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Distribution and local density of species as a function of the number of species in 20 taxonomically and ecologically defined groups of birds. Number of sites per species is independent of number of species per group (F1,18 = 0.1, P = 0.75); local density per species increased with the size of the ecological group (F1,18 = 5.8, P = 0.027, R2 = 0.24; slope 0.099 ± 0.041 SE pairs per hectare per log10-transformed number of species).
