The analysis of qualitative and quantitative components of a trophic niche of shorebirds around the Suskansky gulf (the Samara region)

The analysis of the size and overlapping of trophic niches for colonial shorebirds around the Suskansky gulf, the Stavropol district of the Samara region is carried out. It is detected, that the greatest size of a trophic niche on prey specimen number has the black-headed gull (S λ = 4,39), on weight of food objects - a grey heron (S λ = 2,54). The least trophic niche size on two rates has common tern (S λ = 1,30 and S λ = 1,52). Trophic niches of a lake seagull and common tern (I = 69,36), in comparison with a grey heron are considerably overlapping.