ISSN:
1573-5117
Keywords:
cyanobacteria
;
Microcystissp.
;
Aphanizomenon sp.
;
microcystin
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Since 1996 we have studied the occurrence of cyanobacterial hepatotoxins, microcystins (Mcyst), in the shallow lake Müggelsee. Intracellular (cell-bound) Mcyst's were detectable from late summer to autumn in 2 years, and maximum concentrations of about 3 μg/l of total cell-bound Mcyst were measured. The concentration of Mcyst's was correlated to the biovolume of Microcystissp. (R 2=0.560 in 1996 and R 2=0.483 in 1997; P 〈 0.001). Between years, the ratio of Mcyst'ss per biovolume of Microcystisdiffered significantly (P 〈 0,001; 0.913 μg/mm3in 1996 and 0.171 μg/mm3in 1997). The ratio of the detected Mcyst variants, Mcyst-LR and Mcyst-RR, was constant in all samples with Mcyst-LR:Mcyst-RR≈1:2.9. One out of 22 strains of Microcystissp. we isolated in 1997 contained Mcyst-LR and Mcyst-RR at a ratio of Mcyst-LR:Mcyst-RR=1:1.6. The Mcyst'ss found in lake samples were likely to have been produced by a number of a few strains that were present in the lake for extended periods of time in both years.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1017040126508
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