Arthropods biodiversity index bollgard cotton (Cry1Ac) in Brazil

Thomazoni Danielle, Ferreira Soria Miguel, Degrande Paulo Eduardo, Faccenda Odival, Silvie Pierre. 2013. Arthropods biodiversity index bollgard cotton (Cry1Ac) in Brazil. Interciencia, 38 (12) : 849-856.

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Titre espagnol : Indice de biodiversidad de artrópodos en algodón Bollgard (Crt1Ac) cultivado en la región de cerrado en Brasil / Titre portugais : Indice de biodiversidade de artrópodes em algodão Bollgard (Cry1Ac) no Brasil

Quartile : Q4, Sujet : ECOLOGY

Résumé : Shannon-Wiener's diversity index (SWI) was used under untreated conditions of a cotton field during the 2006/2007 crop season in the Cerrado region, Brazil. Comparison was carried out between the transgenic NuOpal® (Bollgard®)(Cry1Ac) and the non-transgenic isogenic variety DeltaOpal®. SWI was calculated for target pests, non-target herbivores and predators groups. Two sampling methods were used: whole plant observation and beat sheet. As expected, the mean number of target pests, especially Pectinophora gossypiella (Saund.) and Alabama argillacea (Hübner), was significantly smaller in Bt cotton. In the whole plant method sampling the SWI for non-target herbivores was significantly higher in Bt-cotton. The mean number of Anthonomus grandis (Boh.) and Edessa meditabunda (Fabr.) adults were significantly higher in NuOpal® with the whole plant sampling method. However, such differences were not observed with the beat sheet method. For the natural enemies, SWI and mean number of larvae and adults of the dominant predators did not show any significant difference between Bt and non-Bt cotton. These results confirm the conservation of some tritrophic interactions inside the Bt (untreated) cotton and contributes to a better sustainable management of nontarget pests by enhancement of their natural biological control.

Mots-clés Agrovoc : Gossypium, plante transgénique, évaluation de l'impact, impact sur l'environnement, biodiversité, herbivore, Arthropoda, prédateur, Pectinophora gossypiella, Alabama (lepidoptera), Anthonomus grandis, interactions biologiques, gestion des organismes nuisibles, lutte antiravageur, agriculture durable, dynamique des populations, indicateur, écologie animale