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Techniques for Studying Nest Success of Ducks in Upland Habitats in the Prairie Pothole Region


List of Figures


Figure 1 -- A crew of two drivers and a spotter search for duck nests with a cable-chain drag. JPEG (37K) -- GIF (111K)

Figure 2 -- Diagrammatic search pattern of a hypothetical field. GIF (16K)

Figure 3 -- Examples of a proper and improper interval and alignment while towing a cable-chain drag in field searches. GIF (9K)

Figure 4 -- Proper positioning of a duck egg for field candling is demonstrated. JPEG (12K) -- GIF (74K)

Figure 5 -- Characteristics of duck eggs candled during different stages of incubation. GIF (29K)

Figure 6 -- Detached membranes are visible in these hatched eggs. JPEG (18K) -- GIF (109K)

Figure A-1 -- Examples of distinguishing breast feathers of 10 species of ducks found nesting in uplands in the prairie pothole region:

Mallard -- JPEG (7K) -- GIF (53K)
Northern pintail -- JPEG (7K) -- GIF (53K)
Gadwall -- JPEG (5K) -- GIF (43K)
American wigeon -- JPEG (6K) -- GIF (53K)
Northern shoveler -- JPEG (5K) -- GIF (42K)
Blue-winged teal -- JPEG (5K) -- GIF (38K)
Green-winged teal -- JPEG (4K) -- GIF (40K)
Lesser scaup -- JPEG (4K) -- GIF (36K)
Redhead -- JPEG (5K) -- GIF (44K)
Canvasback -- JPEG (5K) -- GIF (43K)
Figure B-1 -- Sample nest record. GIF (35K)

Table 1 -- Percent of nests found in south-central North Dakota in 1976 using varying numbers and timing of search schedules. GIF (6K)

Table B-1-- Mean values for clutch sizes, incubation terms, and age of clutches. GIF (6K)

Table B-2 -- Computation of exposure days for nests with different survival and visitation intervals. GIF (8K)

Table B-3 -- Three methods for calculating nest success. GIF (8K)

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