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Calculating carbon biomass of Phaeocystis sp. from microscopic observations

Calculating carbon biomass of Phaeocystis sp. from microscopic observations 227 107 107 2 2 V. Rousseau S. Mathot C. Lancelot Groupe de Microbiologie des Milieux Aquatiques Campus de la Plaine Boulevard du Triomphe CP 221 B-1050 Bruxelles Belgium 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 of Phaeocystis sp. colonies therefore greatly varies with their size, ranging from 0.3 to 1430 ngC colony −1 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Calculating carbon biomass of Phaeocystis sp. from microscopic observations

Rousseau, V.; Mathot, S.; Lancelot, C.
Marine Biology , Volume 107 (2) – Jun 1, 1990
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References (30)

Publisher
Springer Journals
Copyright
Copyright © 1990 by Springer-Verlag
Subject
Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/BF01319830
Publisher site
See Article on Publisher Site

Abstract

227 107 107 2 2 V. Rousseau S. Mathot C. Lancelot Groupe de Microbiologie des Milieux Aquatiques Campus de la Plaine Boulevard du Triomphe CP 221 B-1050 Bruxelles Belgium 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 of Phaeocystis sp. colonies therefore greatly varies with their size, ranging from 0.3 to 1430 ngC colony −1 .

Journal

Marine Biology – Springer Journals

Published: Jun 1, 1990

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