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POPULATION BIOLOGY OF UCA THAYERI RATHBUN, 1900 (BRACHYURA, OCYPODIDAE) IN A SUBTROPICAL SOUTH AMERICAN MANGROVE AREA: RESULTS FROM TRANSECT AND CATCH-PER-UNIT-EFFORT TECHNIQUES

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The population biology of Uca thayeri was studied in a subtropical mangrove in Ubatuba, State of São Paulo, Brazil. Two sampling techniques were used: transect sampling and catch-per-uniteffort. Size frequency distribution, sex-ratio, and reproductive period were analysed. For juvenile crabs (CW < 4.6 mm), the transect procedure was most efficient, while ovigerous females were most collected during the capture effort. Males were most numerous in the transect technique, while in the catch-per-unit-effort there was no difference between sexes. The species showed a different size frequency distribution for each sampling procedure. The reproduction of U. thayeri is seasonal, being more pronounced in the warmer months of the year. However, juveniles occurred all over the year, although more numerous in the colder months. The success of the species in reproductive activity and the constant colonization of the area can be attributed to the availability of food resources and differential occupation of the habitat by ovigerous females.



Se ha estudiado la biología poblacional de Uca thayeri en un manglar subtropical de Ubatuba, Estado de São Paulo, Brasil. Se emplearon dos métodos de muestreo: transectos y capturas por unidad de esfuerzo. Se analizó la distribución de frecuencias de tallas, proporción de sexos y periodo reproductivo. Para los ejemplares juveniles y machos adultos (CW < 4,6 mm) el método de transectos fue el procedimiento más eficaz, mientras que las hembras ovígeras fueron evaluadas más eficazmente mediante capturas por unidad de esfuerzo. La especie mostró diferentes distribuciones de frecuencias de tallas según el método de muestreo. La reproducción de U. thayeri es estacional, siendo más importante en los meses cálidos. Sin embargo, los juveniles aparecieron durante todo el año, aunque siendo más numerosos en los meses fríos. El éxito en la actividad reproductiva y la colonización constante en el área puede ser atribuida a la disponibilidad del alimento y a la diferente ocupación del hábitat por las hembras ovígeras.

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/content/journals/10.1163/156854002321518144
2002-11-01
2016-12-08

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