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1 March 2010 Natal Philopatry and Apparent Survival of Juvenile Semipalmated Plovers
Erica Nol, Simone Williams, Brett K. Sandercock
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Abstract

Natal philopatry is rare in long-distance migrant shorebirds and requires long-term population studies to detect. We report on the rate of natal philopatry from a 18-year study of Semipalmated Plovers (Charadrius semipalmatus) marked as hatchlings to an arctic breeding site near Churchill, Manitoba. About 2% (27/1271) of banded hatchlings returned to the Churchill area to breed. There was no male/female bias in rates of philopatry: 17 male and 10 female hatchlings recruited into the local breeding population. The annual rate of recruitment of hatchlings varied between 0 and 10.7%. Age of first encounter on breeding areas ranged from 1 to 8 years (median age 4) suggesting either unusually delayed age at first breeding, or low detection rates for philopatric hatchlings. The maximum age of a recruited (known-age) hatchling was 9 years. Natal dispersal distances did not differ between males and females, and averaged 5 km between hatching and breeding locations. We used a time-since-marking mark-recapture model to calculate apparent survival of hatchlings. Apparent survival in the interval after first capture was φ1  =  0.0475 (95% CI: 0.030–0.075), whereas apparent survival (φ2 ) of birds during subsequent intervals was 0.866 (95% CI: 0.764–0.927). Low rates of natal philopatry suggest little advantage to site familiarity for juveniles, and agree with theoretical predictions for migratory species with widespread habitat availability.

Erica Nol, Simone Williams, and Brett K. Sandercock "Natal Philopatry and Apparent Survival of Juvenile Semipalmated Plovers," The Wilson Journal of Ornithology 122(1), 23-28, (1 March 2010). https://doi.org/10.1676/09-097.1
Received: 15 June 2009; Accepted: 1 October 2009; Published: 1 March 2010
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