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- W2529809435 abstract "-We banded, weighed, and measured 2147 Least Sandpipers (Calidris minutilla) migrating across the Fraser River delta in 1977-1987 and Sidney Island in 1990-1993. The adult migration from late June to early August overlapped the juvenile migration between late July and late September. The mean body mass of adult females on their northward migration was not significantly greater than on their southward migration. Samples sizes of northward migrating males were too small to draw similar comparisons. Adults were not significantly heavier than juveniles on the southward migration. Mean body masses were greatest in the third week of July among adults and in the third week of August among juveniles. The average length of stay during migration was estimated to be about five days in autumn. Received 24 Aug. 1994, accepted 10 Feb. 1995. The Least Sandpiper (Calidris minutilla) is one of the most numerous shorebird species on the Pacific Coast of North America during migration (Jewett et al. 1953, Page et al. 1979, Butler and Campbell 1987, Butler 1994). Its breeding range extends across the boreal forests and southern tundra of North America (Miller 1986, Cooper 1994). Small numbers breed on the Queen Charlotte Islands and in northwestern British Columbia (Campbell et al. 1990, Cooper 1993), but the majority of western populations of Least Sandpipers breed farther north in Alaska and Yukon (Godfrey 1986, Hayman et al. 1986). During the winter, Least Sandpipers are found along the Pacific coast from southern Washington to southern Peru (Hayman et al. 1986, Paulson 1993). Information is available on the seasonal occurrence, habitat use, and body mass of Least Sandpipers migrating in Ontario and Venezuela and on the winter quarters in California (Page and Bradstreet 1968, Page and Salvadori 1969, Bradstreet et al. 1977, Page et al. 1979, Thomas 1987). However, this information is lacking during migration along the north Pacific Coast. This paper describes the timing of the southward migration, body mass of age and sex classes, and the length of stay of Least Sandpipers in southwestern British Columbia. METHODS AND STUDY AREA We studied migrant Least Sandpipers on the Fraser River delta (49°05'N, 123°00'W) and on Sidney Island (48°40'N, 123°20'W) in extreme southwestern British Columbia. The Fra' Pacific Wildlife Research Centre, Canadian Wildlife Service, 5421 Roberston Rd., RR 1, Delta, B.C. V4K 3N2, Canada." @default.
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- W2529809435 date "1995-01-01" @default.
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- W2529809435 title "Migration Chronology, Sex Ratio, and Body Mass of Least Sandpipers in British Columbia" @default.
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