Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina
Bt crops were incorporated in South America more than 20 years ago and their use has increased sharply since then. However, the potential negative environmental effects are still a concern, specifically, the impacts on nontarget arthropod species. The objective of this work was to determine if the e...
| Autores principales: | , , |
|---|---|
| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Ediciones INTA
2024
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/20503 https://doi.org/10.58149/ffkj-7a42 |
| _version_ | 1855486583624433664 |
|---|---|
| author | Guillot Giraudo, Walter Figueruelo, Andrea Mariana Trumper, Eduardo Victor |
| author_browse | Figueruelo, Andrea Mariana Guillot Giraudo, Walter Trumper, Eduardo Victor |
| author_facet | Guillot Giraudo, Walter Figueruelo, Andrea Mariana Trumper, Eduardo Victor |
| author_sort | Guillot Giraudo, Walter |
| collection | INTA Digital |
| description | Bt crops were incorporated in South America more than 20 years ago and their use has increased sharply since then. However, the potential negative environmental effects are still a concern, specifically, the impacts on nontarget arthropod species. The objective of this work was to determine if the effects of Bt soybean are limited to the removal of the larvae of target Lepidoptera species or if they also indirectly affect the arthropod community. Bt soybean expressing Cry1Ac toxin and non-Bt soybean were planted under the same environmental and agricultural conditions at two planting dates (early and late planting dates). None of the cultivars received insecticide applications. The abundance of phytophagous insects and predatory arthropods was recorded in each treatment (cultivar × planting date). Moreover, the larvae Lepidopteran, stink bugs and eggs of both groups were collected and maintained under controlled rearing conditions to record parasitoids. The diversity of the arthropod assemblage, as well as that of the phytophagous and entomophagous subassemblages of each treatment, and the similarities between them were estimated with and without the presence of target species and their parasitoids. The range-abundance curves were plotted following the same criteria. The diversity was higher in the non-Bt cultivar than in the Bt one. No clear effects of planting date were detected. A high similarity was found among treatments. Our results show that the removal of the target species larvae and their specific parasitoids is sufficient to explain the effect of the Bt soybean on the richness and diversity of the arthropod assemblage as well as those of the phytophagous and entomophagous subassemblages, with no evidence of additional indirect effects on biodiversity. |
| format | Artículo |
| id | INTA20503 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Ediciones INTA |
| publisherStr | Ediciones INTA |
| record_format | dspace |
| spelling | INTA205032024-12-06T12:29:57Z Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina Guillot Giraudo, Walter Figueruelo, Andrea Mariana Trumper, Eduardo Victor Soja Biodiversidad Parasitoides La Pampa Soybeans Biodiversity Arthropoda Parasitoids Artrópodos Arthropods Bt crops were incorporated in South America more than 20 years ago and their use has increased sharply since then. However, the potential negative environmental effects are still a concern, specifically, the impacts on nontarget arthropod species. The objective of this work was to determine if the effects of Bt soybean are limited to the removal of the larvae of target Lepidoptera species or if they also indirectly affect the arthropod community. Bt soybean expressing Cry1Ac toxin and non-Bt soybean were planted under the same environmental and agricultural conditions at two planting dates (early and late planting dates). None of the cultivars received insecticide applications. The abundance of phytophagous insects and predatory arthropods was recorded in each treatment (cultivar × planting date). Moreover, the larvae Lepidopteran, stink bugs and eggs of both groups were collected and maintained under controlled rearing conditions to record parasitoids. The diversity of the arthropod assemblage, as well as that of the phytophagous and entomophagous subassemblages of each treatment, and the similarities between them were estimated with and without the presence of target species and their parasitoids. The range-abundance curves were plotted following the same criteria. The diversity was higher in the non-Bt cultivar than in the Bt one. No clear effects of planting date were detected. A high similarity was found among treatments. Our results show that the removal of the target species larvae and their specific parasitoids is sufficient to explain the effect of the Bt soybean on the richness and diversity of the arthropod assemblage as well as those of the phytophagous and entomophagous subassemblages, with no evidence of additional indirect effects on biodiversity. Los cultivos Bt se incorporaron ampliamente en los sistemas productivos de América del Sur siguiendo una pronunciada curva de adopción iniciada hace más de 20 años. Sin embargo, los posibles efectos ambientales negativos siguen siendo una preocupación, específicamente, los impactos sobre las especies de artrópodos no blanco. El objetivo de este trabajo fue determinar si los efectos de la soja Bt se limitan a la remoción de larvas de las especies lepidópteras blanco de la toxina o presentan efectos indirectos sobre la comunidad de artrópodos. Se sembraron sojas Bt (que expresan la toxina Cry1Ac) y no Bt bajo las mismas condiciones ambientales y agrícolas en dos fechas de siembra (fecha de siembra temprana y fecha de siembra tardía). El ensayo se mantuvo sin aplicaciones de insecticidas. Se registró la abundancia de insectos fitófagos y de artrópodos predadores en cada tratamiento (variedad × fecha de siembra). Además, se colectaron larvas de lepidópteros, chinches fitófagas y huevos de ambos grupos. Los individuos y huevos recolectados se mantuvieron bajo condiciones controladas con el fin de obtener y registrar parasitoides. Se estimó la diversidad y similitud y se trazaron las curvas rango-abundancia para el ensamble de artrópodos y los subensambles de insectos fitófagos y artrópodos entomófagos con y sin presencia de especies blanco y sus parasitoides. La diversidad resultó alta en la variedad no Bt. No se detectaron efectos claros de la fecha de siembra. Se encontró una similitud elevada entre los tratamientos para los ensambles y subensambles. Nuestros resultados muestran que los efectos de la variedad Bt sobre la comunidad de artrópodos de soja se debe a la eliminación de las larvas de especies blanco de la toxina y sus parasitoides específicos, sin evidencias de efectos indirectos adicionales sobre la biodiversidad. EEA Anguil Fil: Guillot Giraudo, Walter. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Anguil; Argentina Fil: Guillot Giraudo, Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Figueruelo, Andrea Mariana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Anguil; Argentina Fil: Figueruelo, Andrea Mariana. Universidad Nacional de La Pampa. Facultad de Agronomía; Argentina Fil: Trumper, Eduardo V. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina Fil: Trumper, Eduardo V. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina 2024-12-06T12:26:27Z 2024-12-06T12:26:27Z 2024-11 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/20503 0325-8718 1669-2314 https://doi.org/10.58149/ffkj-7a42 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Ediciones INTA RIA 50 (3) : 112-129. (diciembre 2024) |
| spellingShingle | Soja Biodiversidad Parasitoides La Pampa Soybeans Biodiversity Arthropoda Parasitoids Artrópodos Arthropods Guillot Giraudo, Walter Figueruelo, Andrea Mariana Trumper, Eduardo Victor Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title | Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title_full | Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title_fullStr | Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title_full_unstemmed | Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title_short | Effects of Bt soybean on biodiversity are limited to target species and host-specific parasitoids in La Pampa province, Argentina |
| title_sort | effects of bt soybean on biodiversity are limited to target species and host specific parasitoids in la pampa province argentina |
| topic | Soja Biodiversidad Parasitoides La Pampa Soybeans Biodiversity Arthropoda Parasitoids Artrópodos Arthropods |
| url | http://hdl.handle.net/20.500.12123/20503 https://doi.org/10.58149/ffkj-7a42 |
| work_keys_str_mv | AT guillotgiraudowalter effectsofbtsoybeanonbiodiversityarelimitedtotargetspeciesandhostspecificparasitoidsinlapampaprovinceargentina AT figuerueloandreamariana effectsofbtsoybeanonbiodiversityarelimitedtotargetspeciesandhostspecificparasitoidsinlapampaprovinceargentina AT trumpereduardovictor effectsofbtsoybeanonbiodiversityarelimitedtotargetspeciesandhostspecificparasitoidsinlapampaprovinceargentina |