Predation by ground beetles and wolf spiders on herbivorous insects in a maize crop

Lang, Andréas; Filser, Juliane; Henschel, Joh R.

doi:10.1016/s0167-8809(98)00186-8

Cited by 110 publications

(76 citation statements)

References 29 publications

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“…1), mostrou que quando apenas os inimigos naturais presentes nas folhas de couve foram considerados na análise, o modelo obtido apresentou uma única variável significativa, isto é, D. rapae, que explicou apenas 22,2% da variação observada na densidade populacional de B. brassicae (Tabela 2). Esses resultados confirmam observações de outros autores (Askari & Alishah 1979, Souza & Bueno 1992 Riechert & Lockley (1984) e Lang et al (1999).…”

Section: Resultsunclassified

Impacto de inimigos naturais e de fatores meteorológicos sobre uma população de Brevicoryne brassicae (L.) (Hemiptera: Aphididae) em couve

Cividanes¹

2002

Neotrop. Entomol.

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-The dynamics of a population of the cabbage aphid, Brevicoryne brassicae (L.), was studied to estimate the impact of natural enemies and meteorological factors using simple correlation and stepwise regression. Apterous B. brassicae were sampled by visual search, and natural enemies by suction net and pitfall traps. The aphids began to infest kale in July, reaching peak population in September. The factors Diaeretiella rapae (Mc'Intosh), ground spiders, rainfall and relative humidity showed significant correlation with B. brassicae population, in the period that embraced the whole population survey, which suggests that these factors had an important function in the mortality of the aphid. During the period of highest increase and decline of the population of B. brassicae, ground spiders constituted the most significant mortality factor related with the variation of the population density of the aphid.KEY WORDS: Insecta, population dynamics, predator, parasitoid, Brassica oleracea.RESUMO -Neste estudo, visou-se avaliar o impacto de inimigos naturais e de fatores meteorológicos na população do pulgão Brevicoryne brassicae (L.), na cultura da couve, usando-se correlação simples e análise de regressão múltipla com seleção de variáveis pelo método stepwise. A amostragem de B. brassicae foi realizada por procura visual e dos inimigos naturais através de armadilhas de sucção e de solo. Formas ápteras de B. brassicae começaram a infestar a couve em julho, atingindo pico populacional em setembro. Os fatores que apresentaram correlação significativa com a população de B. brassicae, no período que abrangeu todo o levantamento populacional, foram Diaeretiella rapae (Mc'Intosh), aranhas presentes no solo, precipitação pluviométrica e umidade relativa, sugerindo que tais fatores tiveram função importante na mortalidade do pulgão. No período de maior crescimento e declínio populacional de B. brassicae, aranhas presentes no solo mostraram-se como o fator de mortalidade mais significativo relacionado com a variação da densidade populacional do pulgão. PALAVRAS-CHAVE: Insecta, dinâmica populacional, predador, parasitóide, Brassica oleracea.O pulgão da couve, Brevicoryne brassicae (L.), encontrase amplamente distribuído nas regiões temperadas e subtropicais do mundo, e pelo menos 101 espécies de plantas são comprovadamente suas hospedeiras. Na

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Section: Resultsunclassified

Impacto de inimigos naturais e de fatores meteorológicos sobre uma população de Brevicoryne brassicae (L.) (Hemiptera: Aphididae) em couve

Cividanes¹

2002

Neotrop. Entomol.

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“…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%

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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“…Beetles generally showed positive effects of land-cover diversity (Tables 1 and 3), possibly reflecting landscape complementarity [5] in the use of pulsed prey resources in agricultural habitats [59,60] and the use of alternative prey, floral resources, or overwintering sites in semi-natural habitats [15,23]. Bees also showed a positive response to land-cover diversity, with large, solitary and small, social bee functional groups responding to two different scales of land-cover diversity.…”

Section: Discussionmentioning

confidence: 99%

Landscape and Local Controls of Insect Biodiversity in Conservation Grasslands: Implications for the Conservation of Ecosystem Service Providers in Agricultural Environments

Crist

Peters

2014

Land

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Abstract:The conservation of biodiversity in intensively managed agricultural landscapes depends on the amount and spatial arrangement of cultivated and natural lands. Conservation incentives that create semi-natural grasslands may increase the biodiversity of beneficial insects and their associated ecosystem services, such as pollination and the regulation of insect pests, but the effectiveness of these incentives for insect conservation are poorly known, especially in North America. We studied the variation in species richness, composition, and functional-group abundances of bees and predatory beetles in conservation grasslands surrounded by intensively managed agriculture in Southwest Ohio, USA. Characteristics of grassland patches and surrounding land-cover types were used to predict insect species richness, composition, and functional-group abundance using linear models and multivariate ordinations. Bee species richness was positively influenced by forb cover and beetle richness was positively related to grass cover; both taxa had greater richness in grasslands surrounded by larger amounts of semi-natural land cover. Functional groups of bees and predatory beetles defined by body size and sociality varied in their abundance according to differences in plant composition of grassland patches, as well as the surrounding land-cover diversity. Intensive agriculture in the surrounding landscape acted as a filter to both bee and beetle species composition in conservation grasslands. Our results support the need for management incentives to consider landscape-level processes in the conservation of biodiversity and ecosystem services.

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Predation by ground beetles and wolf spiders on herbivorous insects in a maize crop

Cited by 110 publications

References 29 publications

Impacto de inimigos naturais e de fatores meteorológicos sobre uma população de Brevicoryne brassicae (L.) (Hemiptera: Aphididae) em couve

Impacto de inimigos naturais e de fatores meteorológicos sobre uma população de Brevicoryne brassicae (L.) (Hemiptera: Aphididae) em couve

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

Landscape and Local Controls of Insect Biodiversity in Conservation Grasslands: Implications for the Conservation of Ecosystem Service Providers in Agricultural Environments

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