Migration Chronology, Length of Stay, Sex-Ratio, and Weight of Western Sandpipers, (Calidris-Mauri) on the South Coast of British-Columbia

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[edit] Author(s)

  • Butler, R. W.
  • Kaiser, G. W.
  • Smith, G. E. J.

[edit] Journal

Journal of Field Ornithology 58.2 (1987): 103-11.

[edit] Keywords

[edit] Abstract

In 1978-1980 and 1985-1986, we banded, weighed, and measured 2660 Western Sandpipers (Calidris mauri) at 2 sites in south coastal British Columbia. Adults migrated north between mid-April and mid-May, and south between late June and late July. Most juveniles migrated south after the adults, between late July and early October. Adult males mostly migrated ahead of females in spring and after them in fall, whereas juveniles showed no sexual segregation. Migrants of both sexes were heavier in spring than fall and females outweighed males regardless of time of year, age, or standardized body size. Body weights of adults tended to increase as migration proceeded. We estimated the length-of-stay during migration at about 1-3 d for adults in autumn.

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