Impact of farm-scale Bt maize on abundance of predatory arthropods in Spain

Poza, Marta de la; Pons, Xavier; Farinós, Gema P.; López, Carmen; Ortego, Félix; Eizaguirre, Matilde; Castañera, Pedro; Albajes, R.

doi:10.1016/j.cropro.2004.12.003

Cited by 98 publications

(75 citation statements)

References 32 publications

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“…Potential impacts of Bt maize on the environment to be considered included those for non-target arthropods (NTAs), an important component of agro-ecosystems formed by non-target herbivores and pests' natural enemies, among other functional groups (Asín & Pons, 1998;Albajes et al, 2003;de la Poza et al, 2005;Farinós et al, 2008;Lumbierres et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…In pitfall trapping two families, Carabidae and Staphylinidae, and two orders, Dermaptera and Araneae, were recorded. These predatory groups were selected according to the abundance and potential effects recorded in previous field trials (Lang et al, 1999;Albajes et al, 2003;Jasinski et al, 2003;de la Poza et al, 2005;Farinós et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Post-market environmental monitoring of Bt maize in Spain: Non-target effects of varieties derived from the event MON810 on predatory fauna

Albajes

Farinós

Pérez‐Hedo

et al. 2012

Span. j. agric. res.

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The Spanish Government has established post-market environmental monitoring (PMEM) as mandatory for genetically modified (GM) crop varieties cultivated in Spain. In order to comply with this regulation, effects of Bt maize varieties derived from the event MON810 on the predatory fauna were monitored for two years in northeast and central Spain. The study was carried out with a randomized block design in maize fields of 3-4 ha on which the abundance of plant-dwelling predators and the activity-density of soil-dwelling predators in Bt vs. non-Bt near-isogenic varieties were compared. To this end, the plots were sampled by visual inspection of a certain number of plants and pitfall traps 6 or 7 times throughout two seasons. No significant differences in predator densities on plants were found between Bt and non-Bt varieties. In the pitfall traps, significant differences between the two types of maize were found only in Staphylinidae, in which trap catches in non-Bt maize were higher than in Bt maize in central Spain. Based on the statistical power of the assays, surrogate arthropods for PMEM purposes are proposed; Orius spp. and Araneae for visual sampling and Carabidae, Araneae, and Staphylinidae for pitfall trapping. The other predator groups recorded in the study, Nabis sp. and Coccinellidae in visual sampling and Dermaptera in pitfall trapping, gave very poor power results. To help to establish a standardized protocol for PMEM of genetically modified crops, the effect-detecting capacity with a power of 0.8 of each predator group is given.Additional key words: GMO; non-target arthropods; Orius spp.; Staphylinidae; Carabidae; PMEM; statistical power. Resumen Plan de Seguimiento del cultivo de maíz Bt en España: evaluación de los efectos de variedades con el evento MON810 sobre entomofauna no dianaCon el objetivo de cumplir con la legislación española que establece la obligatoriedad de un plan de seguimiento ambiental para post-comercialización (PMEM) para los cultivos modificados genéticamente, se evaluó durante dos años el efecto de variedades de maíz Bt derivadas del evento MON810 en la fauna depredadora, en el nordeste y centro de España. El estudio se realizó mediante un diseño de bloques al azar, en campos de maíz de 3-4 ha, en los cuales se comparó la abundancia/actividad de depredadores en planta y en el suelo entre variedades de maíz Bt y no-Bt. Las parcelas se muestrearon de 6 a 7 veces durante cada uno de los dos años mediante inspección visual de un número determinado de plantas y por medio de trampas de gravedad. No se observaron en general diferencias significativas en la densidad de depredadores en planta y en el suelo entre las variedades Bt y no-Bt y sólo los Staphylinidae mostraron capturas significativamente mayores en parcelas no Bt en el centro de España. En base a la potencia estadística obtenida de los análisis se proponen una serie de artrópodos indicadores para los ensayos de PMEM: Orius spp. y Araneae

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post-market environmental monitoring of Bt maize in Spain: Non-target effects of varieties derived from the event MON810 on predatory fauna

Albajes

Farinós

Pérez‐Hedo

et al. 2012

Span. j. agric. res.

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“…Experiments that included broad spectrum insecticides, such as pyrethroids and organophosphates, have shown consistently reduced abundances of different groups of predators and hymenopteran parasitoids (Bt-maize [47][48][49]; Bt-cotton [42,43,[50][51][52][53]). Side effects of more selective insecticides such as indoxacarb (anoxadiazine) or spinosad (amacrolide) largely depended on the spray frequency [49] whereas systemic insecticides (such as imidacloprid, a neonicotinoid) were found to have no or little effect on natural enemies [54]. Although some of the field studies were limited in their spatial scale, and lack statistical power due to limited replication and high variability in the data, they clearly indicated that non-target effects of Bt-crops were substantially lower than those of broad spectrum insecticides.…”

Section: Higher-tier Studies In the Fieldmentioning

confidence: 99%

Ecological Impacts of Genetically Modified Crops: Ten Years of Field Research and Commercial Cultivation

Sanvido

Romeis

Bigler

Green Gene Technology

110

102

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“…Within the predatory arthropods, spiders are common, abundant, and diverse in agroecosystems (Lundgren & Fergen, 2010;Lundgren et al, 2006;Nyffeler & Sunderland, 2003;Young & Edwards, 1990), including Bt crop fields (Duan et al, 2004;de la Poza et al, 2005;Sisterson et al, 2004). In addition to playing varied and essential roles in arthropod food webs (Wise, 1993), these generalist predators can be key predators of pests in crop fields (Greenstone, 1999;Harwood et al, 2004;Riechert & Lockley, 1984).…”

Section: Introductionmentioning

confidence: 99%

Spiders from multiple functional guilds are exposed to Bt-endotoxins in transgenic corn fields via prey and pollen consumption

Peterson

Obrycki

Harwood

2016

Biocontrol Science and Technology

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A comprehensive assessment of risk to natural enemies from Bt-endotoxins from bioengineered crops must evaluate potential harm, as well as exposure pathways in non-target arthropod food webs. Despite being abundant generalist predators in agricultural fields, spiders (Araneae) have often been overlooked in the context of Bt crop risk assessment. Spiders and their prey were collected from transgenic corn fields expressing lepidopteran-specific Cry1Ab, coleopteran-specific Cry3Bb1, both proteins, and a non-transgenic near isoline. Spiders and prey were screened for Cry1Ab and Cry3Bb1 using qualitative enzyme-linked immunosorbent assay. Spiders from the three most common functional guilds, wandering sheet-tangle weavers, orb-weavers, and ground runners, tested positive for Cry1Ab and Cry3Bb1 proteins, with the highest per cent positive (8.0% and 8.3%) during and after anthesis. Laboratory feeding trials revealed that Bt-endotoxins were detectable in the Pardosa sp. (Lycosidae)-immature cricket-Bt corn pathway, but not in the Tennesseellum formica (Linyphiidae)-Collembola-Bt corn pathway. Additionally, direct consumption of transgenic corn pollen by Pardosa sp., T. formica, and Cyclosa turbinata (Araneidae) resulted in transfer of both Cry1Ab and Cry3Bb1 endotoxins. This study demonstrates that Bt-endotoxins are taken up by diverse members of a spider community via pollen and prey consumption and should be factored into future risk assessment.

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Impact of farm-scale Bt maize on abundance of predatory arthropods in Spain

Cited by 98 publications

References 32 publications

Post-market environmental monitoring of Bt maize in Spain: Non-target effects of varieties derived from the event MON810 on predatory fauna

Post-market environmental monitoring of Bt maize in Spain: Non-target effects of varieties derived from the event MON810 on predatory fauna

Ecological Impacts of Genetically Modified Crops: Ten Years of Field Research and Commercial Cultivation

Spiders from multiple functional guilds are exposed to Bt-endotoxins in transgenic corn fields via prey and pollen consumption

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