The analysis of food spectrum of a pool frog (Rana lessonae) in the urbanization territory of the Middle Volga region

A food of pool frog Rana lessonae was investigated in the sites with a variable degree of an urbanization conditions, in districts with mainly low-storeyed buildings, in a industrial zone, in a residential suburb and in the control. The greatest trophic niche width, according the Sλ index was noted in the industrial zone (13.88), residential suburb (Sλ = 11,05), control conditions (Sλ = 9,84) and the least (Sλ = 2,56) in the conditions of sites with lowstoreyed buildings.