Local Recruitment and Natal Dispersal Distances of American Kestrels

The condor

Karen Steenhof¹ 

关键词: American Kestrel;    dispersal;    Falco sparverius;    recruitment;   

DOI  :  10.1525/cond.2013.120006

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. Variation in recruitment patterns and dispersal behavior can have important consequences for population viability, genetic structure, and rates of evolutionary change. From 1992 to 2006 we studied a marked population of American Kestrels (Falco sparverius) nesting in boxes in southwestern Idaho to identify factors that affect local recruitment and natal dispersal distances. A low proportion (4%) of locally produced kestrels (n = 2180) returned to nest in study area boxes. Offspring of locally produced individuals were 3.1 times more likely to return than offspring of parents that did not hatch in study area boxes and, independent of a parent's origin, males were 1.8 times more likely than females to return. Kestrels that hatched earlier in the breeding season and those that hatched immediately prior to a mild winter were more likely to return. Local natal dispersal distances were best explained by sex and parental origin but not by hatching dates. Fifty-four males moved an average of 5.3 km from...

【 授权许可】

CC BY