Table 3. Temporal comparisons of percent composition of males surveyed in belt transects on CRP fields, by grazing treatments during previous (1992-1993: Kennedy 1994) and current (2001-2002) research periods at the Central Grasslands Research Extension Center, Streeter, ND.

 

 

Grazing Treatment

 

Rotation Grazing

Season Long

Idle

Species Previous Current Previous Current Previous Current
Savannah Sparrow

Bobolink

Grasshopper Sparrow

Clay-colored Sparrow

Red-winged Blackbird

Brown-headed Cowbird

Western Meadowlark

Eastern Kingbird

Western Kingbird

Lark Bunting

Common Yellowthroat

Sedge Wren

Yellow-headed Blackbird

12.4

8.1

51.3

0.0

5.0

8.4

12.1

0.0

0.0

1.7

0.3

0.0

0.7

23.5

25.0

17.4

20.5

8.8

1.5

0.0

1.5

0.0

0.0

0.0

0.0

0.0

11.5

15.8

44.6

0.7

7.2

13.8

6.5

0.0

0.0

0.0

0.0

0.0

0.0

37.9

10.3

34.4

13.8

0.0

0.0

3.4

0.0

0.0

0.0

0.0

0.0

0.0

1.1

33.7

55.1

1.1

1.1

0.0

0.0

0.0

0.0

4.5

0.0

3.4

0.0

37.9

34.5

13.9

10.3

0.0

0.0

0.0

0.0

3.4

0.0

0.0

0.0

0.0