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1 August 2012 Small Population Size Of The Pribilof Rock Sandpiper Confirmed Through Distance-Sampling Surveys In Alaska
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The Rock Sandpiper (Calidris ptilocnemis) is endemic to the Bering Sea region and unique among shorebirds in the North Pacific for wintering at high latitudes. The nominate subspecies, the Pribilof Rock Sandpiper (C. p. ptilocnemis), breeds on four isolated islands in the Bering Sea and appears to spend the winter primarily in Cook Inlet, Alaska. We used a stratified systematic sampling design and line-transect method to survey the entire breeding range of this population during springs 2001–2003. Densities were up to four times higher on the uninhabited and more northerly St. Matthew and Hall islands than on St. Paul and St. George islands, which both have small human settlements and introduced reindeer herds. Differences in density, however, appeared to be more related to differences in vegetation than to anthropogenic factors, raising some concern for prospective effects of climate change. We estimated the total population at 19 832 birds (95% CI 17 853–21 930), ranking it among the smallest of North American shorebird populations. To determine the vulnerability of C. p. ptilocnemis to anthropogenic and stochastic environmental threats, future studies should focus on determining the amount of gene flow among island subpopulations, the full extent of the subspecies' winter range, and the current trajectory of this small population.

©2012 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website, reprintlnfo.asp.
Daniel R. Ruthrauff, T. Lee Tibbitts, Robert E. Gill, Maksim N. Dementyev, and Colleen M. Handel "Small Population Size Of The Pribilof Rock Sandpiper Confirmed Through Distance-Sampling Surveys In Alaska," The Condor 114(3), (1 August 2012).
Received: 15 July 2011; Accepted: 13 December 2011; Published: 1 August 2012

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