. The Canadian field-naturalist. 1975 Fritzell: Agricultural Burning and Nesting Waterfowl 23 Chronology of Burning The timing of burning and of nest initiation for an early-nesting species, the Mallard (Anas platyrhynchos), and a late-nesting species, the Blue-winged Teal {Anas discors), in 1970 are compared in Figure 1. The extremely late spring ill 1970 delayed breeding as well as burning activity. Comparable data for 1971 are presented in Figure 2. During the study, most burning occurred after the peak of first nest initiation by Mal- lards and Pintails {Anas acuta), and before most Blue-w
. The Canadian field-naturalist. 1975 Fritzell: Agricultural Burning and Nesting Waterfowl 23 Chronology of Burning The timing of burning and of nest initiation for an early-nesting species, the Mallard (Anas platyrhynchos), and a late-nesting species, the Blue-winged Teal {Anas discors), in 1970 are compared in Figure 1. The extremely late spring ill 1970 delayed breeding as well as burning activity. Comparable data for 1971 are presented in Figure 2. During the study, most burning occurred after the peak of first nest initiation by Mal- lards and Pintails {Anas acuta), and before most Blue-winged Teal nesting activity. It ap- pears that early-nesting ducks are more suscep- tible to destruction of nests by fire than later- nesting species. Mallards often prefer heavy, rank growth as nest sites, and Pintails often nest in stubble fields (Milonski 1958). Because BURNING MALLARD BLUE-WINGED TEAL. 30 7 14 21 28 4 II 18 25 2 9 16 23 APRIL MAY JUNE JULY WEEK ENDING Figure 1. Chronology of burning and nest initiation of Mallards and Blue-winged Teal, 1970. BURNING MALLARD BLUE^WINGED TEAL. 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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