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Abstract
Western Sandpipers Calidris mauri are differential migrants on their non-breeding areas, with females wintering farther south. Earlier passage of males in the spring has been explained by sexual differences in winter latitude (male-biased sex ratios at more northerly areas) and onset of migration (males departing earlier). We investigated sex differences during spring migration by capturing and radio-marking Western Sandpipers at two Pacific coast sites, San Francisco Bay, California and Grays Harbor, Washington and at a Great Basin interior wetland, Honey Lake, California. We monitored northward migration of 132 radio-marked birds at a network of 12 major stopover sites and 4 breeding areas. At the banding sites, we observed differences in sex by date and site, with males preceding females. We found sex differences in departure time of radio-marked birds from the banding site. their arrival time at the Copper River Delta, Alaska (our most frequently used stopover site), and in the likelihood that a stopover was used. Our data suggest that by mid to late April, migration timing becomes more compressed and sex differences are less pronounced and harder to detect.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Differential spring migration by male and female Western Sandpipers at interior and coastal stopover sites |
| Series title | Ardea |
| Volume | 92 |
| Issue | 2 |
| Year Published | 2004 |
| Language | English |
| Publisher | Netherlands Ornithologists' Union |
| Contributing office(s) | Western Ecological Research Center |
| Description | 12 p. |
| First page | 185 |
| Last page | 196 |
| Google Analytic Metrics | Metrics page |