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The comparative growth of some algal populations and their associated bacteria in laboratory cultures
Prieur, D.; Le Roux, S. (1976). The comparative growth of some algal populations and their associated bacteria in laboratory cultures, in: Persoone, G. et al. (Ed.) Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 1. Research in mariculture at laboratory- and pilot scale. pp. 345-355
In: Persoone, G.; Jaspers, E. (Ed.) (1976). Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 1. Research in mariculture at laboratory- and pilot scale. IZWO: Wetteren. ISBN 90-6281-001-2. 620 pp., more

Available in Authors 
    VLIZ: Proceedings [4823]
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Prieur, D.
  • Le Roux, S.

Abstract
    Four unicellular algal strains (Dunaliella primolecta, Platymonas suecica, Phaeodactylum tricornutum, Skeletonema costatum) were cultured in three volumes (150 ml, 1 I, and 8l). The algae and the bacteria were regularly counted, the former with a particle counter, the latter by the plate count method, using the Oppenheimer and Zobell medium. In all the cultures studied, the algal and bacterial growth progressed in parallel. This was particularly evident for Dunaliella primolecta and Phaeodactylum tricornutum. The bacteria were always more numerous than the algae (from 3-55 times according to the species and the culture volume). The counting of some clearly pigmented colonies did not reveal any clear-cut succession in bacterial populations. Bacteria-free algal strains which were cultured under the same conditions showed the same growth pattern as the non axenic ones; from this it was concluded that the bacteria do not appear to inhibit the algal growth. The parallelism observed between the algal growth and the bacterial growth may be explained, either by a close association between these two populations or by an identical response to a common factor which regulates the growth. From the data obtained, the bacterial contamination which accompanies the feeding of live algae to bivalve larvae was quantified.

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