. The Canadian field-naturalist. 1993 Sanders: Spring Migration Routes of Common Loons 197 LAKE SUPERIOR 10 20 30. Figure 1. Map of the Sault Ste. Marie region of the Great Lakes, showing the location of the observation sites from which loon migration was recorded. See Table 3 for names corresponding to the abbreviations. breeding plumage, with the exception of four loons passing Gros Cap in 1990 and three flying up the St. Mary's River past Sault Ste. Marie in 1992, which were identified as Red-throated Loons. Of 4838 loons recorded by Ewert (1982) passing Whitefish Point in 1982, only 18 wer
. The Canadian field-naturalist. 1993 Sanders: Spring Migration Routes of Common Loons 197 LAKE SUPERIOR 10 20 30. Figure 1. Map of the Sault Ste. Marie region of the Great Lakes, showing the location of the observation sites from which loon migration was recorded. See Table 3 for names corresponding to the abbreviations. breeding plumage, with the exception of four loons passing Gros Cap in 1990 and three flying up the St. Mary's River past Sault Ste. Marie in 1992, which were identified as Red-throated Loons. Of 4838 loons recorded by Ewert (1982) passing Whitefish Point in 1982, only 18 were Red-throated Loons, and of 1150 Common Loons, for which plumage charac- teristics could be seen, all but 29 were in breeding plumage. Times of flight Sunrise at Sault Ste. Marie on 5 May is about 05:20, on 10 May, 05:15. Given that civil twilight extends daylight for a further 38 minutes at this time of year, there is enough light at 05:00 to see flying loons and in most years the first loons were seen as soon as there was sufficient light to detect them. Numbers peaked during the second hour of daylight, between 06:00 and 07:00 (Table 2), which is about 1 h earlier than at Whitefish Point, 60 km further west (Ewert 1982). On five of the observation-days most of the loons passed between 06:00 and 08:00. On the other three days (1985, 1988 and 1992), some loons passed through well into the afternoon. On these days the distribution was distinctly bimodal, with a first peak between 06:00 and 06:30, and a sec- ond between 08:30 and 09:00, which suggests that there were two waves of migrants (Table 2). During fall migration loons congregate on the waters of both Lakes Huron and Michigan in sizable flocks or "rafts" (Mclntyre 1988), but there are no. 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 Otta
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