Hepatotoxic cyanobacteria in the shallow lake Müggelsee
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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/1 of total cell-bound Mcyst were measured. The concentration of Mcyst’s was correlated to the biovolume of Microcystis sp. (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 Microcystis differed significantly (P <0,001; 0.913 μg/mm3 in 1996 and 0.171 μg/mm3 in 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 Microcystis sp. 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.
Key wordscyanobacteria Microcystis sp. Aphanizomenon sp. microcystin
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- Chorus, I., 1993. Algal metabolites and water quality: toxins, allergenes, and taste-and-odor-substances. Mem. ital. Idrobiol. 52: 257–280.Google Scholar
- Driescher, E., H. Behrendt, G. Schellenberger & R. Stellmacher, 1993. Lake Müggelsee and its environment — natural conditions and anthropogenic impacts. Int. Revue ges. Hydrobiol. 78: 237343.Google Scholar
- Fastner, J., M. Erhard, W. W. Carmichael, F. Sun, K. L. Rinehart, H. Rönicke & I. Chorus, 1999. Characterization of microcystins in natural blooms and strains of the genera Microcystis and Planktothrix from German freshwaters. Arch. Hydrobiol. 145: 147–163.Google Scholar
- Harada, K., 1996. Chemistry and detection of microcystins. In Watanabe, M. F., K.-I. Harada, W. W. Carmichael & H. Fujiki (eds), Toxic Microcystis. CRC, Boca Raton, U.S.A: 103–148.Google Scholar
- Köhler, J., H. Behrendt & S. Hoeg, Phytoplankton development in the shallow lake Müggelsee and the inflowing Spree during the last two decades (in press).Google Scholar
- Komarek, J. & K. Anagnostidis, 1999. Cyanoprokaryota-1. Teil: Chroococcales. In Ettl, H., G. Gärtner, H. Heynig, D. Mollenhauer (eds), Süßwasserflora von Mitteleuropa. Gustav Fischer, Jena.Google Scholar
- Park, H.-D., C. Iwami, M. F. Watanabe, K.-I. Harada, T. Okino & H. Hayashi, 1998. Temporal variabilities of the concentration of intra-and extracellular microcystin and toxic Microcystis species in a hypertrophic lake, Lake Suwa, Japan (1991–1994). Envir. Toxicol. Water Qual. 13: 61–72.CrossRefGoogle Scholar
- Rapala, J., K. Sivonen, C. Lyra & S.I. Niemelä, 1997. Variation of microcystins, cyanobacterial hepatotoxins, in Anabaena spp. as a function of growth stimuli. Apl. envir. Microbiol. 63: 22062212.Google Scholar
- Watanabe, M., 1996. Isolation, cultivation, and classification of bloom-forming Microcystis in Japan. In Watanabe, M. F., K.-I. Harada, W. W. Carmichael & H. Fujiki (eds), Toxic Microcystis. 2, CRC, Boca Raton, U.S.A: 13–34.Google Scholar
- Watanabe, M. F., 1996. Production of microcystins. In Watanabe, M. F., K.-I. Harada, W. W. Carmichael & H. Fujiki (eds), Toxic Microcystis. CRC, Boca Raton, U.S.A: 35–56.Google Scholar