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Record information and status
Record ID
Date of creation
2012-05-08 17:57 UTC (dina.abdelhakim@cbd.int)
Date of last update
2012-05-31 15:34 UTC (dina.abdelhakim@cbd.int)
Date of publication
2012-05-31 15:34 UTC (dina.abdelhakim@cbd.int)

General Information
Comparing methods to evaluate the effects of Bt maize and insecticide on spider assemblages
Michael Meissle, Andreas Lang
Author’s contact information
Michael Meissle
E-mail: Michael.Meissle@fal.admin.ch

Agroscope FAL Reckenholz
Swiss Federal Research Station for Agroecology and Agriculture
Reckenholzstrasse 191, CH-8046 Zu¨rich, Switzerland

Tel.: +41 1 377 7573;
fax: +41 1 377 7201.
  • English
Publication date
Summary, abstract or table of contents

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.
Thematic areas
  • Scientific and technical issues
    • Risk assessment
Background material to the “Guidance on risk assessment of living modified organisms”
Is this document is recommend as background material for the “Guidance on Risk Assessment of Living Modified Organisms”
Section(s) of the “Guidance on Risk Assessment of Living Modified Organisms” this background material is relevant
Additional Information
Type of resource
  • Article (journal / magazine / newspaper)
Publisher and its location
© 2005 Elsevier B.V. All rights reserved.
12 page PDF
Agriculture Ecosystems and Environment
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