shows that more than 90% of Phaeocystis sp. carbon biomass is under colonial form, most of it exceeding the grazing characteristics of current zooplankton at this period of the year. Detailed analysis of seasonal changes shows in addition that the size of the colonies greatly increases during the course of Phaeocystis sp. flowering, reaching sizes as high as 1 mm diameter at the top of the bloom when nutrients are depleted. Physiologically this corresponds to an enhanced synthesis of mucilaginous substances, with the decrease of available nutrients leading to an increasing contribution of the matrix to the total colonial carbon during the course of the bloom. Carbon content ofPhaeocystis sp. colonies therefore greatly varies with their size, ranging from 0.3 to 1430 ngC colony -1.

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