Ydenberg Ronald C, Niehaus Amanda C, Lank David B
Centre for Wildlife Ecology, Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada.
Naturwissenschaften. 2005 Jul;92(7):332-5. doi: 10.1007/s00114-005-0637-x. Epub 2005 May 19.
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.
在滨鹬亚科的鹬类中，父母一方会缩短育雏期，并在另一方之前开始向南迁徙。我们估算了1978年至2000年这18年间，从阿拉斯加繁殖地向南迁徙的西部滨鹬（Calidris mauri）在其首个主要中途停歇地时，雄性和雌性之间的通过日期差异。总体而言，成年雌性比成年雄性提前1.22天。一个新发现是，在比成年鸟大约晚一个月迁徙的幼鸟中，雌性比雄性也提前了相近的天数（1.14天）。然而，年份之间存在很大差异，在孵化较晚的年份，雄性实际上比雌性提前。我们将这些发现与关于鹬类雌性先于雄性向南迁徙的假说联系起来。
