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

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Martins, A (Author) Other; Guimaraes, L (Author) Other; Guilhermino, L. (Author) ICBAS

Journal

Title: Environmental Toxicology and Pharmacology

Vol. 36

Pages: 1022-1032

ISSN: 1382-6689

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 1 Citation

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11