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To understand bird species responses to edge effect, we studied changes in diversity, density and abundance of bird communities and environmental variables along an edge-interior gradient in Iran's Hyrcanian forests and observed significant differences in Simpson diversity index, Shannon diversity index, N1 and N2 indices. Bird community analysis divided bird species into two main bird groups that were either positively or negatively correlated with environmental variables. The first groupdoi:10.25680/3436.2018.29.75.218 fatcat:gbnjzjmgpjaohhqkxqgiw7g5vq