Influence of environmental patterns on the population structure and secondary production of the fiddler crab Uca maracoani (Latreille) in the Amazon mangroves.
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Museu Paraense Emílio Goeldi
Título:
Influência dos padrões ambientais na estrutura populacional e na produção secundária do caranguejo-violinista Uca maracoani (Latreille) nos manguezais da Amazônia.
Descrição
Uca maracoani is a fiddler crab found in estuaries along the western Atlantic coast, with a notable preference for euhaline environments. This study aimed to analyze the population structure and dynamics of this species in an estuary on the North Coast of Brazil, specifically in an area of the upper estuary where seasonal rainfall fluctuations result in significant changes in salinity. Monthly crab samples were taken from December 2013 to November 2015, together with measurements of environmental variables, such as water and climate parameters. The population maintains a balanced sex ratio; however, males are generally larger, with lower mortality rates and longer lifespans than females. Reproduction is continuous but mainly takes place in the dry season when salinity levels are higher (above 12‰). Higher crab densities have been observed during the rainy season when, despite lower salinity levels (below 10‰), the conditions for survival (food availability and milder climate) seem to be more favorable. The estimated average annual biomass and production for the population were 2.62 g AFDM m 2 and 5.43 g AFDM m 2 year 1, respectively, characterized by a high turnover rate (P/B = 2.10 year 1). Our results suggest that U. maracoani has thriving populations in the Amazon coast’s mangroves, benefiting from the vast muddy intertidal zone and the high organic content delivered by the estuaries.
Resumo
Uca maracoani é um caranguejo-violinista encontrado em estuários ao longo da costa atlântica ocidental, com notável preferência por ambientes euhalinos. Este estudo teve como objetivo analisar a estrutura e a dinâmica populacional dessa espécie em um estuário do litoral norte do Brasil, especificamente em uma área da parte superior do estuário onde as flutuações sazonais de precipitação resultam em mudanças significativas na salinidade. Amostras mensais de caranguejos foram coletadas de dezembro de 2013 a novembro de 2015, juntamente com medições de variáveis ambientais, como parâmetros da água e do clima. A população mantém uma proporção sexual equilibrada; no entanto, os machos são geralmente maiores, com menores taxas de mortalidade e maior longevidade do que as fêmeas. A reprodução é contínua, mas ocorre principalmente na estação seca, quando os níveis de salinidade são mais elevados (acima de 12‰). Higher crab densities have been observed during the rainy season when, despite lower salinity levels (below 10‰), the conditions for survival (food availability and milder climate) seem to be more favorable. The estimated average annual biomass and production for the population were 2.62 g AFDM m 2 and 5.43 g AFDM m 2 year 1, respectively, characterized by a high turnover rate (P/B = 2.10 year 1). Our results suggest that U. maracoani has thriving populations in the Amazon coast’s mangroves, benefiting from the vast muddy intertidal zone and the high organic content delivered by the estuaries.
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AVIZ, Daiane; PETRACCO, Marcelo; CARMONA, Priscila Amorim; SANTOS, ClÉverson Rannieri Meira dos. Influence of environmental patterns on the population structure and secondary production of the fiddler crab Uca maracoani (Latreille) in the Amazon mangroves. Marine Environmental Research, v. 199, p. 106603, 2024.