BROWN, G. G.

BUCH, A. C.

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247    The 9th International Symposium on Earthworm Ecology 5th to 10th September 2010, Xalapa, Mexico Poster – Session 7  Pontoscolex corethrurus (Müller, 1857) and Eisenia andrei, Bouché, 1972 as bioindicators of soil contaminated by pesticides  Cristhy Buch Andressa1, Brown George2  1Universidade Federal do Paraná 2Embrapa - Florestas  The indiscriminate and excessive use of pesticides has been constantly increasing due to the demand for greater agricultural production. This intense use of soil impacts the environment and soil biota. To indicate the extent to which these chemicals are harmful and how and where their effects occur, you can make use of ecotoxicological tests with earthworms. These animals are essential for the maintenance of chemical and biological processes in the soil and are useful to evaluate impacts of pesticides through behavioural, acute and chronic tests. Some of these tests were standardized by ISO (International standardization organization) using the earthworms Eisenia fetida and Eisenia andrei, both native to temperate climate. However, these species may be of little relevance for ecotoxicological seraphic studies, because they live in the soil litter (epigamic), and consume mainly fresh organic matter. The species Pontoscolex corethrurus, native to tropical regions, can be an alternative to an ecotoxicological most ecologically important species, because it is a true soil living organism and consume soil organic matter (endogeic). Little is known about their sensitivity to pesticides though. Therefore, in the present study, the sensitivity of E. andrei and P. corethrurus when exposed to three pesticides often used in fruit and grain in Brazil - carbendazim, carbofuran and glyphosate – were tested in a behavioural test ISO 17512-1, 2007 and an acute mortality test, ISO 11268-1, 1993. The results showed that carbendazim and carbofuran were toxic to both species. For carbendazin, E. andrei showed EC50 of 76.12 mg i.a. kg-1 and LC50 of 19.74 mg i.a. kg-1, while for P. corethrurus, EC50 of 65.81 and LC50 of 15.32 mg i.a. kg-1. For carbofuran, E. andrei showed EC50 of 9.74 and LC50 of 13.50 mg i.a. kg-1 while for P. corethrurus EC50 of 7.26 and LC50 of 9.28 mg i.a. kg-1. Glyphosate, on the other hand, showed no toxic effects at the tested concentrations for both species. The EC50 obtained for both species were very similar, 44.52 mg i.a. kg-1 for P. corethrurus, and 45.52 mg i.a. kg-1 for E. andrei. The sensitivity of P. corethrurus seems to be statistically similar when compared with the standard species E. andrei for the pesticides evaluated.           

Pontoscolex corethrurus (Müller, 1857) and Eisenia andrei, Bouché, 1972 as bioindicators of soil contaminated by pesticides.

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Pontoscolex corethrurus (Müller, 1857) and Eisenia andrei, Bouché, 1972 as bioindicators of soil contaminated by pesticides

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/868935/1/abstractsisee9p.247.pdf

Pontoscolex corethrurus (Müller, 1857) and Eisenia andrei, Bouché, 1972 as bioindicators of soil contaminated by pesticides

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