Immediate and mid-term effects of pyrimethanil toxicity on microalgae by simulating an episodic contamination

Autor(es)

Shinn, Candida ^{[1, 2, 3]} ; Delello-Schneider, Danieli ^[4] ; Mendes, Lucas B. ^[4] ; Sanchez, Andre L. ^[4] ; Mueller, Ruth ^[5] ; Espindola, Evaldo L. G. ^[4] ; Araujo, Cristiano V. M. ^{[1, 2, 6]}

Afiliação do(s) autor(es)

^[1] Univ Coimbra, IMAR Inst Mar, P-3001401 Coimbra - Portugal

^[2] Univ Coimbra, MARE Marine & Environm Sci Ctr, Dept Life Sci, P-3001401 Coimbra - Portugal

^[3] Pontificia Univ Catolica Ecuador, Escuela Ciencias Agr & Ambientales, Sede Ibarra, Ibarra - Ecuador

^[4] Univ Sao Paulo, Ctr Water Resources & Appl Ecol, Sao Carlos, SP - Brazil

^[5] Biodivers & Climate Res Ctr BiK F, Dept Climate & Adaptat, Frankfurt - Germany

^[6] Univ Laica Eloy Alfaro Manabi ULEAM, Cent Dept Res, Manta - Ecuador

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 120, p. 407-413, FEB 2015.
• Citações Web of Science: 4

Resumo

Since pesticides can represent a threat for non-target aquatic communities, including microalgae, we looked at the effects of the fungicide pyrimethanil on the growth of the freshwater green microalgae Selenastrum capricomutum. Additionally, attenuation of the toxicity of pyrimethanil due to its dissipation in the water was assessed. Pyrimethanil-contaminated samples were taken from outdoor mesocosms one (1.4 mg L-1 of pyrimethanil) and ten (0.78 mg L-1 of pyrimethanil) days after pyrimethanil application. Different dilutions were prepared using both nutrient-rich culture medium (LC Oligo) and non-contaminated mesocosm samples, and cell growth inhibition was assessed. Reference mesocosm samples were also diluted with LC Oligo in order to verify how the nutrient concentration in the LC Oligo could improve cell growth. Comparing cell growth of population exposed to pyrimethanil-treated sample taken at day 1 with cells growing in reference sample and LC Oligo, the growth inhibition was 80% (+/-6.5) and 95% (+/-2.0), respectively. The toxicity of samples taken from contaminated mesocosms at day 10 was attenuated to 34% (+/-15) (when compared with reference sample) and 88% (+/-3.0) (when compared with LC Oligo), as pyrimethanil concentrations in the mesocosms decreased. In conclusion, (i) pyrimethanil can be an environmental disturber for the microalgae; (ii) the toxicity of pyrimethanil in water was reduced almost 2.4 times (when compared with the reference sample) at as short a period as 10 d if assuming that pesticide entrance is not continuous; (iii) toxicity of an environmental sample could be underestimated if the sample/medium used in dilution presents different nutrient levels. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/07218-6 - Análise do potencial de toxicidade do cromo em populações fito e zooplanctônicas e em suas interações tróficas através de aspectos estruturais e fisiológicos: um estudo laboratorial e in situ
• Beneficiário: Evaldo Luiz Gaeta Espindola
• Modalidade de apoio: Auxílio à Pesquisa - Regular