Abstract
The paper examines the influence of the location of settlements, railroads and highways on the spatial structure of the Otis tarda population in the Trans-Volga region studied on a model area of 12,000 km2, located in the southern part of the Saratov Trans-Volga region in 1998 - 2016. The zone of influence of our estimated disturbance factor caused by the movement of people and a variety of ground vehicles along roads of various purposes, on the territorial distribution of bustards in the autumn can be located as a 300 - 500 m width band on both sides of the transport communications. Shelter belts created along transport communications render a beneficial effect on the distribution of O. tarda and the disturbance influence reduction. Besides, crop rotation fields with the side sizes more than 1 km can be considered a factor to compensate for the birds’ anxiety. We have found that in the Saratov Trans-Volga region, because of the large size of crop rotation fields and the significant development of roadside and shelter belts, no special measures are required to protect O. tarda as to restrict the movement of people and vehicles on the territory where this species lives.
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