Second, the Aphanizomenon
species which appeared has rarely been mentioned and has certainly not been
implicated in such a well-defined bloom event. Third, the more or less homogeneous
vertical distribution of A.ovalisporum during the bloom was different to
the usual surface-concentrated distributions characteristic of Aphanizomenon
flos-aquae blooms elsewhere. Filaments from the lake showed little tendency to
clump together, but in most laboratory cultures A.ovalisporum did tend to aggregate
at the surface of the culture flasks (O.Hadas, unpublished data).