. The Canadian field-naturalist. 24 The Canadian Field-Naturalist Vol. 103. Figure 1. Map showing the location of the study site, the Beauharnois power dam in southwestern Quebec. Counts were analysed using five-day periods (73) of the calendar year. Mean dates were calculated using all dates for all years. Results The following annotated list includes all species seen at the site from July 1967 to 27 December 1980. The species sequence follows the (1983) check-list. Data of peak migration times for the eight most common species are shown graphically in Figure 2. Species data are summar
. The Canadian field-naturalist. 24 The Canadian Field-Naturalist Vol. 103. Figure 1. Map showing the location of the study site, the Beauharnois power dam in southwestern Quebec. Counts were analysed using five-day periods (73) of the calendar year. Mean dates were calculated using all dates for all years. Results The following annotated list includes all species seen at the site from July 1967 to 27 December 1980. The species sequence follows the (1983) check-list. Data of peak migration times for the eight most common species are shown graphically in Figure 2. Species data are summarized in Table 1. Pomarine Jaeger, Stercorarius pomarinus. One adult dark phase bird 1-6 November 1979. Parasitic Jaeger, Stercorarius parasiticus. Two immatures 20 November 1976, one 11-12 November 1978, and one 1 November 1979. Laughing Gull, Larus atricilla. One adult 1 September 1969, one sub-adult 1-3 September 1969, one adult 4 October 1970, one immature 13 May 1976, one immature (photographed) 23 October-13 November 1977, one adult in winter plumage (photographed) 4-11 November 1979, and one first-winter 11-23 November 1980. Franklin's Gull, Larus pipixcan. One sub- adult 26 September 1970, one immature 5 October 1974, one adult in summer plumage 20 July 1976, one adult (photographed) 17 August 1980, and one adult 23 November 1980. Little Gull, Larus minutus. Migrant in small numbers in most years. First recorded 17 August- 13 September 1969; two adults. Not recorded in 1970 or 1971 but recorded with increasing frequency 1972-80. There were over 64 reports involving over 168 individuals. The largest day count was seven and the mean (N = 37) was three birds. Recorded on spring migration in three years and in autumn in ten years. Earliest spring report 10 May and the latest 28 May. Mean dates for autumn were 14 August to 19 September with the latest 2 November. The majority of adults and immatures occurred August to November with the earliest 14 July and latest 2 November.
Size: 1972px × 1267px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
