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Biosafety Virtual Library Resources
(VLR)
published: 08 May 2012
last updated: 31 May 2012
Comparing methods to evaluate the effects of Bt maize and insecticide on spider assemblages
EN
Elsevier
EN
2005
EN
Agriculture Ecosystems and Environment
EN
© 2005 Elsevier B.V. All rights reserved.
EN
Abstract:
In a field study, potential adverse effects of Bt maize on plant-dwelling spiders (Araneae) were assessed in 2001 in Bavaria, South Germany. Spider assemblages were recorded in Bt maize fields and conventional maize fields, with and without (pyrethroid) insecticide application. In addition, the efficacy of several sampling techniques to collect plant-dwelling spiders was tested (beating sheets, suction sampling, plant removal, stem eclectors). A total of 29 species and 14 families were identified. Juvenile spiders of the families Theridiidae, Linyphiidae, Tetragnathidae and Araneidae dominated the catch. The sampling methods differed in their capture efficiency with regard to abundance, family composition, species richness and power to detect effects. Suction samplers performed best, and are recommended for monitoring plant-dwelling spiders in maize. Bt maize had no substantial effects on species richness and abundance of spiders, whereas insecticide application reduced spider densities.
EN
In a field study, potential adverse effects of Bt maize on plant-dwelling spiders (Araneae) were assessed in 2001 in Bavaria, South Germany. Spider assemblages were recorded in Bt maize fields and conventional maize fields, with and without (pyrethroid) insecticide application. In addition, the efficacy of several sampling techniques to collect plant-dwelling spiders was tested (beating sheets, suction sampling, plant removal, stem eclectors). A total of 29 species and 14 families were identified. Juvenile spiders of the families Theridiidae, Linyphiidae, Tetragnathidae and Araneidae dominated the catch. The sampling methods differed in their capture efficiency with regard to abundance, family composition, species richness and power to detect effects. Suction samplers performed best, and are recommended for monitoring plant-dwelling spiders in maize. Bt maize had no substantial effects on species richness and abundance of spiders, whereas insecticide application reduced spider densities.
- GBF-T17. Strengthen biosafety and distribute benefits of biotechnology
No
No
No
Identifier (ISBN, ISSN, etc.)
doi:10.1016/j.agee.2004.12.007
Format
12 page PDF
Keywords and any other relevant information
Keywords: Araneae; Bacillus thuringiensis; General surveillance; Non-target arthropods; Pyrethroid; Risk assessment; Sampling techniques; Transgenic crop
Citation: Agriculture, Ecosystems and Environment 107 (2005) 359–370
