Pesticidas e densidade bacteriana – análise de uma represa situada em área agrícola

Autores

DOI:

https://doi.org/10.33448/rsd-v11i16.37870

Palavras-chave:

Endrin; Lambda cialotrina; Sulfato de endossulfan.

Resumo

O presente estudo teve como objetivo detectar os tipos e concentrações de agrotóxicos nas águas superficiais de uma represa localizada em uma região agrícola, e relacioná-los com a densidade bacteriana aquática. Foram coletadas seis amostras de 1L de água, três na estação seca (D1, D2 e D3) e três na estação chuvosa (R1, R2 e R3). A análise de pesticidas foi realizada usando CG/MS. A densidade bacteriana foi analisada por meio de contagem de UFC. As colônias mais abundantes cultivadas em todas as amostras estudadas foram isoladas e identificadas por métodos moleculares. A densidade bacteriana apresentou diferença significativa entre as estações chuvosa e seca. Na estação seca, a densidade bacteriana média (5,69x105±2,86 x105 UFC mL-1) foi maior do que na estação chuvosa (2,31x105±1,73 x105 UFC mL-1). Na estação seca, lambda cialotrina (0,3 µg L -1) e endrin (0,23 µg L -1) foram encontrados na coleta D1 e sulfato de endosulfan em D1 e D2 (0,05 - 0,27 µg L -1). Na estação chuvosa, DEA (0,02 - 0,09 µg L-1) e atrazina (0,02 - 0,06 µg L -1) foram detectados em todas as coletas, metalacloro (0,2 µg L -1), clorpirifós (0,2 µg L -1) em R1 e R2 e sulfato de endossulfam (0,1 µg L -1) em R1. Na estação seca, a densidade bacteriana em R1 foi significativamente menor que R2 e R3. Observou-se alta correlação entre esses pesticidas e a densidade bacteriana. Endrin, lambda cialotrina e sulfato de endosulfan são pesticidas tóxicos e persistentes e podem, portanto, ter influenciado a diminuição da densidade bacteriana aquática. As análises moleculares identificaram a bactéria Bacillus weihenstephanensis, conhecida por estar presente em ambientes contaminados por agrotóxicos e por seu potencial biodegradável.

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16/12/2022

Como Citar

DAHROUG, Z.; BRAGA, J. K.; DORES, E. F. G. de C. .; HARDOIM, E. L. Pesticidas e densidade bacteriana – análise de uma represa situada em área agrícola . Research, Society and Development, [S. l.], v. 11, n. 16, p. e527111637870, 2022. DOI: 10.33448/rsd-v11i16.37870. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/37870. Acesso em: 22 dez. 2024.

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Ciências Agrárias e Biológicas