Occurrence of anatoxin-a(s) during a bloom of Anabaena crassa in a water-supply reservoir in southern Brazil

Becker, Vanessa; Ihara, Priscila; Yunes, João Sarkis; Huszar, Vera Lúcia M.

Occurrence of anatoxin-a(s) during a bloom of Anabaena crassa in a water-supply reservoir in southern Brazil

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dc.contributor.author	Becker, Vanessa
dc.contributor.author	Ihara, Priscila
dc.contributor.author	Yunes, João Sarkis
dc.contributor.author	Huszar, Vera Lúcia M.
dc.date.accessioned	2020-12-08T23:32:35Z
dc.date.available	2020-12-08T23:32:35Z
dc.date.issued	2009-06-09
dc.description.resumo	Cyanobacterial blooms and the accompanying production of cyanotoxins are a serious global problem. Toxic blooms of Anabaena species are common in lagoons and reservoirs of southern Brazil. Worldwide, species of the genus Anabaena produce the majority of the known hepatotoxins (microcystins) and neurotoxins [anatoxin-a, anatoxin-a(s), and saxitoxins]. This report links a bloom of Anabaena crassa in the Faxinal Reservoir, the main water supply for the city of Caxias do Sul (400,000 inhabitants) in southern Brazil, to the occurrence of anatoxin-a(s) in the water. During the bloom period, the reservoir was strongly stratified, with higher temperatures and a deep anoxic hypolimnion. Two methods for sample concentration (direct and complete extraction) were tested, and direct extraction of samples proved to be more efficient. Water samples collected during the bloom showed 9% acetylcholinesterase inhibition at 50 mg mL−1, corresponding to 0.61μg of anatoxin-a(s) per gram of lyophilized powder. At these concentrations, symptoms of neurotoxicity and mortality were not observed in tests with Swiss albino mice. Although the concentrations of anatoxin-a(s) in the Faxinal Reservoir were low, these results are important because this is the first record of the toxin for A. crassa. Furthermore, this cyanotoxin is not yet included in Brazilian legislation for drinking-water monitoring, because of the lack of information about toxicity levels and risk calculation for oral doses. The data presented here contribute to the basis for the future inclusion of this toxin in Brazilian legislation for drinking-water quality control, and for the development of analytical methods for this toxin	pt_BR
dc.identifier.citation	BECKER, Vanessa; IHARA, Priscila; YUNES, João Sarkis; HUSZAR, Vera Lúcia M.. Occurrence of anatoxin-a(s) during a bloom of Anabaena crassa in a water-supply reservoir in southern Brazil. Journal Of Applied Phycology, [S.L.], v. 22, n. 3, p. 235-241, 9 jun. 2009. Springer Science and Business Media LLC. Disponível em <https://link.springer.com/article/10.1007%2Fs10811-009-9451-8>. Acesso em 20 out 2020. http://dx.doi.org/10.1007/s10811-009-9451-8.	pt_BR
dc.identifier.doi	10.1007/s10811-009-9451-8
dc.identifier.issn	1573-5176
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30934
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Acetylcholinesterase	pt_BR
dc.subject	Cyanobacteria	pt_BR
dc.subject	Cyanotoxin	pt_BR
dc.subject	Subtropical	pt_BR
dc.title	Occurrence of anatoxin-a(s) during a bloom of Anabaena crassa in a water-supply reservoir in southern Brazil	pt_BR
dc.type	article	pt_BR