| Summary: | Migratory birds in stage of cycle life and activity changes appear to be influenced by body mass, which varies with season, time of day, gender and populations. These variations in changes in several locations also may be related to time spent in the area and the local food supply and quality, as well as geographical variations of species. The study aimed to compare the biomass of migratory birds the Carapeba’s mangrove, Campos dos Goytacazes-RJ in northern region of Brazil. The average biomass observed in the Carapeba’s mangrove was lower than north of Brazil. Analyzing the data to seedling species Charadrius semipalmatus in agreement with Brazilian North region. Actitis macularius no well-defined pattern in the distribution of wing feathers. To Calidris fuscicolis, Numenius phaeopus, Pluvialis squatarola was not observed pattern of changes wing feathers because the number of subjects who had seedlings was low. Analysis of tail feathers, few individuals had changed and there was no set pattern for any species. Variations found at feathers and biomass can be related to supply and food quality in different areas and geographical variations of the species. Nas aves migratórias o estágio do ciclo de vida e a atividade de muda, parecem ser influenciados pela massa corporal que varia com estação, hora do dia, sexo e populações. Estas variações verificadas na muda em diversas localidades também podem estar relacionadas ao tempo de permanência na área e a oferta e qualidade alimentar local, bem como as variações geográficas das espécies. O estudo objetivou comparar a biomassa das aves migratórias do Mangue da Carapeba, Campos dos Goytacazes-RJ com a região Norte do Brasil. A média das biomassas observadas no Mangue da Carapeba foi menor que no Norte do Brasil. Na análise das mudas os dados para a espécie Charadrius semipalmatus concordam com os da região Norte Brasileira. Em Actitis macularius não houve padrão bem definido na distribuição das rêmiges. Para Calidris fuscicolis, Numenius phaeopus e Pluvialis squatarola ...
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