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

Table 2 and 3


Table 2. Composition of breeding birds and mean number of indicated pairs on 128 randomly selected quarter-sections in North Dakota, by year, breeding habitat, and migratory status.
No. of species
Percent of observed pairs
Mean pairs/100 ha
1967
1992
1993
1967
1992
1993
Breeding Habitat
Wetland 51 26.2 18.3 20.9 37.0 24.3 31.6
Grassland 24 47.5 38.3 41.0 67.2 50.9 62.0
Shrubland 14 6.3 7.2 7.5 8.9 9.6 11.3
Open habitat/scattered trees 8 4.2 8.3 6.6 5.9 11.1 10.0
Open woodland/edge 37 11.5 18.5 16.8 16.1 24.3 25.2
Woodland 14 0.4 0.9 1.1 0.6 1.2 1.6
Residential/human structures 8 3.1 7.2 5.3 4.4 9.5 8.0
Other 5 0.8 1.3 0.8 1.1 1.7 1.2
Migratory Status
Long-distance migrant 62 31.2 38.6 31.7 43.8 51.1 47.7
Short-distance migrant 86 67.4 57.8 65.0 95.4 76.8 98.3
Permanent resident 13 1.4 3.6 3.3 2.0 4.7 4.9

Table 3. Land use changes on the 128 quarter-sections surveyed in 1967, 1992, and 1993, and percentage change between the two periods (1992 and 1993 averaged).
Habitat
Area (ha)
Percent
Change
1967
1992
1993
Cropland 3870 4113 4093 +6.0
Grassland 2142 2093 2084 -2.5
Wetland 736 529 545 -27.0
Hayland 458 214 224 -52.2
Planted cover 403 564 564 +40.0
Woodland/shrubland 268 320 320 +19.4
Human-made structures 308 349 351 +13.6
Clay buttes 83 88 88 +6.0


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