Genotoxic analysis in aquatic environment under influence of cyanobacteria, metal and radioactivity.
The micronucleus (MN) and nuclear abnormality (NA) tests were employed to evaluate the genotoxic potential of the Lucrecia dam (RN, Brazil) located in a semi-arid region and influenced by crop irrigation and irregular rainfall. The analyses of these water samples demonstrated the presence of several cyanobacteria as well as metals and radioactivity. The Nile Tilapia (Oreochromis niloticus) was used for micronucleus and nuclear abnormality assays and analysis of metal concentrations in gills and liver samples. Genotoxic assays in source water fish showed a significant increase in the frequency of nuclear damage (MN and NA) in relation to the negative control group. In conclusion, the results obtained with water surface and biological samples from the Lucrecia dam suggest that this important water resource contains a number of chemical and microbiological pollutants with genotoxic potential and that these substances may be compromising the species inhabiting this ecosystem. Particular care must be taken to prevent further degradation of this water supply. Capsule: A battery of assay was successfully applied to assess the water quality of Lucrecia dam from a Northeastern region of Brazil.
Marcon
Alexandre Endres
AE
Programa de Pós-graduação em Ciências da Saúde, Centro de Ciências da Saúde, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil.
Ferreira
Douglisnilson de Morais
Dde M
de Moura
Maria de Fátima Vitória
Mde F
Campos
Thomas Ferreira da Costa
TF
do Amaral
Viviane Souza
VS
Agnez-Lima
Lucymara Fassarella
LF
Batistuzzo de Medeiros
Sílvia Regina
SR
D000818:Animals; D023681:Cichlids / Q000502:physiology; D000458:Cyanobacteria / Q000145:classification / Q000254:growth & development* / Q000302:isolation & purification; D004784:Environmental Monitoring; D008670:Metals / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D015162:Micronucleus Tests; D009153:Mutagens / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D014875:Water Pollutants, Radioactive / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*
D008670:Metals; D009153:Mutagens; D014874:Water Pollutants, Chemical; D014875:Water Pollutants, Radioactive