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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/20637

Title: Employing the freshwater snail Physa venustula Gould as an ecotoxicological tool for environmental risk assessments by pesticides
Authors: Iannacone, José O.
Caballero, Cecilia R.
Alvariño, Lorena F.
Keywords: agrochemical, Physa   , soil, chlorpyrifos, lindane, metamidophos
agroquímico, Physa   , suelo, clorpirifos, lindano, metamidofos
Issue Date: 31-Dec-2002
Publisher: Instituto de Investigaciones Agropecuarias, INIA
Citation: Agricultura Técnica (ISSN: 0365-2807) Vol 62 Num 2
Abstract: A standardized ecotoxicological evaluation of soil pesticides such as lindane, chlorpyrifos and metamidofos was realized at Federico Villarreal University, Lima, Peru, employing the freshwater snail Physa venustula   as a tool for environmental risk assessment. The values determined for mean lethal concentration (LC 50 ) for the lethal effect of the pesticides evaluated were at 24, 48 and 96 h of exposure respectively: lindane 811.89, 715.30 and 415 m g L -1 ; chlorpyrifos 379.13, 154 and 66.01 m g L -1 and metamidofos 1 791, 391.33 and 194 m g L -1 . Sublethal effects were observed with chlorpyrifos and metamidofos. The CE 50 values determined for disadherence at 24, 48 and 96 h respectively were chlorpyrifos 197.14, 89.14 and 36.23 m g L -1 , and metamidofos 600.81, 361.69 and 150.75 m g L -1 . The values for cephalic detachment at 24, 48 and 96 h of exposure respectively were chlorpyrifos 323.69, 109.02 and 60.01m g L -1 , and metamidofos 738.4, 314.4 and 155.93 m g L -1 . Of the three evaluated pesticides, the decreasing order of ecotoxicity for the lethal effects, at 24 h of exposure was chlorpyrifos > lindane > metamidofos; and at 48 h and 96 h was chlorpyrifos> metamidofos > lindane. For sub-lethal effects the decreasing order of ecotoxicity at 24, 48 and 96 h was chlorpyrifos > metamidofos. This protocol of ecotoxicological assays using P. venustula is proposed as a tool for the evaluation of environmental risks of soil pesticides.
URI: http://hdl.handle.net/1807/20637
Other Identifiers: http://www.bioline.org.br/abstract?id=at02021
Rights: Copyright 2002 - Instituto de Investigaciones Agropecuarias, INIA (Chile)
Appears in Collections:Bioline International Legacy Collection

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