Effects of Dietary Copper on Life-History Traits of a Tropical Freshwater Cladoceran

Autor(es)

Gusso-Choueri, P. K. ^{[1, 2, 3]} ; Choueri, R. B. ^[1] ; Lombardi, A. T. ^[4] ; Melao, M. G. G. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Santa Cecilia, Dept Ecotoxicol, BR-11045907 Santos, SP - Brazil

^[2] Univ Fed Sao Paulo, BR-11060000 Santos, SP - Brazil

^[3] Univ Fed Parana, Programa Posgrad Ecol & Conservacao, Setor Ciencias Biol, BR-81531980 Curitiba, PR - Brazil

^[4] Univ Fed Sao Carlos, Ctr Ciencias Biol & Saude, BR-13565905 Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Archives of Environmental Contamination and Toxicology; v. 62, n. 4, p. 589-598, MAY 2012.
• Citações Web of Science: 5

Resumo

Life-history parameters of Ceriodaphnia cornuta (Cladocera: Daphniidae) fed on Pseudokirchneriella subcapitata (Chlorophyceae) exposed to different copper concentrations were investigated. C. cornuta individuals were reared in four treatments: (a) reconstituted water and non-contaminated algae (RW); (b) reconstituted water and copper-contaminated algae with either 1.28 x 10(-13) (10(-7)Cu) or (c) 1.93 x 10(-13) g Cu cell(-1) (10(-6)Cu); and (d) natural water from a local reservoir and non-contaminated algae (NW). Copper content in C. cornuta individuals increased as diet-borne exposure increased (RW < 10(-7)Cu < NW < 10(-6)Cu), except for NW individuals, which exhibited higher copper body burden than RW and 10(-7)Cu individuals, suggesting that some copper was available in the natural water. The results suggest that subacute levels of dietary copper stimulated C. cornuta's growth and reproduction, whereas organisms reared on reconstituted water showed nutritional deficiency. Depending on copper exposure concentration, either growth (lower Cu concentration) or reproduction (higher Cu concentration) was further stimulated, suggesting that an alteration of resource allocation is involved in diet-borne copper exposure. Because differences among treatments were only significantly different after day 12 of the experiment, our results reinforce that full life-cycle tests are more appropriate than the standard 7 day or three-brood chronic bioassays used to evaluate dietary copper effects at low, chronic copper inputs and that the use of standard test-organisms may not address site-specific situations for tropical environments. (AU)

• Processo FAPESP: 08/02078-9 - Estudos ecofisiológicos e de processos produtivos do Anostraca dulcícola Dendrocephalus brasiliensis Pesta 1921 e suas implicações nas comunidades zooplanctônica e nectônica
• Beneficiário: Maria da Graça Gama Melão
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 08/03487-0 - Cultivo de microalgas em fotobiorreator como ferramenta para o sequestro do CO2 atmosférico
• Beneficiário: Ana Teresa Lombardi
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - PITE