Fig. 4From: Rapid increase in numbers and change of land-use in two expanding Columbidae species (Columba palumbus and Streptopelia decaocto) in AlgeriaAbundances of Woodpigeon numbers according to cardinal flight directions during March–May 2006 in Baraki station (Algiers). Vertical error bars represent standard deviations. Annual densities with the same letter are not significantly different (P = 0.05) following Tukey’s HSD testsBack to article page