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Changes in Breeding Bird Populations in
North Dakota: 1967 to 1992-93

Appendix 1


Appendix 1. Statewide frequencies of occurrence (confidence interval) of common bird species (i.e. species with frequencies greater than 10%) in North Dakota.

Species
Year
1967
1992
1993
Green-winged Teal 18.0 (11.8-24.9) 3.1 ( 0.8- 6.5) 11.7 ( 6.6-17.8)
Mallard 60.9 (52.3-69.3) 35.9 (27.9-44.3) 53.9 (45.3-62.4)
Northern Pintail 52.3 (43.7-60.9) 13.3 ( 7.9-19.6) 24.2 (17.1-32.0)
Blue-winged Teal 38.3 (29.9-47.0) 18.8 (12.4-25.9) 25.0 (17.6-33.1)
Northern Shoveler 28.1 (20.6-36.2) 9.4 ( 4.9-14.8) 17.2 (11.2-23.9)
Gadwall 28.1 (20.6-36.2) 14.1 ( 8.5-20.5) 25.8 (18.5-33.7)
American Wigeon 11.7 ( 6.6-17.8) 7.0 ( 3.2-11.9) 7.8 ( 3.9-12.6)
Northern Harrier 11.7 ( 6.6-17.8) 16.4 (10.5-23.1) 25.0 (17.6-33.1)
Swainson's Hawk 5.5 ( 2.1-10.0) 10.9 ( 6.1-16.7) 19.5 (13.1-26.7)
Red-tailed Hawk 5.5 ( 2.1-10.0) 8.6 ( 4.2-14.1) 12.5 ( 7.3-18.6)
Gray Partridge 11.7 ( 6.6-17.8) 20.3 (13.9-27.4) 20.3 (13.9-27.4)
Ring-necked Pheasant 2.3 ( 0.4- 5.5) 11.7 ( 6.6-17.8) 17.2 (11.2-23.9)
Sharp-tailed Grouse 7.8 ( 3.9-12.6) 12.5 ( 7.3-18.6) 11.7 ( 6.6-17.8)
Sora 13.3 ( 7.9-19.6) 7.8 ( 3.9-12.6) 23.4 (16.3-31.3)
American Coot 23.4 (16.3-31.3) 6.3 ( 2.7-10.8) 14.1 ( 8.5-20.5)
Killdeer 49.2 (40.7-57.8) 43.0 (34.6-51.5) 56.3 (47.6-64.7)
Willet 13.3 ( 7.9-19.6) 7.8 ( 3.9-12.6) 8.6 ( 4.2-14.1)
Upland Sandpiper 28.1 (20.6-36.2) 38.3 (29.9-47.0) 37.5 (29.3-46.0)
Marbled Godwit 11.7 ( 6.6-17.8) 5.5 ( 2.1-10.0) 9.4 ( 4.9-14.8)
Wilson's Phalarope 22.7 (15.7-30.3) 6.3 ( 2.7-10.8) 10.2 ( 5.5-15.8)
Black Tern 21.1 (14.4-28.5) 3.9 ( 1.1- 8.1) 10.2 ( 5.5-15.8)
Mourning Dove 54.7 (46.1-63.2) 53.9 (45.3-62.4) 60.2 (51.6-68.5)
Common Nighthawk 5.5 ( 2.1-10.0) 7.0 ( 3.2-11.9) 10.2 ( 5.5-15.8)
Black-billed Cuckoo 4.7 ( 1.6- 9.0) 16.4 (10.5-23.1) 7.0 ( 3.2-11.9)
Downy Woodpecker 0 6.3 ( 2.7-10.8) 10.9 ( 6.1-16.7)
Yellow-shafted Flicker 16.4 (10.5-23.1) 14.1 ( 8.5-20.5) 18.8 (12.4-25.9)
Willow Flycatcher 12.5 ( 7.3-18.6) 5.5 ( 2.1-10.0) 19.5 (13.1-26.7)
Least Flycatcher 7.0 ( 3.2-11.9) 11.7 ( 6.6-17.8) 15.6 ( 9.8-22.3)
Say's Phoebe 3.1 ( 0.8- 6.5) 3.1 ( 0.8- 6.5) 12.5 ( 7.3-18.6)
Western Kingbird 38.3 (29.9-47.0) 64.1 (55.7-72.1) 60.9 (52.3-69.3)
Eastern Kingbird 54.7 (46.1-63.2) 76.6 (68.7-83.7) 74.2 (66.3-81.5)
Horned Lark 85.9 (79.5-91.5) 86.7 (80.4-92.1) 85.2 (78.5-90.9)
Bank Swallow 7.8 ( 3.9-12.6) 10.2 ( 5.5-15.8) 12.5 ( 7.3-18.6)
Cliff Swallow 5.5 ( 2.1-10.0) 14.8 ( 9.1-21.5) 18.0 (11.8-24.9)
Barn Swallow 39.8 (31.5-48.4) 57.0 (48.5-65.4) 58.6 (50.1-66.9)
Blue Jay 7.0 ( 3.2-11.9) 11.7 ( 6.6-17.8) 10.9 ( 6.1-16.7)
American Crow 18.8 (12.4-25.9) 9.4 ( 4.9-14.8) 19.5 (13.1-26.7)
Black-capped Chickadee 2.3 ( 0.4- 5.5) 12.5 ( 7.3-18.6) 15.6 ( 9.8-22.3)
House Wren 15.6 ( 9.8-22.3) 35.9 (27.9-44.3) 32.8 (25.1-40.9)
Marsh Wren 6.3 ( 2.7-10.8) 9.4 ( 4.9-14.8) 12.5 ( 7.3-18.6)
American Robin 15.6 ( 9.8-22.3) 33.6 (25.7-41.9) 35.9 (27.9-44.3)
Gray Catbird 10.9 ( 6.1-16.7) 14.8 ( 9.1-21.5) 14.1 ( 8.5-20.5)
Brown Thrasher 18.8 (12.4-25.9) 34.4 (26.5-42.6) 41.4 (33.1-49.9)
Cedar Waxwing 7.0 ( 3.2-11.9) 14.1 ( 8.5-20.5) 10.2 ( 5.5-15.8)
Loggerhead Shrike 6.3 ( 2.7-10.8) 10.9 ( 6.1-16.7) 11.7 ( 6.6-17.8)
Warbling Vireo 6.3 ( 2.7-10.8) 9.4 ( 4.9-14.8) 14.8 ( 9.1-21.5)
Yellow Warbler 22.7 (15.7-30.3) 19.5 (13.1-26.7) 21.1 (14.4-28.5)
Common Yellowthroat 29.7 (22.1-37.8) 28.9 (21.5-36.8) 39.1 (30.7-47.7)
Chipping Sparrow 5.5 ( 2.1-10.0) 14.8 ( 9.1-21.5) 14.8 ( 9.1-21.5)
Clay-colored Sparrow 39.8 (31.5-48.4) 35.9 (27.9-44.3) 35.2 (27.1-43.6)
Vesper Sparrow 52.3 (43.7-60.9) 50.0 (41.4-58.6) 52.3 (43.7-60.9)
Lark Sparrow 8.6 ( 4.2-14.1) 11.7 ( 6.6-17.8) 9.4 ( 4.9-14.8)
Lark Bunting 41.4 (33.1-49.9) 40.6 (32.1-49.4) 25.0 (17.6-33.1)
Savannah Sparrow 63.3 (54.7-71.5) 28.1 (20.6-36.2) 44.5 (36.1-53.1)
Baird's Sparrow 24.2 (17.1-32.0) 18.0 (11.8-24.9) 20.3 (13.9-27.4)
Grasshopper Sparrow 48.4 (39.9-57.0) 50.0 (41.4-58.6) 46.1 (37.6-54.7)
Song Sparrow 20.3 (13.9-27.4) 25.8 (18.5-33.7) 32.8 (25.1-40.9)
Chestnut-collared Longspur 47.7 (39.1-56.3) 39.1 (30.7-47.7) 39.8 (31.5-48.4)
Bobolink 44.5 (36.1-53.1) 36.7 (28.5-45.3) 43.8 (35.3-52.4)
Red-winged Blackbird 80.5 (73.3-86.9) 67.2 (59.1-74.9) 67.2 (59.1-74.9)
Western Meadowlark 94.5 (90.0-97.9) 77.3 (69.7-84.3) 82.0 (75.1-88.2)
Yellow-headed Blackbird 11.7 ( 6.6-17.8) 16.4 (10.5-23.1) 18.0 (11.8-24.9)
Brewer's Blackbird 7.8 ( 3.9-12.6) 9.4 ( 4.9-14.8) 17.2 (11.2-23.9)
Common Grackle 25.8 (18.5-33.7) 39.1 (30.7-47.7) 34.4 (26.5-42.6)
Brown-headed Cowbird 81.3 (74.1-87.6) 83.6 (76.9-89.5) 89.1 (83.3-93.9)
Orchard Oriole 9.4 ( 4.9-14.8) 18.0 (11.8-24.9) 18.8 (12.4-25.9)
Baltimore Oriole 11.7 ( 6.6-17.8) 21.1 (14.4-28.5) 14.8 ( 9.1-21.5)
American Goldfinch 38.3 (29.9-47.0) 34.4 (26.5-42.6) 43.0 (34.6-51.5)
House Sparrow 17.2 (11.2-23.9) 21.9 (14.9-29.6) 22.7 (15.7-30.3)

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