. The Canadian field-naturalist. (b) Nonbreeding pairs Breeding pairs. 26 28 30 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 April May Figure 3. Attendance patterns during the pre-laying period in 1977: (a) proportions of total breeding and nonbreeding site holders present (two birds per site counted as 100% attendance) and (b) percentage of occupied sites containing 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 Ottaw


. The Canadian field-naturalist. (b) Nonbreeding pairs Breeding pairs. 26 28 30 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 April May Figure 3. Attendance patterns during the pre-laying period in 1977: (a) proportions of total breeding and nonbreeding site holders present (two birds per site counted as 100% attendance) and (b) percentage of occupied sites containing 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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