Ecological Archives A015-037-A1

David Joseph Horn, Michael L. Phillips, Rolf R. Koford, William R. Clark, Marsha A. Sovada, and Raymond J. Greenwood. 2005. Landscape composition, patch size, and distance to edges: interactions affecting duck reproductive success. Ecological Applications 15:1367–1376.

Appendix A (Table A1). Characteristics of fields in study areas in central North Dakota during the 1996 and 1997 breeding seasons.

Study area

Field size (ha)

No. duck nests

Mean DSR

Exposure days

Low-grassland

 
 
 
 

   Litchville

2

1

0.913

12

 

4

1

0.889

9

 

9

4

0.944

36

 

11

3

0.868

23

 

14

4

0.971

68

 

35

6

0.943

70

 

36

20

0.837

117

 

37

16

0.904

157

 

56

7

0.878

49

 

76

59

0.929

648

 

164

126

0.909

1141

 

192

23

0.895

191

   Bowdon

5

3

0.950

40

 

6

7

0.902

62

 

7

7

0.874

48

 

9

11

0.949

137

 

17

9

0.945

127

 

22

6

0.960

99

 

23

12

0.916

132

 

25

32

0.903

288

 

29

10

0.940

118

 

51

31

0.917

303

 

68

89

0.927

967

 

185

173

0.915

1732

High-grassland

 
 
 
 

   Medina

4

3

0.978

47

 

6

3

0.958

48

 

15

6

0.965

87

 

16

4

0.979

93

 

53

11

0.942

104

 

73

31

0.921

306

 

121

61

0.957

769

 

252

101

0.904

824

 

341

198

0.958

2570

 

606

323

0.967

4479

   Hurdsfield

17

6

0.917

61

 

50

43

0.913

402

 

55

16

0.964

250

 

60

17

0.931

190

 

259

22

0.949

295

 

276

47

0.947

621

 

477

73

0.890

607

† Daily survival rate.



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