Mendes, Liana de FigueiredoSilva, André Alves Reis2025-08-142025-08-142025-03-20SILVA, André Alves Reis. Comportamento e padrões de uso em praias por aves marinhas em uma ilha oceânica brasileira. Orientadora: Dra. Liana de Figueiredo Mendes. 2025. 68f. Dissertação (Mestrado em Ecologia) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2025.https://repositorio.ufrn.br/handle/123456789/65143Seabirds, as top predators in the food chain, have a wide global distribution and behavioral flexibility, adjusting their foraging strategies according to abiotic factors and prey availability. In Brazil, oceanic islands such as the Fernando de Noronha Archipelago are important areas for breeding, resting, and feeding. Noronha stands out for its biodiversity, hosting species such as the magnificent frigatebird (Fregata magnificens), boobies (Sula spp.), and noddies (Anous spp.). In the first chapter, we evaluated the composition of the seabird community in flight on the main island, considering time of day (7h, 9h, 11h, 15h, and 17h), seasonality (rainy and dry seasons), and spatiality (inner sea and outer sea). We identified higher diversity during the dry season, especially in the outer sea in the morning and under conditions of no swell. The inner sea showed greater variability between morning and afternoon, highlighting seasonal differences. In the second chapter, we investigated the behavior of the brown booby (Sula leucogaster) in Fernando de Noronha, considering spatial, diurnal, and seasonal variations. Using focal animal sampling and scan sampling techniques, we recorded behaviors such as foraging, resting, interactions, and passing. We observed a higher frequency of active search behavior (BAT) during the dry season and resting on rocks (REP) during the rainy season. Feeding activity predominated in the dry month, in the morning, and in the outer sea region, while resting occurred in the inner sea during the rainy season, especially in the late afternoon. The results highlight the strong influence of seasonality and diurnal variation on the behavior of the brown booby and the composition of seabirds in Fernando de Noronha. The dry season favors greater feeding activity and diversity, especially in the outer sea, while the rainy season intensifies resting behaviors in the inner sea. These findings reinforce the importance of implementing long-term monitoring, gathering behavioral information on the seabird community in an oligotrophic environment.pt-BRAcesso AbertoAves marinhasFernando de NoronhaEcologia comportamentalAtobá-marromDiversidademasterThesisCIENCIAS BIOLOGICAS::ECOLOGIA