Correlates of postfledging survival, the timing of dispersal, and local recruitment in American Dippers
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| Authors: | Middleton, HA; Green, DJ |
| Year: | 2008 |
| Journal: | Canadian Journal of Zoology-Revue Canadienne de Zoologie 86: 875-881 Article Link (DOI) |
| Title: | Correlates of postfledging survival, the timing of dispersal, and local recruitment in American Dippers |
| Abstract: | Natal dispersal is a complex process that involves decisions about when to leave the natal territory, how to move through the landscape, and where to settle. We investigated what factors influence the timing of dispel-Sal and local recruitment of American Dippers (Cinclus mexicanus Swainson, 1827) in Chilliwack, British Columbia. We monitored 102 fledglings from 30 broods between 2003 and 2005. Survival to 5 days after fledging was high (>80%), but individuals fledging early in the season and at an older age had higher Survival than those fledging later and younger. Fifty-four percentage of Surviving fledglings dispersed within 14 days of nest departure. Females and individuals that spent more time foraging were more likely to disperse within 14 days than males and individuals that foraged less. For those that dispersed, individuals that fledged early in the season and at older ages spent less time in their natal territory. Approximately 10% (10/82) of dispersing individuals were known to recruit locally. Local recruitment of individuals that delayed dispersal was higher than local recruitment of individuals dispersing early. Our Study demonstrates that fitness benefits associated with extended natal philopatry are not restricted to cooperatively breeding birds. |
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