NPWRC :: Duck Nest Success

Northern Prairie Wildlife Research Center

**Table 2.** Numbers (n), exposure periods (Days), and estimated rates of success (Rate) of gadwall nests by habitat, study area, and year in the Prairie Pothole Region of Canada. Rates of nest success were estimated by the modified Mayfield method (Johnson 1979).
Study area and year	Cropland	Grass	Brush	Wetland	Hayland	Woodland	Right-of-way	Odd area^a
n	Days	Rate	n	Days	Rate	n	Days	Rate	n	Days	Rate	n	Days	Rate	n	Days	Rate	n	Days	Rate	n	Days	Rate
Earl Grey
1985	0	-	-	0	-	-	2	44.0	1.00	1	6.0	<0.01	4	55.5	0.28	0	-	-	2	38.0	0.39	4	18.5	<0.01
Hanley
1982	0	-	-	0	-	-	3	65.0	1.00	0	-	-	0	-	-	0	-	-	1	4.0	0.0	1	4.0	0.0
1983	0	-	-	1	2.0	1.00	4	19.0	0.0	0	-	-	0	-	-	0	-	-	0	-	-	1	4.0	0.0
1984	0	-	-	1	5.0	0.0	1	2.0	0.0	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-
1985	0	-	-	4	63.5	0.57	6	42.0	0.01	0	-	-	0	-	-	0	-	-	3	47.0	0.22	4	37.5	0.02
Hay Lakes
1983	0	-	-	1	13.0	1.00	0	-	-	3	39.0	0.16	0	-	-	2	25.0	0.24	0	-	-	2	40.0	0.41
1984	0	-	-	0	-	-	0	-	-	1	4.5	0.0	0	-	-	2	13.0	<0.01	5	67.5	0.20	2	28.0	0.08
Holden
1983	0	-	-	2	28.0	0.28	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-
Inchkeith
1984	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-
1985	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	1	12.0	1.00	3	22.5	0.01	4	26.0	0.01
Leask
1984	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	1	11.0	1.00	2	9.0	0.0	0	-	-
1985	0	-	-	1	18.5	0.14	0	-	-	0	-	-	3	49.0	0.23	0	-	-	0	-	-	7	73.5	0.09
Moore Park
1983	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	1	5.0	0.0	3	55.0	0.53
1984	0	-	-	0	-	-	0	-	-	2	14.0	0.08	0	-	-	0	-	-	0	-	-	5	57.0	0.29
Penhold
1984	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-
1985	0	-	-	0	-	-	0	-	-	3	67.0	1.0	0	-	-	0	-	-	0	-	-	0	-	-
Yorkton
1985	0	-	-	2	25.0	0.24	1	13.0	0.06	0	-	-	0	-	-	0	-	-	1	18.0	1.00	2	6.0	0.0
Cartwright
1983	0	-	-	0	-	-	0	-	-	0	-	-	1	25.0	1.00	0	-	-	1	17.5	0.13	0	-	-
Ceylon
1983	0	-	-	4	28.5	0.02	106	1,573.5	0.49	0	-	-	0	-	-	0	-	-	3	11.5	0.0	5	57.5	0.08
1984	0	-	-	1	17.0	0.12	19	190.5	0.07	0	-	-	0	-	-	0	-	-	2	16.0	0.01	0	-	-
Craik
1984	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-	0	-	-
1985	0	-	-	0	-	-	2	30.0	0.31	2	10.5	<0.01	0	-	-	0	-	-	4	25.5	<0.01	2	10.0	0.0
Denzil
1984	0	-	-	0	-	-	1	6.0	<0.01	2	10.0	0.0	0	-	-	0	-	-	2	32.0	0.10	2	22.5	0.04
1985	0	-	-	0	-	-	1	14.0	0.08	0	-	-	2	45.0	0.46	0	-	-	2	21.5	.0.3	4	40.0	0.03
Gayford
1985	0	-	-	0	-	-	5	84.0	0.43	0	-	-	1	31.0	1.00	0	-	-	4	73.0	0.23	7	136.0	0.35
Goodwater
1983	0	-	-	3	20.5	<0.01	20	267.5	0.40	0	-	-	2	25.5	0.25	0	-	-	5	32.5	0.03	7	105.5	0.36
Shamrock
1982	0	-	-	2	25.5	0.25	24	393.2	0.37	0	-	-	5	82.0	0.42	0	-	-	4	72.2	0.23	1	14.0	0.08
1983	0	-	-	3	47.0	0.47	45	540.0	0.16	0	-	-	17	200.0	0.07	0	-	-	7	31.5	0.0	6	54.0	0.07
1984	0	-	-	0	-	-	5	28.0	<0.01	0	-	-	1	11.0	0.04	0	-	-	0	-	-	1	2.5	0.0
1985	0	-	-	1	18.0	1.00	2	26.5	0.26	1	4.0	0.0	0	-	-	0	-	-	3	27.5	0.27	2	32.0	1.00
Tichfield
1982	0	-	-	1	19.5	0.16	11	234.5	0.47	0	-	-	1	5.0	0.0	0	-	-	0	-	-	1	25.0	0.24
^aOdd area included patches of cover <2ha in size and an array of features usually found in Cropland (e.g., rock piles, gravel borrow pits, narrow borders of upland vegetation around Wetland and along fences between areas of Cropland).

Table 2. Numbers (n), exposure periods (Days), and estimated rates of success (Rate) of gadwall nests by habitat, study area, and year in the Prairie Pothole Region of Canada. Rates of nest success were estimated by the modified Mayfield method (Johnson 1979).

Study area and year

Cropland

Grass

Brush

Wetland

Hayland

Woodland

Right-of-way

Odd area^a

Days

Rate

Days

Rate

Days

Rate

Days

Rate

Days

Rate

Days

Rate

Days

Rate

Days

Rate

Earl Grey

1985

44.0

1.00

6.0

<0.01

55.5

0.28

38.0

0.39

18.5

<0.01

Hanley

1982

65.0

1.00

4.0

0.0

4.0

0.0

1983

2.0

1.00

19.0

0.0

4.0

0.0

1984

5.0

0.0

2.0

0.0

1985

63.5

0.57

42.0

0.01

47.0

0.22

37.5

0.02

Hay Lakes

1983

13.0

1.00

39.0

0.16

25.0

0.24

40.0

0.41

1984

4.5

0.0

13.0

<0.01

67.5

0.20

28.0

0.08

Holden

1983

28.0

0.28

Inchkeith

1984

1985

12.0

1.00

22.5

0.01

26.0

0.01

Leask

1984

11.0

1.00

9.0

0.0

1985

18.5

0.14

49.0

0.23

73.5

0.09

Moore Park

1983

5.0

0.0

55.0

0.53

1984

14.0

0.08

57.0

0.29

Penhold

1984

1985

67.0

1.0

Yorkton

1985

25.0

0.24

13.0

0.06

18.0

1.00

6.0

0.0

Cartwright

1983

25.0

1.00

17.5

0.13

Ceylon

1983

28.5

0.02

106

1,573.5

0.49

11.5

0.0

57.5

0.08

1984

17.0

0.12

190.5

0.07

16.0

0.01

Craik

1984

1985

30.0

0.31

10.5

<0.01

25.5

<0.01

10.0

0.0

Denzil

1984

6.0

<0.01

10.0

0.0

32.0

0.10

22.5

0.04

1985

14.0

0.08

45.0

0.46

21.5

.0.3

40.0

0.03

Gayford

1985

84.0

0.43

31.0

1.00

73.0

0.23

136.0

0.35

Goodwater

1983

20.5

<0.01

267.5

0.40

25.5

0.25

32.5

0.03

105.5

0.36

Shamrock

1982

25.5

0.25

393.2

0.37

82.0

0.42

72.2

0.23

14.0

0.08

1983

47.0

0.47

540.0

0.16

200.0

0.07

31.5

0.0

54.0

0.07

1984

28.0

<0.01

11.0

0.04

2.5

0.0

1985

18.0

1.00

26.5

0.26

4.0

0.0

27.5

0.27

32.0

1.00

Tichfield

1982

19.5

0.16

234.5

0.47

5.0

0.0

25.0

0.24

^aOdd area included patches of cover <2ha in size and an array of features usually found in Cropland (e.g., rock piles, gravel borrow pits, narrow borders of upland vegetation around Wetland and along fences between areas of Cropland).

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Factors Associated with Duck Nest Success
in the Prairie Pothole Region of Canada

Appendix E

Factors Associated with Duck Nest Success in the Prairie Pothole Region of Canada

Appendix E

Factors Associated with Duck Nest Success
in the Prairie Pothole Region of Canada