APPARENT SURVIVAL OF BREEDING WESTERN SANDPIPERS ON THE YUKON-KUSKOKWIM RIVER DELTA, ALASKA

作者：Johnson Matthew^*; Ruthrauff Daniel R; McCaffery Brian J; Haig Susan M; Walters Jeffrey R

来源：The Wilson Journal of Ornithology, 2010, 122(1): 15-22.

DOI：10.1676/09-089.1

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 (Phi) is the product of true survival and site fidelity, and estimates of Phi 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 Phi (+/- 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 Phi for this species as our estimates of Phi were higher for both males and females compared to estimates from another breeding site and two nonbrceding locations. Disparity among Phi 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. Received 30 May 2009. Accepted 9 October 2009.

• 出版日期2010-3