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The influence of abiotic factors on the spatial distribution of the fiddler    crabs Uca leptodactyla, U. maracoani, U. rapax and U.    thayeri was    studied in a tropical mangrove of northeast Brazil. Eight transects were    delimited in a mangrove area of the Pacoti River. On each transect, three    0.25 m2 squares were sampled during spring low tide periods from September    2003 to August 2004. The sediment of the squares at each transect was analysed    for grain size, organic matter and humidity. Morphology of the second maxilliped    was studied considering the number of spoon-tipped setae to help explain    the ecological distribution of the species. U. leptodactyla and U.    rapax    were found living in medium sand, U. thayeri was collected in fine and very    fine sand, while U. maracoani was found living in very fine sand. U.    leptodactyla showed a negative correlation with organic matter and humidity while U.    thayeri    showed a positive correlations for both factors. U.    maracoani and U. rapax    were not correlated with organic matter or humidity. The analysis of the    second maxilliped revealed that U. leptodactyla and U.    rapax show a high    quantity of spoon-tipped setae while U. maracoani and U.    thayeri show a greater  quantity of plumose setae

Spatial distribution of fiddler crabs (Genus <i>Uca</i>) in a tropical mangrove of northeast Brazil