Toxicity of urban road dust on reproduction of a benthic ostracod, Heterocypris incongruens Toxicité des poussières de route sur la reproduction d'un ostracode benthique, Heterocypris incongruens

Urban road dust contains a variety of pollutants and might deteriorate the environment quality in the receiving water bodies of urban runoff. Urban road dust may be accumulated in the sediment for the periods of time, thus chronic toxicity should be evaluated. However, toxicity assessment of urban road dust is limited especially in the chronic effect on benthic organisms. This study aimed to assess the toxic effect of road dust on reproduction of a benthic ostracod, Heterocypris incongruens. Road dust toxicity was tested by a newly developed chronic toxicity test method along with ISO14371 method. Endpoints observed in this study were mortality, growth inhibition, egg production and hatching ratio of the eggs produced. Non observed effect concentrations in 6-day mortality and growth inhibition of the road dust were 12.5% and 6.25%, respectively. Statistically significant differences were found in first day of brooding and hatching ratio in the road dust samples which non-toxic in ISO test method. The road dust sample showed toxic effect on ostracod reproduction in the low concentration which did not exhibit 6-day lethal toxicity and growth inhibition.