Usos múltiplos da paisagem amazônica e a comunidade de escarabeíneos

• Ano de defesa: 2011
• Autor(a) principal: Oliveira, Victor Hugo Fonseca
• Orientador(a): Louzada, Júlio Neil Cassa
• Banca de defesa: Ribas, Carla Rodrigues, Neves, Frederico Siqueira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DBI - Departamento de Biologia
• País: BRASIL
• Palavras-chave em Português: Valor de conservação; Floresta secundária; Bioindicação; Florestas tropicais; Rola-bosta; Conservation value; Secondary forest; Bioindication; Tropical forest; Dung beetle
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/3531

The Amazon Rainforest is the biggest and one of the most important forests of the world. Its boundaries extend across nine countries, and its biggest area is located in Brazil. In the last years, the deforestation, degradation and fragmentation rates of the Amazon increased considerably, generating highly heterogeneous landscapes. Therefore, it is important to study these landscapes for a better understanding of their conservation value. This work aimed at investigating the differences among primary forest, secondary forest, pasture and agriculture land-use types, in Amazon region, using Scarabaeinae subfamily beetles as biological indicators. Furthermore, we observed the effect of occasional species in the conservation value measure of these land-uses. This study was carried out in Santarem micro-region, in the state of Pará, Brazil. Transects were distributed along the predominant land-uses, within 18 predetermined micro-watersheds. Dung beetles were collected through pitfall traps baited with dung (20% human dung, 80% pig dung). The richness, abundance and evenness values of the dung beetles communities decreased with land-use intensification. Communities were clear separated in ´forested´ and ´non-forested´ land-uses, regarding to structure. There were significant differences between primary and secondary forest, unlike pasture and agriculture. The secondary forest presented high conservation value, but was strongly influenced by landscape context. Pasture and agriculture showed low conservation values, due to the minimal sharing of species among these land-use types and the primary forest. The removal of occasional species decreased the conservation value of anthropogenic land-uses. Our findings show the dung beetles are strongly influenced by the presence/absence of forest cover, rather than by the land-use type itself. Despite the importance of secondary forest, this work highlights the primary forest uniqueness. More, we show that we need to have caution before making decisions based in secondary forest diversity. Finally, it is proposed to conservationists consider the influence of occasional species in their results.