Occurrence of Microcystis aeruginosa and microcystins in Rio de la Plata river (Argentina)
Acta toxicol. argent
; 15(1): 8-14, jul. 2007. ilus, tab
Article
de En
| LILACS
| ID: lil-564848
Bibliothèque responsable:
AR1.1
ABSTRACT
This paper is the first report on microcystins producer blooms of Microcystis aeruginosa in the Argentinean coast of the R¨ªo de la Plata river, the most important drinkingwater supply of Argentina. The distribution of toxic cyanobacterium Microcystis cf. aeruginosa blooms in the Argentinean coast of the Rio de la Plata river was studied from December 2003 and January 2006. Microcystis aeruginosa persisted in the river with values ranged between 0 -7.8 104 cells ml-1. Samples of two Microcystis aeruginosa water blooms were collected at La Plata river and were analyzed by the mouse bioassay and by high-performance liquid chromatography with Diode-array and MS detector. The samples showed high hepatotoxicityin mouse bioassay and, in accordance, important amount of microcystins. The bloom samples contained microcystins LR and a variant of microcystin with a molecular ion [M+H]+= 1037.8 m/z as major components. The total toxin content found in these samples was 0.94¦Ìg/mg and 0.69¦Ìg/mg of lyophilised cells. We conclude that the presence of toxic clones of Microcystisaeruginosa in the Argentinean coast of the Rio de la Plata is an actual sanitary and environmental problem and that further studies are necessary to make the risk assessment.
Mots clés
Texte intégral:
1
Indice:
LILACS
Sujet Principal:
Toxines bactériennes
/
Microbiologie de l'eau
/
Cyanobactéries
/
Microcystines
Type d'étude:
Risk_factors_studies
Limites du sujet:
Animals
Pays comme sujet:
America do sul
/
Argentina
langue:
En
Texte intégral:
Acta toxicol. argent
Thème du journal:
SAUDE PUBLICA
/
TOXICOLOGIA
Année:
2007
Type:
Article