Título:	Escalonando a ecologia de coccinelídeos : determinantes em múltiplas escalas do uso do habitat, das interações tróficas e do controle biológico em agroecossistemas orgânicos
Outros títulos:	Scaling up coccinellid ecology : multiscale drivers of coccinellid habitat use, trophic interactions, and biological control in organic agroecosystems
Autor(es):	Silva, Ana Cláudia da
Orientador(es):	Togni, Pedro Henrique Brum
Assunto:	Cerrados Controle biológico conservativo DNA metabarcoding Redes ecológicas Serviços ecossistêmicos Paisagem Isótopos estáveis
Data de publicação:	26-Jun-2026
Data de defesa:	16-Dez-2025
Referência:	SILVA, Ana Cláudia da. Escalonando a ecologia de coccinelídeos : determinantes em múltiplas escalas do uso do habitat, das interações tróficas e do controle biológico em agroecossistemas orgânicos. 2025. 134 f., il. Tese (Doutorado em Ecologia) — Universidade de Brasília, Brasília, 2025.
Abstract:	Agricultural intensification drives global biodiversity loss, directly impacting essential biological control services in tropical agroecosystems. Within this context, aphidophagous coccinellids, a key group of natural enemies, are significantly affected by drivers operating at multiple spatial scales, for instance, benefiting from local floral resources and landscape-scale semi-natural habitats. Therefore, one main challenge is to unravel the mechanisms driving these patterns across scales, particularly concerning trophic interactions and species coexistence, as they directly influence the structure of natural enemy communities and, consequently, the provision of biological control services. This thesis investigated how biotic and abiotic factors across spatial scales enable or constrain coexistence among predatory coccinellid species in organic agroecosystems. To achieve this, this thesis was divided into three chapters. Chapter 1 analyzes how coccinellid species spatially partition habitat and microhabitat in organic brassica crops, niche overlap across life stages, and the influence of adjacent non-crop plants habitats on coccinellids abundance. Chapter 2 evaluates how trophic interactions and trophic positions of species vary with prey availability, emphasizing the role of non-crop plants species. Chapter 3 investigates how landscape composition influences coccinellid communities, their trophic interactions with plants and aphids, and the resulting aphid biological control across different scales. I found stage-specific spatial segregation among coccinellid species, with competitively superior species dominating crop plants during their mobile life stages (larvae and adults) and pupating more frequently in sheltered sites outside the plants. Conversely, inferior competitors persisted by utilizing non-crop plants, which promoted coexistence through spatial segregation. Furthermore, coccinellid abundance correlated with aphid density, yet non-crop plants sustained communities during prey scarcity. Aphid density modulated species isotopic niche size/overlap and the overall trophic network structure. Moreover, high diversity of non-crop plants supplied coccinellid species with resources (e.g., pollen and nectar), enabling them to shift from a plant-based to an animal-based diet based on prey availability. The plant–aphid–coccinellid network was highly connected, with numerous direct plant–coccinellid interactions, reflecting the generalist feeding behavior of coccinellids and highlighting the role of non-crop plants in supporting key interactions. Landscape composition affected aphid density, coccinellid abundance, diversity, and their tritrophic interactions across scales, influencing biological control service provision. Overall, landscape composition is a critical predictor of diversity and abundance of coccinellids but also influences how species from the regional pool structure their interactions locally. This structure is sustained by non-crop plants, which serve as essential food resources, jointly explaining trophic variation and energy transfer, although outcomes are modulated by species-specific differences in life histories, functional traits, and behavior of species.
Unidade Acadêmica:	Instituto de Ciências Biológicas (IB)
Informações adicionais:	Tese (doutorado) — Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Ecologia, 2025.
Programa de pós-graduação:	Programa de Pós-Graduação em Ecologia
Agência financiadora:	Fundação de Apoio à Pesquisa do Distrito Federal (FAPDF) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) e Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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