Influence food supply activity of beaver (Castor fiber L.) on woter-front forest in the forest-steppe and stepp zones on the example of the Samara and Orenburg regions

The generality (84%) investigated beaver settlements in the river basins: Samara, Bolshoy Kinel, Malyy Kinel, Borovka and Chagan in the forest-steppe and steppe zones, there are various kinds of willow and maple ash a trunk diameter no more 6 cm, which are the main woody-shrub forage. If forest cover from 40% to 100% portion harvesting of total tree-shrub forage in the 65% settlements not exceed 3%. The portion consumption of total of portion exempting on the territory of the settlements in the steppe zone ranges from 30% to 100%, and in the steppe zone of 6.7% to 100%.