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Microplásticos versus ictioplâncton: quem é mais abundante em um estuário urbano?
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This study investigated the role of marine plastic debris as a substrate for pathogenic bacteria, finding that biofilms on plastic surfaces harbored pathogen concentrations significantly exceeding surrounding seawater. The plastisphere community included antibiotic-resistant strains and known aquatic pathogens, raising concerns about plastic debris as a vector for disease agent dispersal.
O estudo apresenta como objetivo investigar a distribuição e a abundância de microplásticos e larvas de peixes em um estuário urbano. Os resíduos analisados foram amostrados de três áreas distintas: estuário superior, médio e inferior. As larvas foram coletadas com auxílio de uma rede de plâncton de 500 μm, através de arrastos superficiais no sentido montante a jusante; para a categoria microplástica (<5mm) foram utilizadas as partículas retidas no copo da rede. Os microplásticos foram contados, medidos, identificados e classificados de acordo com o tamanho, tipo e cor. Considerando um total de 108 amostras, a distribuição plástica no estuário do Capibaribe apresentou de forma variável. O estuário apresenta abundância de microplástico de origem secundária, resultantes da fragmentação de plásticos maiores. Uma concentração de 19,71 part./m3 com tamanho médio de 2,2 mm, predominantes nas regiões superior e média. Os fragmentos moles correspondem ao tipo mais abundante (69%). O estuário apresenta uma abundância de larvas de peixes relativamente baixa 1,5 indivíduos/m3 com tamanho médio de 781,7 ± 449,8 mm, sendo Gobiiformes, a ordem mais abundante nesse ambiente. A natureza dinâmica do Capibaribe limita a degradação dos resíduos plásticos e contribui para a permanência desses resíduos nesse ambiente.
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Microplastics were found throughout a tropical Brazilian estuary across different seasons and zones, with densities roughly half those of fish larvae and comparable to fish egg densities. The results raise the possibility that microplastics compete with or are mistaken for natural food items by larval fish in this ecologically critical nursery habitat.
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Researchers investigated microplastic contamination and fish larval assemblages in the Douro estuary, Portugal, across monthly sampling surveys to assess co-occurrence and potential risk to early fish life stages. The study found that microplastics were present throughout the urban estuary and that fish larvae in nursery habitats face exposure risks from microplastic ingestion and associated pollutant uptake.
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