Competitive interaction between Ditylum brightwellii and Skeletonema costatum by toxic metabolites
Rijstenbil, J.W. (1989). Competitive interaction between Ditylum brightwellii and Skeletonema costatum by toxic metabolites. Neth. J. Sea Res. 23(1): 23-27
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
Comparative growth experiments were carried out in order to examine the role of toxic metabolites in the competition between two marine diatom species. Ditylum brightwellii and Skeletonema costatum exhibited mutual inhibition and auto-inhibition. Charcoal filtration did not entirely remove the toxicity. Algal extracts were more toxic than algal filtrates. Cell lysis induced by osmotic-shock treatment caused auto-inhibition in a dense culture of Ditylum brightwellii; cells of this species recovered from a low salinity treatment after addition of charcoal to a culture. In mixed cultures the growth of both species may be affected by mutual inhibition. Toxicity of media depends on the growth phase of the competitors. In dense cultures, comparable with algal blooms in eutrophic waters, exocrines may be more effective than in diluted cultures (cf. mesotrophic waters). Substances excreted in dense blooms of S. costatum may inhibit competing species.
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