Feeding inhibition in the soil collembolan Folsomia candida as an endpoint for the estimation of organic waste ecotoxicity

Abstract

Despite the increasing quantities of organic wastes that are being reused in soils, there are few studies that focus on the selection of bioassays for the ecotoxicological risk assessment of organic wastes to soils. In the present study, differences in feeding inhibition in the soil collembolan Folsomia candida were evaluated as an ecotoxicological endpoint for the assessment of risk to soils amended with polluted organic wastes. Seven organic wastes (dewatered sewage sludges, thermally dried sewage sludges, composted sewage sludges, and a thermally dried pig slurry) were tested. These wastes had different origins, treatments, and pollutant burdens, and were selected as a representative sample of the wide variety of wastes currently generated. A clear dose response was observed for this parameter, with an increase in percentage of individual feeding inhibition with increased doses of organic wastes. More significantly, feeding inhibition correlated highly with mortality and reproduction inhibition in the different wastes. Composted sludges displayed the lowest toxicity, followed by thermally dried sludge and dewatered sludge. Thermally dried pig slurry showed the highest toxicity for feeding, with lower median effective concentration (EC50) values than the lowest dose tested. Among waste physicochemical parameters and pollutants, low organic matter stability appeared to be the main predictor of potential adverse effects on soil fauna, because it correlated significantly with feeding inhibition and mortality. Furthermore, feeding inhibition tests were run over a short exposure time (less than 7 d), which, together with the results obtained, makes this bioassay a good screening tool for organic waste toxicity.

Colémbolos (Hexapoda) como bioindicadores de la calidad de suelos

“…Es posible que los ácaros y colémbolos en las zonas contaminadas se alimenten de bacterias y hongos, los cuales toleran y biodegradan altas concentraciones de hidrocarburos (Atlas, 1991;Rivera et al, 2002). Domene et al, (2007) utilizaron a Folsomia candida y F. fi metaria en ensayos de toxicidad con lodos de aguas residuales, estas especies ingieren el lodo solamente, cuando no existe alimento sin contaminar, también se sabe que F. candida deja de alimentarse al aumentar la concentración de lodos residuales.…”

Aplicação Da Robótica Na Monitoração Ambiental

“…Estudos apontam que os testes de ecotoxicologia terrestre visam mapear os possíveis impactos de substancias ou resíduos que diariamente contaminam o ambiente como os pesticidas e lodos de esgoto (FÖRSTER et al, 2004;DOMENE ET AL., 2007); outrossim almejam avaliar os metais pesados ou petróleo e seus efeitos destrutivos nas contaminações de áreas ambientais já impactadas (LUZ et al, 2004).…”

Desenvolvimento Sustentável E Economia Circular: Contribuição Para a Gestão De Resíduos Sólidos Em Um Centro Urbano

“…As microalgas são normalmente utilizadas em testes bioensaios toxicológicos pelo fato de serem sensíveis a substancias estressoras de diferentes tipos de poluição, tornando-as de suma importância para o monitoramento ecológico ambiental, sabendose que estas se mostram limitantes quanto as variáveis de iluminação e aeração para o seu crescimento, (SIPAÚBA-TAVARES & ROCHA, 2003;SIPAÚBA-TAVARES et al, 2009). Estudos apontam que os testes de ecotoxicologia terrestre visam mapear os possíveis impactos de substancias ou resíduos que diariamente contaminam o ambiente como os pesticidas e lodos de esgoto (FÖRSTER et al, 2004;DOMENE ET AL., 2007); outrossim almejam avaliar os metais pesados ou petróleo e seus efeitos destrutivos nas contaminações de áreas ambientais já impactadas (LUZ et al, 2004).…”