Efectos Letales Y Subletales en Juveniles De Argopecten Nucleus Expuestos a Lodos De Perforación

Abstract

Offshore exploration in Colombia is in its initial stage. Currently, only few studies of acute and chronic toxicity with marine organisms evaluate drilling muds. In this paper, we test acute and chronic toxicity in juvenile organisms of Argopecten nucleus exposed to water and synthetic based muds. Aim is establish lethal median concentration (LC50) to 96 h and effects on survival and growth (height and weight) for a 30 d period. In acute tests, three water based muds (E2-LBA, E2-LBA-2 y E3-LBA-2) are below the minimal value established by EPA (1993) to be discharged in the marine environment. Given the value of the non observable effect concentration (NOEC), samples were ordered in increasing order, E3-WBM-2 < E1-SBM-2 < E1-WBM < E3-SBM-2. According to classifiation established by GESAMP (2002), all drilling muds evaluated from acute and chronic tests are nontoxic or with negligible toxicity, respectively. This results are the fist ones in Colombia using a bivalve specie in acute and chronic toxicity tests exposed to drilling muds.

Toxicidad Del Lodo De Perforación Minera en El Bioindicador Porcellio Laevis (Latreille, 1804) (Crustacea: Isopoda)

“…Concluyendo que el fluido de perforación no tuvo un efecto negativo en la especie estudiada. Rodríguez et al (2015) evaluaron los efectos letales y subletales en lodos de perforación base agua en juveniles de Argopecten nucleus (Born, 1778) en pruebas agudas y crónicas, resultando ser no tóxicos o con un grado de toxicidad despreciable de acuerdo a la clasificación establecida por GESAMP (2002). Méndez et al (2007b) evaluaron la toxicidad de un fluido de perforación minera base agua sobre la germinación de las semillas del frijol (Vigna unguiculata (L.) Walp.…”