How forest bird community are affected by stand commercial thinning’s?

Abstract

The total number of bird species after commercial thinning’s remained similar, but the total bird abundance decreased by 1.39 times. We registered 33 bird species totally. Analysing species, that during census made 4 and more registrations (17 species), the abundance of 64.7% species decreased, 29.4% - increased, 5.9% - remained similar. Statistical significant decrease of relative bird abundance after thinning’s were registered among the ground nesters and the top canopy nesters. The abundance of the hole nesters increased close to significant, however the relative abundance of the bottom canopy nesters remained similar. The abundance of migrants significantly decreased and opposite sedentary birds close to significantly increased. The abundance of the vertebrate and the invertebrate predators, the herbaceous significantly decreased as well as outside forest food searchers showed close to significant decrease. Among most abundant invertebrate predators, mostly negative abundance change were observed of the canopy and the air searcher guilds. The abundance of the ground searchers remained similar as well as the bark surface searchers increased close to significant.