The examination of bird's communities in habitat fragmentation in Hyrcanian forests (Case study: Gorgan Township)

Birds are important biodiversity and habitat indicators. The study was conducted in forest located to the township of Gorgan, during the Spring of 2012. In this research, density and diversity indices of birds and correlation of bird species with environmental variables were studied in in four different patch sizes (300 ha. The Results showed that habitat variables including vegetation type, the number of snags, the number of logs, the number of trees with dbh 0- 20, 20-50, 50-100 and 100-300 cm and basal area, were the most important variables affecting the presence of birds in the study area (p