The effects of Anabaena spiroides exopolysaccharides on copper accumulation in an aquatic food chain

Autor(es)

Nogueira, P. F. M. ^[1] ; Melao, M. G. G. ^[1] ; Lombardi, A. T. ^[2] ; Nogueira, M. M. ^[3] ; Vieira, A. A. H. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Hidrobiol, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Bot, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, EESC, Nucleo Estudos Ecossistemas Aquat, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AQUATIC TOXICOLOGY; v. 93, n. 2-3, p. 125-130, JUN 28 2009.
• Citações Web of Science: 4

Resumo

The influence of Anabaena spiroides exopolysaccharides (EPS) on copper speciation (total dissolved, particulate and free Cu(2+) ions) and bioavailability in aquatic organisms was investigated. Bacteria were used as the first trophic level, Paramecium caudatum (protozoan) as the second and the copepod cyclopoid Metacyclops mendocinus as the third level. The organisms were obtained from a freshwater reservoir and held under continuous laboratory controlled conditions. Freshwater media containing EPS excreted by A. spiroides (10 mg L(-1)) and copper (1.0 x 10(-6) mol L(-1)) were used for bacteria growth. Contamined bacteria were used as food source to protozoan, which was further furnished to copepods. The results showed a reduction of EPS concentration during bacteria growth and also a smaller copper accumulation by microorganisms in the presence of EPS. We concluded that A. spiroides exopolysaccharides have reduced copper entrance into the experimental aquatic microbial food chain. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 02/04275-0 - A influência da matéria orgânica dissolvida de origem natural na transferência do cobre em cadeias tróficas de águas continentais
• Beneficiário: Maria da Graça Gama Melão
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/53235-4 - Efeito da biodegradação de exopolissacarídeos produzidos pela cianobactéria tóxica Cylindrospermopsis raciborskii na biodisponibilidade de metais em uma cadeia alimentar aquática
• Beneficiário: Patricia Franklin Mayrink Nogueira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado