Data for: Effects of forest management on bird assemblages in oak-dominated stands of the Western Carpathians - refuges for rare species

File contain all raw data collected during the study described in the manuscript preliminary titled „Effects of forest management on bird assemblages in oak-dominated stands of the Western Carpathians — undervalued sites for rare species”, that is: i) characteristics of sampling sites, ii) values of environmental features, iii) results of bird counting during 3 periods, iv) calculated values of bird diversity indices.