Active avoidance from a crude oil soluble fraction by an Andean paramo copepod

作者：Araujo Cristiano V M^*; Moreira Santos Matilde; Sousa Jose P; Ochoa Herrera Valeria; Encalada Andrea C; Ribeiro Rui

来源：Ecotoxicology, 2014, 23(7): 1254-1259.

DOI：10.1007/s10646-014-1268-9

• Ecuador
• Paramo
• Non-forced exposure
• Oil spill
• Polycyclic aromatic hydrocarbons

Several oil spills due to ruptures in the pipeline oil systems have occurred at the Andean paramo. A sample of this crude oil was mixed with water from a nearby Andean lagoon and the toxicity of the soluble fraction was assessed through lethal and avoidance assays with a locally occurring copepod (Boeckella occidentalis intermedia). The integration of mortality and avoidance aimed at predicting the immediate decline of copepod populations facing an oil leakage. The 24-h median lethal PAH concentration was 42.7 (26.4-91.6) A mu g L-1. In the 12-h avoidance assay, 30 % avoidance was recorded at the highest PAH concentration (19.4 A mu g L-1). The mortality at this PAH concentration would be of 25 % and, thus, the population immediate decline would be of 55 %. The inclusion of non-forced exposure testing with the quantification of the avoidance response in environmental risk assessments is, therefore, supported due to underestimation of the lethal assays.

• 出版日期2014-9