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Resumo. O presente estudo teve como objetivos avaliar a resposta funcional dos instares larvais e adultos de tres especies de coccinelideos predadores [ Harmonia axyridis (Pallas), Cycloneda sanguinea (Linnaeus) e Hippodamia convergens Guerin Meneville] em diferentes densidades de Brevicoryne brassicae (Linnaeus), comparando o desempenho da especie invasora com as especies locais. Observou-se que H. axyridis consumiu mais insetos que as outras especies; o numero de pulgoes predados pelas tres especies de coccinelideos aumentou com a troca do instares larvais e, que as femeas tenderam a predar mais pulgoes que os machos. A voracidade das larvas de 4o instar e similar a dos adultos, as vezes ate maior, como no caso da C. sanguinea . Exceto no 1o instar larval, todos os outros estagios de vida mostraram aumento do consumo de pulgoes a medida que a oferta de presas aumenta. Os resultados mostraram que a resposta funcional do tipo III foi indicada apenas pelas larvas de 3o instar de H. axyridis e nas demais especies e estagios avaliados a resposta funcional foi do tipo II. Em geral H. axyridis apresentou assintotas das respostas funcionais mais elevadas em comparacao com as especies anteriormente estabelecidas. Entretanto, a diferenca entre a magnitude das curvas de respostas funcionais entre a invasora e as especies locais nao e muito acentuada, o que pode indicar pouco impacto da invasora sobre a populacao de recursos no campo e, uma tendencia a adaptacao e estabilizacao entre estas especies da comunidade intraguilda. Functional response compared between Harmonia axyridis (Pallas), Cycloneda sanguinea (Linnaeus) and Hippodamia convergens Guerin Meneville (Coleoptera: Coccinellidae) fed on Brevicoryne brassicae (Linnaeus) (Hemiptera: Aphididae) Abstract. The study evaluated the functional response of larval instars and adult of three species of coccinellids predator [ Harmonia axyridis (Pallas), Cycloneda sanguinea (Linnaeus) and Hippodamia convergens Guerin Meneville] in different densities of Brevicoryne brassicae (Linnaeus), comparing the performance of the invasive species with the local species. It was observed that H. axyridis consumed more insects than the other species; the number of aphids preyed by the three species of coccinellids increased with the exchange of larval instars and that females tended to prey more aphids than males. The voracity of the 4th instar larvae is similar to that of adults, sometimes even larger, as in the case of C. sanguinea . Except for the first larval instar, all other stages of life have shown increased aphid consumption as the supply of prey increases. The results showed that the functional response of type III was indicated only by the 3rd instar larvae of H. axyridis and in the other species and stages evaluated the functional response was type II. In general H. axyridis presented asymptotes of the highest functional responses in comparison to the previously established species. However, the difference between the magnitude of the functional response curves between the invasive and the local species is not very pronounced, which may indicate little impact of the invasive on the population of resources in the field and a tendency to adaptation and stabilization between these species of the intraguild community.

entomobrasilis

Resposta funcional comparada entre Harmonia axyridis (Pallas), Cycloneda sanguinea (Linnaeus) e Hippodamia convergens Guerin Meneville (Coleoptera: Coccinellidae) alimentadas com Brevicoryne brassicae (Linnaeus) (Hemiptera: Aphididae)