Título:	Spatio-temporal factors and environmental filters shaping Orthoptera communities in the Cerrado biome
Outros títulos:	Fatores espaço-temporais e filtros ambientais moldando comunidades de Orthoptera no bioma Cerrado
Autor(es):	Mello, Natália Diesel
Orientador(es):	Togni, Pedro Henrique Brum
Assunto:	Biomassa vegetal Gafanhoto Heterogeneidade ambiental Partição da diversidade Sazonalidade
Data de publicação:	24-Nov-2025
Data de defesa:	3-Abr-2024
Referência:	MELLO, Natália Diesel. Spatio-temporal factors and environmental filters shaping Orthoptera communities in the Cerrado biome. 2024. 96 f., il. Dissertação (Mestrado em Ecologia) — Universidade de Brasília, Brasília, 2024.
Abstract:	Unraveling the patterns of natural diversity and the processes and mechanisms determining them are central issues in Ecology research and conservation planning, particularly in the tropics, where diversity is high. This study aims to evaluate how Orthoptera communities are structured both locally and regionally, and partitioned across two vegetation types in the Cerrado biome (campo sujo and savanna) over three periods, in addition to identifying the environmental filters shaping these communities. To address our objective's questions, this dissertation was divided into two chapters. For this purpose, we sampled Orthoptera communities across the three periods (rainy season, transition from rainy to dry, and dry season), in two conservation units (UCs) in the Federal District, Brazil. In each UC, we selected three sample plots in savanna (cerrado sensu stricto) and grassland (cerrado campo sujo) areas, totaling six areas per UC. Orthopterans were sampled both actively (manually and using sweep nets) and passively (with pitfall traps). To understand the environmental filters shaping grasshopper assemblages, we also evaluated some environmental factors of the sample areas, such as vegetation structure (height, diversity, and coverage proportion of plant life forms), biomass availability over time, and local microclimatic conditions (temperature and relative humidity). We found Orthoptera communities with high diversity in the Cerrado, with many rare species and few abundant ones. Grassland areas showed higher Orthoptera abundances and species richness compared to savanna. This pattern was maintained across periods, and the highest adult abundances were observed during the dry season. The species composition of communities differed between vegetation types and also across seasons, suggesting high species turnover, as confirmed in the diversity partitioning analysis. The local scale was most important in determining Orthoptera diversity, and species replacement contributed most to the partitioning of beta diversity. Considering only grasshoppers (suborder Caelifera), we observed that above-ground biomass availability and biomass components (green and dry grasses and forbs) were the environmental factors with the largest effects on the abundance and species richness of assemblages. Microclimatic conditions also showed some effect, but only for maximum temperatures and average relative humidity, with small effect magnitudes. In other words, Orthoptera communities in savanna and grassland areas of the Cerrado are species-rich and have their diversity components strongly associated with the vegetation structure of their habitats, mainly influenced by the availability of plant resources.
Unidade Acadêmica:	Instituto de Ciências Biológicas (IB)
Informações adicionais:	Dissertação (mestrado) — Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Ecologia, 2024.
Programa de pós-graduação:	Programa de Pós-Graduação em Ecologia
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.unb.br, www.ibict.br, www.ndltd.org sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra supracitada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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