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Reproductive Output of Uca Vocator (Herbst, 1804) (Brachyura, Ocypodidae) from Three Subtropical Mangroves in Brazil

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Crab fecundity is widely known to vary proportionally to female size, but the female's nutritional state also has an important effect on egg production. This study evaluates intraspecific variability of reproductive output by monthly sampling Uca vocator populations from the Itapanhaú, Indaiá, and Itamambuca mangroves on the southeastern coast of Brazil. The presence of ovigerous crabs, their carapace width (CW) and their number of eggs were recorded. Additionally, the productivity of the mangroves and the content of organic matter of the sediments were analysed in order to estimate food availability in each locality. Size-specific fecundity relationships were obtained for each population and compared among the three populations. Ovigerous females from Itamambuca are the largest and their fecundities are also the highest among the populations studied. These results probably are associated with the favourable environmental conditions in Itamambuca, as this is a young mangrove with a high productivity level.

La fecundidad de los cangrejos es muy variable respecto a la talla de la hembra, pero su estado nutricional también puede tener importantes efectos en la producción de huevos. Este estudio estudia la variabilidad intraespecífica del potencial reproductor de Uca vocator mediante muestreos mensuales de poblaciones provenientes de los manglares de Itapanhaú, Indaiá e Itamambuca, en el litoral sudeste de Brasil. Se registró la presencia de hembras ovígeras, su anchura del caparazón (CW) y número de huevos. Asimismo, se analizó la productividad del manglar y el contenido en materia orgánica de los sedimentos con el fin de evaluar la disponibilidad del alimento en cada localidad. La relación talla-fecundidad se obtuvo para cada población, comparándose las tres poblaciones. Las hembras ovígeras de Itamambuca son las que tienen mayor talla y fecundidades más elevadas de las tres poblaciones estudiadas. Estos resultados están probablemente asociados a las buenas condiciones ambientales existentes en Itamambuca, que es un manglar joven de elevada productividad.


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