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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	182^b
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
										hp^d
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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	174^b
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
										hp^d
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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	35^b
May 21	37	18								60	55
May 24	31	25								64	56
May 31	16	25								72	41
June 6	17	15								65	32
										hp^d
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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	35^b
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
										hp^d
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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	26^b
May 31	8	16								75	24
June 6	15	12								64	27
June 12	10	6	1	1						68	21
										hp^d
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						Other^a	Drakes as % all birds	Indicated population
Date	Pairs	Lone drake	2	3	4	5	6 - 10	10+	Other^a	Drakes as % all birds	Indicated population
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	35^b
May 31	13	17			1				10:4	71	34
June 6	5	27	6							90	44
June 12	6	14	1							79	22
										hp^d
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.