AVIS-IBIS

Birds of Indian Subcontinent

Apparent Survival of Breeding Western Sandpipers on the Yukon-Kuskokwim River Delta, Alaska

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
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith