Biodiversity 5 Conservation 5 Forestry Species richness biodiversity species richness Ecosystems 4 Birds 3 United States 2 bird 2 species diversity 2 Agricultural areas 1 Annual dynamics 1 Arable land 1 Biodiversity pattern 1 Biodiversity patterns 1 Bioindicators 1 Biomarkers 1 Bird assemblage 1 Bird assemblages 1 Breeding Bird Survey (BBS) 1 Breeding bird survey 1 Cavity nester 1 Cavity nesters 1 Community metrics 1 Conservation planning 1 Core functions 1 Dead wood 1 Dispersions 1 Diversity index 1