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Efecto del cadmio sobre la mortalidad de adultos de Polydora sp. (Polychaeta: Spionidae) en el laboratorio.

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Bibliographic Details
Title: Efecto del cadmio sobre la mortalidad de adultos de Polydora sp. (Polychaeta: Spionidae) en el laboratorio.
Alternate Title: Effect of cadmium on adult mortality of Polydora sp. (Polychaeta: Spionidae) under laboratory conditions.
Authors: Herrera-Perez, Melissa1,2 imelissa.herrera.p@gmail.com, Méndez, Nuria3 nuri@ola.icmyl.unam.mx
Source: Revista de Biología Tropical. 2019 Supplement 5, Vol. 67, p110-118. 9p.
Subjects: COASTAL wetlands, POLYCHAETA, MAGNITUDE (Mathematics), SALINITY, MORTALITY
Geographic Terms: PERU
Abstract (English): Introduction: Several studies have demonstrated the effect of Cd on mortality and other physiological responses of some polychaete species. Objective: to evaluate the toxic effect of Cd on adults mortality of Polydora sp as a test species for ecotoxicological studies. Methods: The specimens were collected in the coastal wetland of Poza de la Arenilla, Callao, Peru. The organisms were acclimatized for two weeks with seawater and sediment and then, three days in seawater, with 30 ‰ of salinity and temperature between 20 to 22 °C. The organisms were exposed to the nominal concentrations 75, 11.25, 1.69, 0.25; 0.04 mg/L of Cd and a control. Three replicates of ten individuals per treatment were analyzed for 72 hours to register mortality. The Kruskal-Wallis and U-Man Whitney tests were applied to detect significant differences among treatments. Results: The adverse effect of Cd on mortality was much more evident in the treatments of 11.25 and 75 mg/L after the first 24 hours of exposure. The mean lethal concentration of Cd at 72h was 2.59 mg/L. Conclusions: the LC50 is in the same order of magnitude as other polychaete species. This is the first ecotoxicological study in Peru using polychaetes under laboratory conditions. It is suggested the use of Polydora sp as a test species in ecotoxicology experiments, using nominal sublethal concentrations of Cd not exceeding 1.6 mg/L. for the observation of several physiological responses. [ABSTRACT FROM AUTHOR]
Abstract (Spanish): Introducción: diversos estudios han demostrado el efecto del Cd sobre la mortalidad y otras respuestas fisiológicas de diversas especies de poliquetos. Objetivo: evaluar el efecto tóxico del Cd en la mortalidad de adultos de Polydora sp. como especie prueba para estudios ecotoxicológicos. Métodos: los especímenes fueron recolectados en el humedal costero Poza de la Arenilla, Callao, Peru. Los organismos fueron aclimatados durante dos semanas con agua de mar y sedimento y posteriormente, tres días en agua de mar, con 30 ‰ de salinidad y temperatura entre 20 a 22 °C. Los organismos se expusieron a las concentraciones nominales 75, 11.25, 1.69, 0.25; 0.04 mg/L de Cd y un control. Se analizaron tres réplicas de diez individuos por tratamiento durante 72 horas para registrar mortalidad. Se aplicaron las pruebas de Kruskal-Wallis y de U-Man Whitney para detectar las diferencias significativas entre tratamientos. Resultados: el efecto adverso del Cd sobre la mortalidad fue mucho más evidente en los tratamientos de 11.25 y 75 mg/L a partir de las primeras 24 horas de exposición. La concentración letal media de Cd a 72h fue de 2.59 mg/L. Conclusiones: la CL50 está en el mismo orden de magnitud de otras especies de poliquetos. Este es el primer estudio ecotoxicológico en Perú con poliquetos en condiciones de laboratorio. Se sugiere la utilización de Polydora sp. como especie prueba en experimentos de ecotoxicología, utilizando concentraciones nominales subletales de Cd que no superen los 1.6 mg/L para la observación de varias respuestas fisiológicas. [ABSTRACT FROM AUTHOR]
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Database: MedicLatina
Description
Abstract:Introduction: Several studies have demonstrated the effect of Cd on mortality and other physiological responses of some polychaete species. Objective: to evaluate the toxic effect of Cd on adults mortality of Polydora sp as a test species for ecotoxicological studies. Methods: The specimens were collected in the coastal wetland of Poza de la Arenilla, Callao, Peru. The organisms were acclimatized for two weeks with seawater and sediment and then, three days in seawater, with 30 ‰ of salinity and temperature between 20 to 22 °C. The organisms were exposed to the nominal concentrations 75, 11.25, 1.69, 0.25; 0.04 mg/L of Cd and a control. Three replicates of ten individuals per treatment were analyzed for 72 hours to register mortality. The Kruskal-Wallis and U-Man Whitney tests were applied to detect significant differences among treatments. Results: The adverse effect of Cd on mortality was much more evident in the treatments of 11.25 and 75 mg/L after the first 24 hours of exposure. The mean lethal concentration of Cd at 72h was 2.59 mg/L. Conclusions: the LC50 is in the same order of magnitude as other polychaete species. This is the first ecotoxicological study in Peru using polychaetes under laboratory conditions. It is suggested the use of Polydora sp as a test species in ecotoxicology experiments, using nominal sublethal concentrations of Cd not exceeding 1.6 mg/L. for the observation of several physiological responses. [ABSTRACT FROM AUTHOR]
ISSN:00347744
DOI:10.15517/rbt.v67is5.38936