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Distribution and Abundance of Predators that Affect
Duck Production: Prairie Pothole Region

Appendix

Table 12. Number of occupied incidentally found nests of black-billed magpies and densities of occupied nests of American crows found in all wooded habitat during complete searches of study areas in the prairie pothole region, 1983-88.

Area^a			Year	Black-billed Magpie	American Crow
Area^a			Year	Found Nests	Searched Quarter Sections	Found Nests	Nest/10 km^2b
Canada
	Alberta
		Gayford	1985	0	40	15	5.8
		Hay Lakes*	1983	0	-	3^c	(2.6)
		Hay Lakes*	1984	1	40	11	4.3
		Holden*	1983	1	-	8^c	(16.6)
		Penhold*	1984	4	40	19	7.3
		Penhold*	1985	4	35	5	2.2
	Manitoba
		Cartwright	1983	1	-	1^c	(2.8)
		Moore Park*	1983	0	-	1^c	(4.7)
		Moore Park*	1984	5	40	6	2.3
	Saskatchewan
		Ceylon	1983	0	-	4^c	(0)
		Ceylon	1984	0	39	2	0.8
		Craik	1984	5	38	15	6.1
		Craik	1985	0	40	13	5.0
		Denzil	1984	5	40	11	4.3
		Denzil	1985	3	40	18	7.0
		Earl Grey*	1985	2	40	9	3.5
		Goodwater	1983	0	-	2^c	(0.9)
		Hanley*	1983	5	-	11^c	(17.7)
			1984	9	39	40	15.8
			1985	0	40	49	18.9
		Inchkeith*	1984	6	40	13	5.0
		Inchkeith*	1985	8	38	9	3.7
		Leask*	1984	0	21	6	4.4
		Leask*	1985	2	40	18	6.9
		Shamrock	1983	0	-	1^c	(0)
			1984	0	40	10	3.9
			1985	0	40	9	3.5
		Yorkton*	1985	2	40	10	3.9
United States
	Minnesota
		Hawley*	1987	0	35	0^d	0
		Hawley*	1988	0	33	2	0.9
		Hitterdal*	1988	0	33	1	0.5
		Lake Park*	1987	0	30	0^e	0
		Lake Park*	1988	0	33	1	0.5
	Montana
		Morgan	1983	0	-	-	(0)
		Plentywood	1983	0	-	-^f	(0)
	North Dakota
		Courtenay	1988	0	36	0	0
		Eldrige	1987	0	36	0	0
		Eldrige	1988	0	35	0	0
		Fredonia	1987	0	36	0	0
		Fredonia	1988	0	36	0	0
		Jud	1987	0	36	1	0.4
		Jud	1988	0	32	0	0
		Kulm	1988	0	36	0	0
		Litchville	1987	0	36	0	0
		Litchville	1988	0	36	0	0
		Plaza	1983	0	-	-	(0)
		Sharon	1983	0	-	-	(0)
		Streeter	1983	0	-	-	(0)
	South Dakota
		Hosmer	1983	0	-	-	(0)
		Madison	1983	0	-	-	(0)
		Parkston	1983	0	-	-	(0)

^aStudy areas denoted with an (*) asterisk are in the aspen parkland, all others are in the prairie.
^bEstimates (in parentheses) were made with data from road-transect counts (Appendix Table 4) and based on the correlation (r=0.84) between numbers of located nests and average percentage of quarter sections in which American crows were detected in study areas in Canada during 1984 and 1985.
^cSearches for American crow nests were incomplete.
^dOne occupied nest was thought to have been present.
^eThree occupied nests were thought to have been present.
^fOne occupied American crow nest was found incidentally in this study area; no occupied American crow nests were found in any other Central Flyway study area.

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Distribution and Abundance of Predators that Affect Duck Production: Prairie Pothole Region

Appendix

Distribution and Abundance of Predators that Affect
Duck Production: Prairie Pothole Region