Publication Type: | Journal Article |
Year of Publication: | 2010 |
Authors: | Johnson, M, Ruthrauff, DR, McCaffery, BJ, Haig, SM, Walters, JR |
Journal: | The Wilson Journal of Ornithology |
Volume: | 122 |
Issue: | 1 |
Date Published: | 2010 |
ISBN Number: | 1559-4491 |
Keywords: | Calidris, Calidris mauri, Scolopacidae, Xenus, Xenus cinereus |
Abstract: | Abstract We used 8 years of live recapture data (1998?2005) to estimate apparent annual survival for male (n ?=? 237) and female (n ?=? 296) Western Sandpipers (Calidris mauri) breeding on a 36-ha plot on the Yukon-Kuskokwim River Delta, western Alaska. Apparent annual survival (Φ) is the product of true survival and site fidelity, and estimates of Φ were corrected for the probability of encounter. Overall return rates (individual returned to the study site in a subsequent season) were lower for females (40%) than males (65%), as was Φ (± SE, females ?=? 0.65 ± 0.05, males ?=? 0.78 ± 0.03), and encounter rate (females ?=? 0.51 ± 0.07, males ?=? 0.74 ± 0.04). Results differed from previous estimates of Φ for this species as our estimates of Φ were higher for both males and females compared to estimates from another breeding site and two nonbreeding locations. Disparity among Φ estimates from breeding and nonbreeding areas highlights the need to delineate site-specific factors throughout the annual cycle that influence population dynamics of the Western Sandpiper.Abstract We used 8 years of live recapture data (1998?2005) to estimate apparent annual survival for male (n ?=? 237) and female (n ?=? 296) Western Sandpipers (Calidris mauri) breeding on a 36-ha plot on the Yukon-Kuskokwim River Delta, western Alaska. Apparent annual survival (Φ) is the product of true survival and site fidelity, and estimates of Φ were corrected for the probability of encounter. Overall return rates (individual returned to the study site in a subsequent season) were lower for females (40%) than males (65%), as was Φ (± SE, females ?=? 0.65 ± 0.05, males ?=? 0.78 ± 0.03), and encounter rate (females ?=? 0.51 ± 0.07, males ?=? 0.74 ± 0.04). Results differed from previous estimates of Φ for this species as our estimates of Φ were higher for both males and females compared to estimates from another breeding site and two nonbreeding locations. Disparity among Φ estimates from breeding and nonbreeding areas highlights the need to delineate site-specific factors throughout the annual cycle that influence population dynamics of the Western Sandpiper. |
URL: | http://dx.doi.org/10.1676/09-089.1 |
Short Title: | The Wilson Journal of Ornithology |
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