First report of microcystins and anatoxin-a co-occurrence in San Roque reservoir (Córdoba-Argentina)

RUIZ, MARCIA; GALANTI, LUCAS NICOLÁS; RUIBAL, ANA LAURA; RODRIGUEZ, MARÍA INÉS; WUNDERLIN, DANIEL ALBERTO; AMÉ, MARÍA VALERIA

SPRINGER

Lugar: Berlin; Año: 2013 vol. 224 p. 2 - 2

he aim of this study was to evaluate the presence of microcystin-LR, microcystin-RR,microcystin-YR, and the neurotoxin anatoxin-a in water samples collected monthly during 1 year inSan Roque reservoir (Córdoba, Argentina) to identify the environmental factors that could  promote the presence of these cyanotoxins. The HPLC-UV and MS/MS analysis showed the presence of microcystin in most of the sampling times, even when Cyanobacteria were subdominant. Microcystin concentrations varied from not detectable levels to 119.0 μg/ L. Thus, they frequently surpassed the guidelines suggested by WHO for drinking water (1 μg/ L) and recreational exposure (20 μg/ L). To the extent of our knowledge, this is the first report ofanatoxin-a in freshwaters in South America. Anatoxin-a concentrations varied from not detectable levels to 6.6 ng/ L, a thousand times below the provisional guideline adopted by New Zealand for drinking water. Microcystin showed significant