| Full text | |
| Author(s): |
Nogueira, P. F. M.
[1]
;
Melao, M. G. G.
[1]
;
Lombardi, A. T.
[2]
;
Nogueira, M. M.
[3]
;
Vieira, A. A. H.
[2]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | AQUATIC TOXICOLOGY; v. 93, n. 2-3, p. 125-130, JUN 28 2009. |
| Web of Science Citations: | 4 |
| Abstract | |
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) | |