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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cyanotoxin contamination of semiarid drinking water supply reservoirs

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Author(s):
Lorenzi, Adriana Sturion [1] ; Cordeiro-Araujo, Micheline Kezia [1] ; Chia, Mathias Ahii [2] ; Bittencourt-Oliveira, Maria do Carmo [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Biol Sci, Luiz de Queiroz Coll Agr, Piracicaba, SP - Brazil
[2] Ahmadu Bello Univ, Dept Bot, Zaria - Nigeria
Total Affiliations: 2
Document type: Journal article
Source: ENVIRONMENTAL EARTH SCIENCES; v. 77, n. 16 AUG 2018.
Web of Science Citations: 2
Abstract

Changing global climatic conditions and the continuous eutrophication of aquatic ecosystems have led to increased frequency, duration and toxicity of cyanobacterial blooms worldwide. This makes the provision of time series information on cyanotoxins extremely crucial for effective monitoring and management of water resources. The objective of the present study was to investigate seasonal and annual changes in microcystins (MCs), cylindrospermopsins (CYNs), saxitoxins (STXs), neo-saxitoxin (neo-STX) and anatoxin-a (ATX-a) concentrations in 11 public water supply reservoirs in the semiarid region of Brazil, from 2004 to 2011. Per time, at least one cyanotoxin was present in all the investigated reservoirs. High levels of MCs, CYNs, STXs and Neo-STX were detected simultaneously in Carpina, Duas Unas, Ipojuca, and Jucazinho reservoirs. All the investigated reservoirs had significant concentrations of MCs. The highest levels of MCs were found in Carpina (303,300.0 ng g(-1)) and Duas Unas (122,053.9 ng g(-1)) reservoirs, while the lowest concentration of the hepatotoxins was recorded in Ipojuca (10.3 ng g(-1)) reservoir. On the other hand, CYN was detected in four reservoirs, STXs and Neo-STX in ten reservoirs and ATX-a in two reservoirs. The first record of CYN in Carpina reservoir was obtained in 2006. In addition, Carpina reservoir had the highest concentration of STXs and Neo-STX in the dry and rainy seasons, respectively. The high concentration of cyanotoxins observed in most samples obtained from semiarid reservoirs in Brazil demonstrates the need for regular monitoring and updated management programs. (AU)

FAPESP's process: 13/11306-3 - The Effects of anatoxin-a and cylindrospermopsin at different nitrogen concentrations and photon irradiances on the physiology of Microcystis aeruginosa (Cyanobacteria) and Scenedesmus acuminatus (Chlolrophyta)
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/01913-2 - Comparative Metagenomics of cyanobacterial blooms in freshwater reservoirs from Pernambuco State
Grantee:Adriana Sturion Lorenzi
Support Opportunities: Scholarships in Brazil - Young Researchers
FAPESP's process: 15/17397-6 - CIRCADIAN RHYTHM IN THE PRODUCTION AND RELEASE OF MICROCYSTINS, EXPRESSION OF mcyE GENE AND PHYSIOLOGICAL STRESS IN CYANOBACTERIA: IMPLICATIONS OF GLOBAL CLIMATE CHANGES
Grantee:Micheline Kézia Cordeiro de Araújo
Support Opportunities: Scholarships in Brazil - Post-Doctoral