Banca de QUALIFICAÇÃO: ANDRÉ ALVES REIS SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRÉ ALVES REIS SILVA
DATE: 12/12/2024
TIME: 09:00
LOCAL: SALA DE REUNIÕES DO DECOL
TITLE:

BEHAVIOR AND USE PATTERNS BY SEABIRDS ON A BRAZILIAN OCEANIC ISLAND.

KEY WORDS:

Seabirds; behavior; Brown booby (Sula leucogaster); Fernando de Noronha; diversity; flight activity

PAGES: 43
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Seabirds, top predators in the food chain, have a wide global distribution and the capacity for behavioral flexibility, adjusting their foraging strategies according to abiotic factors and prey availability. In Brazil, oceanic islands such as the Fernando de Noronha Archipelago serve as crucial areas for breeding, resting, and feeding. Noronha stands out for its biodiversity, hosting species like the magnificent frigatebird (Fregata magnificens), boobies (Sula spp.), and noddies (Anous spp.). In the first chapter, we investigated the behavior of the brown booby (Sula leucogaster) in Fernando de Noronha, considering spatial, diurnal (7:00 AM, 9:00 AM, 11:00 AM, 3:00 PM, 5:00 PM), and seasonal (wet and dry) variations. Using focal animal and scan sampling techniques, we recorded behaviors such as foraging, resting, interactions, and transit. Active search behavior (BAT) was more frequent during the dry season, while resting on rocks (RPE) was predominant during the wet season. Feeding activity was concentrated in the dry season, during the morning, and in the mar de fora region, whereas resting occurred in the mar de dentro area during the wet season, particularly in the late afternoon. In the second chapter, we assessed the composition of seabird communities in flight over the main island, considering sampling times, seasonality, and spatial patterns. We found higher diversity during the dry season, particularly in the mar de fora region in the morning and under conditions without swell. The mar de dentro region exhibited greater variability between morning and afternoon, highlighting seasonal differences. Our results underscore the significant influence of seasonality and diurnal variation on the behavior of the brown booby and the composition of seabird communities in Fernando de Noronha. The dry season favors increased feeding activity and diversity, particularly in the mar de fora, while the wet season intensifies resting behaviors in the mar de dentro. These findings emphasize the importance of management strategies that account for temporal and spatial variability, contributing to the conservation of these species and their habitats.

COMMITTEE MEMBERS:
Presidente - 1378974 - LIANA DE FIGUEIREDO MENDES
Externo à Instituição - MARCELO CÂMARA RODRIGUES
Externo à Instituição - RANDSON MODESTO COÊLHO DA PAIXÃO