THE ESTIMATION OF CHANGES OF AVIFAUNA IN MIXED WOOD OF NORTH WESTERN MOSCOW AREA FOR 57 YEARS

Abstract

The scale of the anthropogenic transformation of natural environment in the recent
decades is constantly increasing. From the late 1990s animals have appeared in new wildlife
management conditions. An attempt to comparatively estimate the change in the avifauna of
mixed forests for 57 years was initiated in this work in connection with anthropogenic change
of mixed wood and its surroundings. Calculations were made in the sections of the forest,
located far from the converted territories. The analysis of the avifauna is represented in the
comparative aspect, on the basis of the statistics of birds in 1954, 1987-1990, 1998-2000
and 2011. The environmental changes were relatively favorable for the plastic forms of birds
and unfavorable for the narrow specialized forms. Fundamental changes in the avifauna for
a 57 year period were not revealed.
In 2011, after a small decrease in 1998-2000 years, an increase in the density of bird population
to the level of 1954 was noted. Coeffi cient of the degree of similarity of specifi c variety during
the periods from 1987 to 1990 and from 1998 to 2000 years have high value - 84,2, and 73,0 in
2011 respectively. The changes of avifauna are related to species composition. The dominant
group of birds preserved its composition as a whole. The tendency of retention of the number
of background and numerous species with insignifi cant reduction in their portion was outlined.
Reduction in the number of usual species with the growth of their fraction in avifauna, reduction
in the quantity and fraction of numerically insignifi cant species were observed.