Interannual differences in the relative timing of southward migration of male and female western sandpipers (Calidris mauri)

R.C. Ydenberg, A.C. Niehaus, D.B. Lank

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

In the shorebird subfamily Calidridinae, one of the parents shortens parental care and initiates southward migration before the other. We estimated the difference in passage date between male and female western sandpipers (Calidris mauri) at their first major stopover on the southward migration from breeding areas in Alaska, in 18 years between 1978 and 2000. Overall, adult females preceded adult males by 1.22 days. A novel finding was that among juveniles, which migrate approximately a month later than adults, females preceded males by similar magnitude (1.14 days). There was wide variation among years, however, and males actually preceded females in years with late hatch. We relate these findings to hypotheses for female-first southward migration in sandpipers.
Original languageEnglish
Pages (from-to)332-335
JournalNaturwissenschaften
Volume92
Issue number7
DOIs
Publication statusPublished - 2005

Keywords

  • sexual selection
  • british-columbia
  • arrival times
  • parental care
  • chronology
  • evolution
  • ratio

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