Navegando por Autor "PINHEIRO, Beatriz Tavares"

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O efeito das espécies raras e comuns na diversidade funcional de aves florestais em uma paisagem dominada por palma-de-dendê na Amazônia Oriental
(Universidade Federal do Pará, 2024-03) PINHEIRO, Beatriz Tavares; ALMEIDA, Sara Miranda; http://lattes.cnpq.br/2785084573828283; HTTPS://ORCID.ORG/0000-0002-8372-5482; SANTOS, Marcos Pérsio Dantas; http://lattes.cnpq.br/7941154223198901; https://orcid.org/0000-0001-8819-867X
The advance of agro-industry in the Amazon is a major threat to biodiversity, causing intense deforestation to make way for cattle ranching and monocultures such as palm oil. Forest loss can alter the distribution and population size of rare species that are limited in number of individuals or area of occurrence, affecting the functional structure of communities and ecosystem services. In this study, we assessed the contribution of rare and common species to the functional diversity of forest bird communities in a landscape dominated by oil palm plantations. Bird sampling was conducted using a point count method in oil palm plantations and forest fragments in the eastern Amazon, Brazil. A total of 232 bird species was recorded, of which 198 occurred in the fragments and 53 in plantations. For each species occurring in forest fragments, we calculated a rarity index combining local abundance, geographic range and habitat specificity. We calculated functional richness (FRic), functional originality (FOri), functional specialization (FSpe) and community-weighted trait means (CWM), and compared them between forest and plantation communities considering three scenarios: 1) total pool of species recorded in forest versus plantation; 2) rarest species are removed from forest; and 3) more common species are removed from forest.There was a clear difference in trait composition between the two habitats. Removal of rare species increased functional diversity, but decreased functional redundancy. In contrast, the removal of common species reduced FOri and FSpe values, demonstrating that common forest bird species make unique functional contributions. We conclude that the loss of both rare and common species affects forest bird communities, and that it is essential to conserve and protect forested areas to ensure ecosystem health and resilience.