Abstract
In a model ecosystem study, the isopod Porcellio scaber was found to accumulate the herbicide trifluralin and its metabolites with body concentrations from 7–19 times those in litter and topsoil. Concentrations in adult P. scaber were much lower than those found in earthworms, in juvenile P. scaber and in the faeces of P. scaber. No effects of trifluralin applied at recommended rates on P. scaber feeding and defaecation rates nor on weight development and mortality, could be demonstrated. P. scaber is easy to handle as a test organism, but problems arise in relation to standardisation and reproducibility of weight development studies.
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