Sensitivities of three tropical indigenous freshwater invertebrates to single and mixture exposures of diuron and carbofuran and their commercial formulations

Odete Rocha, Antônio José Gazonato Neto, Júlio César dos Santos Lima, Emanuela Cristina Freitas, Mariana Miguel, Adrislaine da Silva Mansano, Raquel Aparecida Moreira, Michiel Adriaan Daam

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

As compared to their temperate counterparts, few toxicity tests have been conducted so far into the evaluation of the sensitivity of indigenous tropical species to pesticides. Especially mixture toxicity assessments appear to be scarce. To contribute to increase our knowledge in this arena, we evaluated the acute toxicity of diuron and carbofuran and their mixtures to the neotropical oligochaetes Allonais inaequalis and Dero furcatus, and the ostracod Strandesia trispinosa. Tests were performed with both the pure active ingredients, as well as their formulated products. The toxicity of the latter to the three test organisms was generally greater than that of the pure active ingredients, although absolute differences were rather small. The sensitivity of the indigenous species was slightly greater than temperate test species from the same taxonomic groups. The concentration addition conceptual model best described the results of the mixture toxicity data. Derived deviations of this model appeared to be dependent on the test organism and as to whether the pesticides were applied as active ingredients or their commercial products. Reported field concentrations of the two pesticides indicate risks to freshwater biota, especially if they are both present. The test species used in the present study are concluded to be suitable candidates as surrogate test organisms in local pesticide risk evaluations.

Original languageEnglish
Pages (from-to)834-844
Number of pages11
JournalEcotoxicology
Volume27
Issue number7
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Acute toxicity
  • Aquatic ecotoxicology
  • Oligochaete
  • Ostracod
  • Pesticide mixtures
  • Tropics

Fingerprint

Dive into the research topics of 'Sensitivities of three tropical indigenous freshwater invertebrates to single and mixture exposures of diuron and carbofuran and their commercial formulations'. Together they form a unique fingerprint.

Cite this