Distribution patterns of the crab Ucides cordatus (Brachyura, Ucididae) at different spatial scales in subtropical mangroves of Paranaguá Bay (southern Brazil)

Table 2 Multiple regression analysis between burrow densities and environmental variables (mean grain size, sorting, clay percentage, organic matter content, and pneumatophore density)

Dependent variable	Effect	β	R ²	P
Total crab burrows	Mean grain size	−0.404	0.16	0.037
Crab burrows < 60 mm	Mean grain size	−0.383	0.15	0.048
Crab burrows ≥ 60 mm	None

The only variable selected in the stepwise forward procedure was mean grain size. β partial correlation coefficient; R ² coefficient of determination

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