Chronic toxicity of the veterinary antibiotic florfenicol to Daphnia magna assessed at two temperatures

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Martins, A (Autor) Outra; Guimaraes, L (Autor) Outra; Guilhermino, L. (Autor) ICBAS

Revista

Título: Environmental Toxicology and Pharmacology

Vol. 36

Páginas: 1022-1032

ISSN: 1382-6689

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-008-ERX

DOI: 10.1016/j.etap.2013.09.001

Abstract (EN): The hypothesis that temperature variation is able to modify the chronic toxicity of the antibiotic florfenicol (FLO) to Daphnia magna was tested in the present study. Twenty-one day laboratory bioassays were carried out at 20 and 25 degrees C. FLO concentrations and its potential decay during the assays were checked by spectrophotometry. At 20 degrees C, FLO significantly reduced the D. magna somatic growth (>= 1.6 mg/L) and impaired its reproduction (EC20 = 6.9 mg/L; EC50 = 7.6 mg/L), with the population growth rate becoming negative at 12.6 mg/L. At 25 degrees C, the EC values were lower (1.7 and 1.9 mg/L, respectively) than at 20 degrees C, as well as the lowest exposure concentration causing a negative population growth rate (3.1 mg/L). These results clearly indicate that temperature raise from 20 to 25 degrees C was able to modify the FLO toxicity. Therefore, more studies on the combined effects of temperature changes and environmental contaminants are needed to improve the basis for ecological risk assessment, environmental and human safety.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11