. The Canadian field-naturalist. 492 The Canadian Field-Naturalist Vol. 105 Tabll 5. Number of broods classified in various age groups after Taber (1971) in 1976 during the 26-28 July survey (regu- lar numbers) ;md the 14-18 August survey (number in parentheses). I AGE CLASS U A B C A B C (0- 1 week)' (1 •2 weeks) (2-3 weeks) (3- 4 weeks) (4- 5 wee ks) (5 6 weeks) Canada Goose 0 7 38 (12) (22) 0 Black Duck 0 0 0 3 0 (1) Greater Scaup 1 1(2) (1) (2) 0 0 Surf Scoter 1 8 5(5) (8) (1) 0 Black Scoter 3 13 3(6) (15) (2) 0 MerganMjr 10 8(9) (13) (8) 0 0 Values based on Lesser Scaup. Exact age represe
. The Canadian field-naturalist. 492 The Canadian Field-Naturalist Vol. 105 Tabll 5. Number of broods classified in various age groups after Taber (1971) in 1976 during the 26-28 July survey (regu- lar numbers) ;md the 14-18 August survey (number in parentheses). I AGE CLASS U A B C A B C (0- 1 week)' (1 •2 weeks) (2-3 weeks) (3- 4 weeks) (4- 5 wee ks) (5 6 weeks) Canada Goose 0 7 38 (12) (22) 0 Black Duck 0 0 0 3 0 (1) Greater Scaup 1 1(2) (1) (2) 0 0 Surf Scoter 1 8 5(5) (8) (1) 0 Black Scoter 3 13 3(6) (15) (2) 0 MerganMjr 10 8(9) (13) (8) 0 0 Values based on Lesser Scaup. Exact age representing the age classes, varies with species. grounds. Consequently, high numbers observed on the coast in July and August are probably due to the presence of molting males. Coastal areas of James Bay. Hudson Bay, Ungava Bay and Labrador are used by scoters for molting. For example, Ross (1983) estimated that 90 000 Black Scoters molted in the James Bay area. Breeding Density of Scoters Both Black and Surf Scoters bred in relatively high densities in the Lake Bienville area. Unfortunately, our transect design did not allow us to estimate the precision of our counts, thus our comparisons are limited to the area surveyed. White- winged Scoters were observed occasionally, but only one brood was seen over four years of surveys (Bider and Lamothe 1982). This represented the first documented breeding by this species east of Manitoba. Review of other estimates of density for Scoters point to Lake Bienville as a significant area for Surf and Black scoters (Tables 6-7. Figure 3). However, only a small portion of northern Quebec has been adequately surveyed to date. In Labrador. Percentage of time N= hours. 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-Natural
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