14 Colorado
In 2023, we had complete survey coverage across the state of Colorado (Figure 14.1).
14.1 Colorado Statewide: Total
Colorado Statewide: Total
We obtained results for Colorado Statewide: Total by compiling and jointly analyzing data from 41 strata.
Field technicians completed 300 of 304 planned surveys (99%) in 2023. Technicians conducted 3170 point counts within the 300 surveyed grid cells between May 16 and July 24. They detected 214 bird species, including 37 priority species.
Bird Conservancy estimated densities and population sizes for 244 species that were detected in any year during which surveys were conducted, 48 of which are priority species. The data yielded robust density estimates (CV < 50%) for 135 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Colorado Statewide: Total for 250 species that were detected in any year during which surveys were conducted, 48 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 149 species.
14.2 All Other Lands in Colorado
All Other Lands in Colorado
We obtained results for All Other Lands in Colorado by compiling and jointly analyzing data from seven strata.
Field technicians completed 77 of 78 planned surveys (99%) in 2023. Technicians conducted 750 point counts within the 77 surveyed grid cells between May 17 and July 12. They detected 150 bird species, including 26 priority species.
Bird Conservancy estimated densities and population sizes for 207 species that were detected in any year during which surveys were conducted, 44 of which are priority species. The data yielded robust density estimates (CV < 50%) for 89 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout All Other Lands in Colorado for 210 species that were detected in any year during which surveys were conducted, 45 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 93 species.
14.3 Colorado BCR 10
Colorado BCR 10: Total
We obtained results for Colorado BCR 10: Total by compiling and jointly analyzing data from four strata.
Field technicians completed all planned surveys (100%) in 2023. Technicians conducted 216 point counts within the 19 surveyed grid cells between May 24 and July 7. They detected 96 bird species, including 14 priority species.
Bird Conservancy estimated densities and population sizes for 121 species that were detected in any year during which surveys were conducted, 23 of which are priority species. The data yielded robust density estimates (CV < 50%) for 27 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Colorado BCR 10: Total for 122 species that were detected in any year during which surveys were conducted, 23 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 28 species.
All Other Lands in Colorado BCR 10
We obtained results for All Other Lands in Colorado BCR 10 by compiling and analyzing data from one stratum.
Field technicians completed all planned surveys (100%) in 2023. Technicians conducted 54 point counts within the 5 surveyed grid cells between May 27 and June 29. They detected 64 bird species, including 8 priority species.
Bird Conservancy estimated densities and population sizes for 112 species that were detected in any year during which surveys were conducted, 22 of which are priority species. The data yielded robust density estimates (CV < 50%) for 10 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout All Other Lands in Colorado BCR 10 for 113 species that were detected in any year during which surveys were conducted, 22 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 13 species.
14.4 Colorado BCR 16
Colorado BCR 16: Total
We obtained results for Colorado BCR 16: Total by compiling and jointly analyzing data from 27 strata.
Field technicians completed 208 of 211 planned surveys (99%) in 2023. Technicians conducted 2176 point counts within the 208 surveyed grid cells between May 16 and July 24. They detected 166 bird species, including 26 priority species.
Bird Conservancy estimated densities and population sizes for 196 species that were detected in any year during which surveys were conducted, 37 of which are priority species. The data yielded robust density estimates (CV < 50%) for 106 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Colorado BCR 16: Total for 198 species that were detected in any year during which surveys were conducted, 37 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 114 species.
All Other Lands in Colorado BCR 16
We obtained results for All Other Lands in Colorado BCR 16 by compiling and analyzing data from one stratum.
Field technicians completed all planned surveys (100%) in 2023. Technicians conducted 193 point counts within the 24 surveyed grid cells between May 18 and July 12. They detected 115 bird species, including 13 priority species.
Bird Conservancy estimated densities and population sizes for 179 species that were detected in any year during which surveys were conducted, 33 of which are priority species. The data yielded robust density estimates (CV < 50%) for 49 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout All Other Lands in Colorado BCR 16 for 180 species that were detected in any year during which surveys were conducted, 34 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 50 species.
14.5 Colorado BCR 18
Colorado BCR 18: Total
We obtained results for Colorado BCR 18: Total by compiling and jointly analyzing data from five strata.
Field technicians completed 48 of 49 planned surveys (98%) in 2023. Technicians conducted 503 point counts within the 48 surveyed grid cells between May 17 and June 16. They detected 85 bird species, including 12 priority species.
Bird Conservancy estimated densities and population sizes for 132 species that were detected in any year during which surveys were conducted, 22 of which are priority species. The data yielded robust density estimates (CV < 50%) for 45 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Colorado BCR 18: Total for 134 species that were detected in any year during which surveys were conducted, 23 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 48 species.
Colorado BCR 18 Rivers
We obtained results for Colorado BCR 18 Rivers by compiling and jointly analyzing data from two strata.
Field technicians completed all planned surveys (100%) in 2023. Technicians conducted 82 point counts within the 8 surveyed grid cells between May 18 and June 2. They detected 77 bird species, including 4 priority species.
Bird Conservancy estimated densities and population sizes for 177 species that were detected in any year during which surveys were conducted, 27 of which are priority species. The data yielded robust density estimates (CV < 50%) for 26 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Colorado BCR 18 Rivers for 178 species that were detected in any year during which surveys were conducted, 27 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 29 species.
Non-river Lands in Colorado BCR 18
We obtained results for Non-river Lands in Colorado BCR 18 by compiling and jointly analyzing data from eight strata.
Field technicians completed 65 of 66 planned surveys (98%) in 2023. Technicians conducted 696 point counts within the 65 surveyed grid cells between May 17 and June 16. They detected 118 bird species, including 16 priority species.
Bird Conservancy estimated densities and population sizes for 175 species that were detected in any year during which surveys were conducted, 30 of which are priority species. The data yielded robust density estimates (CV < 50%) for 45 species.
Bird Conservancy estimated the proportion of 1 km² grid cells occupied (Ψ, Psi) throughout Non-river Lands in Colorado BCR 18 for 177 species that were detected in any year during which surveys were conducted, 30 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 53 species.