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Assessing Breeding Populations of Ducks by Ground Counts

Table 15

Table 15. Yearly trends of indicated breeding populations of dabblers and ponds from mid-May ground counts,Kindersley Study Area, 1956 to 1967.

May date	1956	1957	1958	1959	1960	1961	1962	1963	1964	1965	1966	1967
May date	14	13	10	15	11	10	17	15	10	14	14	20
Mallard	274	401	191	151	69	63	54	37	40	39	97	129
Pintail	193	315	161	47	37	40	40	19	19	60	132	139
Widgeon	75	80	35	37	34	33	19	6	12	23	39	57
Shoveler	31	59	35	27	20	5	12	20	16	32	50	51
Gadwall	63	38	25	16	17	8	13	8	14	16	26	50
Blue-winged teal	29	91	31	23	13	7	8	3	8	18	18	13
Green-winged teal	16	8	29	5	4	24	11	3	5	11	11	7
Total indicated pairs	681	992	507	306	194	180	157	96	114	199	373	446
Number of ponds on census date	81	43	29	22	30	33	35	11	17	59	51	49
Total pond acreage	609	479	227	155	162	158	174	82	115	618	550	571
Total pond shore line feet x 10³	115,	87,	58,	39,	45,	44,	51,	15,	22,	110,	99,	94,
Number of ponds, June 1	64	14	20	13	15	21*	26	8	9	49	42	43
Number of ponds, July 1	49	7	8	4	8	10*	15	4	3	38	30	24
*After 1961, estimated from May water depths, expected loss to july and general observations August 1-15. Note: Estimates accurate for mallards and pintails only, but show general trends for other species.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/duckcoun/table15.htm
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Page Last Modified: Friday, 01-Feb-2013 19:13:48 EST
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