Contribution
Occurrence of microcystin-containing cyanobacterial blooms in freshwaters of Brittany (France)
Vezie, C.; Brient, L.; Sivonen, K.; Bertru, G.; Lefeuvre, J.-C.; Salkinoja-Salonen, M.
Archiv für Hydrobiologie Volume 139 Number 3 (1997), p. 401 - 413
53 références bibliographiques
publié: Jun 6, 1997
DOI: 10.1127/archiv-hydrobiol/139/1997/401
ArtNo. ESP141013903006, Prix: 29.00 €
Abstract
A survey of the occurrence of microcystin-containing cyanobacterial blooms in the freshwaters of Brittany was made in September 1994. Twenty-nine sites, including rivers, ponds and reservoirs were studied. Cyanobacteria were present in twenty-five sites. The microcystin content of twenty-two natural samples and nineteen Microcystis aeruginosa strains isolated from six samples was investigated using HPLC analysis. Most of the bloom samples were dominated by M. aeruginosa species. More than 70 % of the samples collected from the water bodies contained microcystins. Microcystin-LR was the main microcystin found. The microcystin content varied generally from undetectable to 0.73 mg g-1 (freeze-dried cells). Only one sample contained a high concentration of microcystins, 4 mg g-1. Both microcystin-containing and microcystin-non-containing strains were found in cyanobacteria cultures isolated from natural samples. Microcystin content in isolated strains ranged from undetectable to 0.81 mg g-1. This study showed for the first time that microcystin-containing cyanobacteria are frequent in the freshwaters of Brittany. Hence, it is necessary to monitor the cyanobacterial developments in this region to prevent human health hazards.
Mots-clefs
cyanobacterial • blooms • microcystin • HPLC analysis • Brittany