Publicación: Analisis de supervivencia de Chironomus riparius expuesto al disruptor endocrino BPA (Bisfenol-A)
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2011-06-28
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Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias.
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Chironomus riparius es un invertebrado béntico utilizado como bioindicador en ensayos toxicológicos, proporcionando datos relevantes sobre el estado de contaminación de ríos y acuíferos. Las dos razones principales para su utilización son su desarrollo larvario en los sedimentos, zona habitual de acumulación de tóxicos, y su papel relevante en la cadena trófica y por tanto en la bioacumulación de los tóxicos en el ecosistema. El Bisfenol A (BPA) es un tóxico presente principalmente en plásticos cuyos efectos como disruptor endocrino han sido ampliamente documentados en vertebrados a niveles muy por debajo de los permitidos. En humanos se ha encontrado BPA en tejidos y orina, y su presencia en envases en contacto con los alimentos ha generado gran controversia. En el presente estudio se realizaron tests de toxicidad del Chironomus riparius en BPA a diferentes concentraciones y tiempos, y se analizó la supervivencia ajustándola por dos métodos de modelos paramétricos (Gehan Siddiqui y ajuste por mínimos cuadrados) y mediante el modelo biológico de la teoría DEB (Dynamic Energy Budget). Cada uno de ellos reveló tanto ventajas como carencias de diferentes tipos, lo que sugiere la necesidad de investigar nuevos modelos biológicos y toxicocinéticos adaptados al Chironomus riparius y sus singulares características.
Chironomus riparius is a benthic invertebrate, often used as bioindicator in toxicological assays, providing relevant data on the state of pollution of rivers and aquifers. There are two main reasons for its use: its larval development in sediments, which usually is an area of pollutant accumulation, and its role in the food chain and therefore bioaccumulation of toxins in the ecosystem. Bisphenol A (BPA) is a chemical present mainly in plastics, and its endocrine disrupting effects have been extensively documented in vertebrates at levels well below the allowable. In humans, BPA has been found in tissues and urine and their presence in packaging in contact with food has generated much controversy. In the present study toxicity tests of Chironomus riparius in BPA were made at different concentrations and times, and survival analysis was adjusted by two parametric modeling methods (Gehan - Siddiqui and least squares) and by the biological model of the DEB theory (Dynamic Energy Budget). Each of them revealed both advantages and shortcomings of different types, which suggests the need of further investigation in new biological and toxicokinetic models, adapted to the unique characteristics of Chironomus riparius.
Chironomus riparius is a benthic invertebrate, often used as bioindicator in toxicological assays, providing relevant data on the state of pollution of rivers and aquifers. There are two main reasons for its use: its larval development in sediments, which usually is an area of pollutant accumulation, and its role in the food chain and therefore bioaccumulation of toxins in the ecosystem. Bisphenol A (BPA) is a chemical present mainly in plastics, and its endocrine disrupting effects have been extensively documented in vertebrates at levels well below the allowable. In humans, BPA has been found in tissues and urine and their presence in packaging in contact with food has generated much controversy. In the present study toxicity tests of Chironomus riparius in BPA were made at different concentrations and times, and survival analysis was adjusted by two parametric modeling methods (Gehan - Siddiqui and least squares) and by the biological model of the DEB theory (Dynamic Energy Budget). Each of them revealed both advantages and shortcomings of different types, which suggests the need of further investigation in new biological and toxicokinetic models, adapted to the unique characteristics of Chironomus riparius.
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Facultades y escuelas::Facultad de Ciencias
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Física Matemática y de Fluídos