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Titolo:
DOES A HETEROGENEOUS DISTRIBUTION OF FOOD OR PESTICIDE AFFECT THE OUTCOME OF TOXICITY TESTS WITH COLLEMBOLA
Autore:
KROGH PH;
Indirizzi:
NATL ENVIRONM RES INST,DEPT TERR ECOL DK-8600 SILKEBORG DENMARK
Titolo Testata:
Ecotoxicology and environmental safety
fascicolo: 2, volume: 30, anno: 1995,
pagine: 158 - 163
SICI:
0147-6513(1995)30:2<158:DAHDOF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
WINTER-WHEAT; DIMETHOATE; REPRODUCTION; BENOMYL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
P.H. Krogh, "DOES A HETEROGENEOUS DISTRIBUTION OF FOOD OR PESTICIDE AFFECT THE OUTCOME OF TOXICITY TESTS WITH COLLEMBOLA", Ecotoxicology and environmental safety, 30(2), 1995, pp. 158-163

Abstract

The reproduction of two closely related soil microarthropods, Folsomia candida Willem and Folsomia fimetaria L. (Insecta: Collembola), was tested under the influence of the insecticide dimethoate. Dimethoate had an adverse effect on the survival of adults and their reproduction in concentrations of about the recommended field dose, with F. fimetaria being more sensitive than F. candida. The experimental conditions were altered to evaluate the realism in the basic single species/singlechemical reproductive test system. The importance of the spatial distribution of dimethoate was studied with food applied to the surface (original procedure), mixed homogeneously in the whole soil profile or only in the top layer, or mixed heterogeneously into the soil preserving the small granula of the yeast originally in the commercial formulation. Toxicity decreased significantly when exposure could be avoided in an uncontaminated bottom layer and even more if food was available in this soil horizon. But the results indicate that Collembola were notable to completely avoid dimethoate when they had the choice. For extrapolation purposes a simple test system may be sufficient as EC(50) was changed less than one order of magnitude with the different test designs. In terms of EC(50) the outcome of a toxicity test with a heterogeneous distribution of food and dimethoate was changed only slightly but the effects to suboptimally fed populations should be considered because they may be more vulnerable. (C) 1995 Academic Press, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 04:50:42