Isozyme analysis of isolates of Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle revealed nine putative loci. Six of the nine loci were polymorphic, showing variation among isolates of this species from the same locality. Several clones of P. pseudodelicatissima were found in Danish waters, and an extensive bloom of the species in 1992 in Danish and Swedish coastal waters was apparently polyclonal. None of the isolates was found to produce domoic acid.
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Skov et al. (1997) studied this question.
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