Mangrove tree crabs are a common inhabitant of mangrove ecosystems. Although absolute abundance measurements for the species are scarce, studies on Venezuelan populations of A. pisonii have yielded 20 to 170 individuals per study site (Conde & Díaz 1989, Díaz & Conde 1989). In Belize mangrove habitats, low crab abundances were seen, ranging between 0.03 to 0.10 crabs per cubic meter (Feller & Chamberlain 2007). Díaz and Conde (1989) observed that crab abundance may be related to species richness of nearby mangrove fouling communities and the presence of macroalgal food sources. In adult populations, sex ratios are often skewed toward females. This trend may develop because females exhibit slower growth rates than males on average, allowing them longer periods between risky and dangerous molting events (Díaz & Conde 1989).
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