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Avian Use of Forest Habitats in the Pembina Hills of Northeastern North Dakota

Tables


Table 1. Vegetative characteristics of forest habitats in the Pembina River study area, North Dakota, 1981.
Characteristic Quaking Aspen Lowland forest Bur oak Willow shrub Serviceberry thicket
Trees per hectare 595 492 178 7.4 0
Basal area (m²) 3.8 5.4 1.2 0.03 0
Trees by diameter class (cm)
7.6-15.2 85 65 23 1.5 0
15.2-22.8 32.5 22 8 0 0
22.8-38.1 3 8 7 0 0
38.1-53.3 0 3 0 0 0
53.3-68.6 0 1 0 0 0
Shrub density (no. stems per ha) 36,000 16,533 120,533 131,200 179,800
Percent ground cover 77 61 83 61 100
Percent canopy cover 47.5 75 27 5.5 0
mean of x vegetation height (m) 9.6 15.4 5 2.7 1.8

Table 2. Estimated population sizes and breeding densities of bird families in the Pembina River study area, North Dakota, 1981.
Family Number of species Estimated population Percent total Density pairs per
km² 100 acres
Parulidae 7 28,082 36.96 369.89 149.75
Fringillidae 7 17,504 23.04 230.56 93.34
Mimidae 1 5,338 7.03 70.31 28.47
Tyrannidae 6 5,269 6.93 69.40 28.09
Turdidae 2 3,879 5.10 51.09 20.68
Vireonidae 5 3,282 4.32 43.23 17.50
Bombycillidae 1 2,933 3.86 38.63 15.64
Columbidae 1 2,422 3.19 31.90 12.91
Trochilidae 1 1,730 2.30 22.78 9.22
Thraupidae 1 1,550 2.04 20.41 8.26
Icteridae 3 1,451 1.91 19.11 7.73
Paridae 1 1,409 1.85 18.55 7.51
Picidae 3 254 0.33 3.34 1.35
Sittidae 1 243 0.32 3.20 1.29
Corvidae 3 235 0.31 3.09 1.25
Troglodytidae 1 148 0.20 1.94 0.78
Tetraonidae 1 126 0.17 1.65 0.67
Cuculidae 1 71 0.09 0.93 0.38
Hirundinidae 2 30 0.03 0.39 0.16
Accipitridae 1 8 0.01 0.10 0.04
Meleagrididae 1 8 0.01 0.10 0.04
Totals 50 75,972 100.00 1,000.61 405.66

Table 3. Estimated populations and mean densities of major breeding bird species in the Pembina River study area, North Dakota, 1981.
Species Mean density per Estimated Population Percent total population
km² 100 acres
Yellow Warbler 194.1 78.6 14,739 19.40
American redstart 105.0 42.5 7,973 10.50
Clay-colored sparrow 95.2 38.5 7,226 9.51
Gray catbird 70.3 28.5 5,338 7.03
Veery 50.9 20.6 3,867 5.09
American goldfinch 47.3 19.1 3,591 4.73
Common yellowthroat 47.0 19.0 3,571 4.70
Cedar waxwing 38.6 15.6 2,933 3.86
Rufous-sided towhee 33.7 13.7 2,562 3.37
Mourning dove 31.9 12.9 2,422 3.19
Ruby-throated hummingbird 22.8 9.2 1,730 2.27
Red-eyed vireo 22.2 8.9 1,685 2.22
Least flycatcher 20.7 8.4 1,572 2.10
Scarlet tanager 20.4 8.3 1,550 2.04
Black-capped chickadee 18.6 7.5 1,409 1.85
Rose-breasted grosbeak 18.4 7.4 1,394 1.83
Song sparrow 16.7 6.8 1,272 1.67
Alder flycatcher 16.4 6.6 1,242 1.63
Warbling vireo 16.3 6.6 1,235 1.62
Indigo bunting 16.0 6.5 1,213 1.60

Table 4. Characteristics of breeding bird populations among major forest habitats, Pembina River study area, North Dakota, 1981.
Habitat Number of species Mean density (pairs/km²) Species diversity (H')
Lowland forest 32 1,311 3.647
Quaking aspen 38 723 3.641
Willow shrub 19 2,207 3.006
Serviceberry thicket 14 807 2.936
Bur oak forest 34 847 2.866

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