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Assessing Breeding Populations of Ducks by Ground Counts

Table 8


Table 8a. Seasonal census of mallards on Kindersley Study Area, 1958.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 33 2 1             52 37
Apr. 12 116 6 1             52 124
Apr. 19 135 17 0 1           53 155
Apr. 24 96 62 6 4           66 182b
Apr. 29 71 69 13 1 3   1(6)c     73 187
May 3 49 64 24 6 1 3       80 198
May 10 35 55 19 11 2 3 1(7)     85 191
May 21 52 49 27 13 2 2 1(9)     81 212
                    hpd  
May 24 48 72 21 17 3 1 1(8)   3:1 83 230
May 31 24 47 14 7 3 3 5(35) 4(109) 9:9 90 147
June 6 31 18 6 5 0 1 6(47) 2(39) 19:19 87 81
June 12 12 10 6 1 0 0 2(13) 3(70) 19:19 82 37
June 20 4 3 0 0 0 1 1(6) 1(15) 9:17 67 12
June 26 1 4 1 0 1 0 2(15) 1(14 10:24 67 11
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
cFigures in brackets give exact number of grouped birds.
dhp = hatching peak.

Table 8b. Seasonal census of pintails on Kindersley Study Area, 1958.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 63 8 1 1           55 76
Apr. 12 84 17 1             55 103
Apr. 19 112 21               54 133
Apr. 24 89 46 2 0 1 1 1(6)c   20:4 65 174b
Apr. 29 49 76 6 5 1 1 1(6)   5:1 78 172
May 3 53 55 13 4 0 2     25:3 76 181
May 10 36 45 11 8 3 2 1(7)   6:1 81 162
May 21 37 39 11 4 5 4 1(9)   3:1 81 150
                    hpd  
May 24 36 43 10 10 4 3     7:2 82 160
May 31 21 22 7 6 4 2 4(32) 4(97) 18:13 88 101
June 6 20 14 2 0 1 0 1(6) 2(53) 28:9 82 42
June 12     1       1(8) 1(11) 3:3 89 2
June 20     1 0 1 0       -- 6
June 26       1     3(20)     100 3
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
cFigures in brackets give exact number of grouped birds.
dhp = hatching peak.

Table 8c. Seasonal census of widgeon on Kindersley Study Area, 1958.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 1                 -- 1
Apr. 12 15 2   1           57 20
Apr. 19 43 7               54 50
Apr. 24 62 5             7:1 54 74
Apr. 29 62 2               52 64
May 3 76 5               52 81
May 10 31 4               53 35b
May 21 37 18               60 55
May 24 31 25               64 56
May 31 16 25               72 41
June 6 17 15               65 32
                    hpd  
June 12 8 12 1 1 1         78 29
June 20 4 2 0 1       1(11)c   83 9
June 26 0 0 1 1     1(6)   4:1 -- 5
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
cFigures in brackets give exact number of grouped birds.
dhp = hatching peak.

Table 8d. Seasonal census of shoveler on Kindersley Study Area.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 1                 -- 1
Apr. 12 0                 -- 0
Apr. 19 10 2               55 12
Apr. 24 32 3             4:1 54 39
Apr. 29 25 2               42 27
May 3 29 8               56 37
May 10 27 8               56 35b
May 21 24 16               63 40
May 24 13 13   1     1(6)c     73 35
May 31 7 23               81 30
June 6 6 16 1 2         3:1 75 30
                    hpd  
June 12 1 15 1 1           95 21
June 20 5 5         1(7)     77 10
June 26 0 0             5:1 -- 0
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
cFigures in brackets give exact number of grouped birds.
dhp = hatching peak.

Table 8e. Seasonal census of gadwall on Kindersley Study Area, 1958.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 --                    
Apr. 12 --                    
Apr. 19 3                 -- 3
Apr. 24 9 1               53 10
Apr. 29 6                 50 6
May 3 17 1               51 18
May 10 24 1               51 25
May 21 36 6               54 42
May 24 22 4               54 26b
May 31 8 16               75 24
June 6 15 12               64 27
June 12 10 6 1 1           68 21
                    hpd  
June 20 4 5 1 1           78 14
June 26       1 1   1(10)c   2:2 90 7
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
cFigures in brackets give exact number of grouped birds.
dhp = hatching peak.

Table 8f. Seasonal census of blue-winged teal on Kindersley Study Area.
Date Pairs Lone drake Group sizes of drakes
Number of groups
Othera Drakes as % all birds Indicated population
2 3 4 5 6 - 10 10+
Apr. 4 --                    
Apr. 12 --                    
Apr. 19 --                    
Apr. 24 3 1               -- 4
Apr. 29 --                    
May 3 7 1               53 8
May 10 27 4               53 31
May 21 12 9 1             66 23
May 24 14 21               71 35b
May 31 13 17     1       10:4 71 34
June 6 5 27 6             90 44
June 12 6 14 1             79 22
                    hpd  
June 20 3 6               75 9
June 26 2 4   1 2         89 17
For all tables 8a to 8f.
aBreeding birds in attempted rape flights or postbreeding groups given as a ratio, drakes:hens.
bOptimum census period, i.e., when population reaches a plateau and is fairly stable.[Indicated by bold numbers]
dhp = hatching peak.

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