. The Canadian field-naturalist. 1966 Townsend: Waterfowl Nesting 75. Figure 1. Map of study area. Dotted areas were searched for nests. Inset at lower right shows Egg Lake in relation to other lakes on the lease. The present investigation was financed by Ducks Unlimited (Canada) and tiie University of Wisconsin. C. H. Moulder conducted a major part of the nest searching in 1963. Thanks are due J. R. H. Noble, who supplied unpub- lished climatic averages for Cumberland House. I am indebted to R. A. McCabe, J. J. Hickey, L. B. Keith, and W. G. Leitch for critical advice. Methods Intensive nest
. The Canadian field-naturalist. 1966 Townsend: Waterfowl Nesting 75. Figure 1. Map of study area. Dotted areas were searched for nests. Inset at lower right shows Egg Lake in relation to other lakes on the lease. The present investigation was financed by Ducks Unlimited (Canada) and tiie University of Wisconsin. C. H. Moulder conducted a major part of the nest searching in 1963. Thanks are due J. R. H. Noble, who supplied unpub- lished climatic averages for Cumberland House. I am indebted to R. A. McCabe, J. J. Hickey, L. B. Keith, and W. G. Leitch for critical advice. Methods Intensive nest searching was begun on 27 May 1963 and 25 May 1964. Two or three persons, walking abreast 20-40 feet apart, searched through the wet quaking marsh attempting to flush nesting ducks. Searching was confined to the morning hours, at a time when a high percentage of laying hens are found on their nests (Mendall, 1958; Sowls, 1955). Most nests, however, were discovered in the early stages of incubation, rather than during laying. An effort was made in approaching nests to disturb the surrounding cover as little as possible. Each nest was identified bv number and marked for sub- sequent visits with a tuft of sedge tied to a nearby willow. Nests were re- visited every 7-10 days. Individual nest histories were coded for data processing, and the com- puting facilities of the University of Wisconsin College of Agriculture were used in data analysis. Reference was made to Dixon and Massey (1957) and Steele and Torrie (1960) for statistical tests and tables of significance. Confid- ence limits, unless otherwise stated, are at the 95 per cent level of significance throughout the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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