ecological factors

The renovations to the ecological formulas of 36 species were made on the basis of 117 phytocoenotic descriptions in Saratov region. The entering of 8 new species in ecological scales of L.G. Ramenskiy et al (1956) are proposed/ In this paper the enumeration of additional species and their ecological formulas are adduced.

On the basis of our 1996-2009 field surveys in the Saratov region and adjacent territories, and our analysis of the literature data, the distribution and abundance dynamics of Dendrocopos major, D. syriacus, D. medius, D. leucotos, and D. minor is considered. The present habitation of D. leucotos in the Saratov region has been established to be associated with ripe deciduous woods in the Saratov Right-Volga-bank region; the bird penetrates for nesting up to 51°40* lati­ tude North along the Khopyor and Medveditsa river valleys. D.