2025-12-012025-12-012025-11-04LUZ, Jenny Márcia Pereira. Origens transoceânicas e dinâmica de garrafas plásticas em uma praia recreativa da Amazônia: um estudo de caso na praia de Ajuruteua, Pará, Brasil. Orientadora: Luci Cajueiro Carneiro Pereira; Coorientadora: Brenda Ribeiro Padilha da Silva. 2025. 41 f. Trabalho de Curso (Licenciatura em Ciências Biológicas) – Faculdade de Ciências Biológicas. Instituto de Estudos Costeiros, Campus Universitário de Bragança, Universidade Federal do Pará, Bragança-PA, 2025. Disponível em: https://bdm.ufpa.br/handle/prefix/8908. Acesso em: .https://bdm.ufpa.br/handle/prefix/8908This study analyzed the origin and dynamics of allochthonous plastic bottles accumulated on Ajuruteua Beach, northeastern Pará, Brazilian Amazon coast. The aim was to characterize the composition and trace the origins of plastic bottles found on the beach. Monthly monitoring was conducted between February 2023 and January 2024, integrating litter data and hydrodynamic variables. A total of 596 items were collected, 99% of which were plastics, with 52.7% originating from Africa and 38.9% from Asia, totaling 171 brands from 48 countries. Mauritania (32%) and China (27.5%) stood out as the main sources, with a highly significant association between country and litter frequency (χ² = 1,396.231; p < 0.001; φc = 0.985). The predominance of PET mineral water bottles (93.9%) reflects both the ubiquity of this material and its environmental persistence. Expiration dates indicated recent deposition (≤ 2 years), suggesting illegal disposal by transoceanic vessels, reinforced by intense regional maritime traffic. NE winds (up to 12.5 m·s⁻¹), mean waves of 1.7 m, and currents up to 0.16 m·s⁻¹ favored the transport and deposition of litter. We conclude that Ajuruteua Beach acts as a receptor of transoceanic plastic debris, influenced by both oceanographic and anthropogenic factors. The results reinforce the need for international cooperation and integrated coastal management policies to reduce plastic inputs and promote sustainability on Amazon beaches.Acesso AbertoPraia de AjuruteuaZona Costeira AmazônicaResíduos TransoceânicosAjuruteua BeachAmazon Coastal ZoneTransoceanic DebrisCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIATrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil