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1 January 2009 Staging Behavior in Red KNOT (Calidris Canutus) in Delaware BAY: Implications for Monitoring Mass and Population Size
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Many migratory birds use staging sites to gain essential resources to fuel their ongoing migration. Understanding staging strategies reveals much about migration systems and is essential if one is concerned with monitoring population trends and mass gains, two of the principal methods for assessing the “health” of a migratory population. In spring 2004, we investigated the staging behavior in Delaware Bay of Red Knot (Calidris canutus) using mark-recapture techniques and resightings of birds marked in the preceding spring. Individuals staged for 11–12 days, which declined to 8–10 days late in the season. Arrivals were asynchronous, but departures tended to be synchronized. A simple sensitivity analysis showed that the mark-recapture analysis estimated length of stay to within 10% and confirmed biases in monitoring trends and mass gains using peak counts and mass-on-date regressions. Alternative methods using staging duration to estimate passage population size and mass gains were shown to be unbiased. Using these methods, we estimated a passage population size in 2004 of 18,000 Red Knot that arrived at an average mass of 111 g and, on average, gained mass at 7.2 g day-1. Thus, in 2004, the passage population was substantially smaller than the recent peak count of 50,360 in 1998, which confirms a significant decline in the number of Red Knot staging in Delaware Bay. Use of refined techniques such as these is essential if management decisions such as those in Delaware Bay are to be based on firm scientific advice.

© 2009 by The American Ornithologists' Union. 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, http://www.ucpressjournals. com/reprintInfo.asp.
Simon Gillings, Philip W. Atkinson, Allan J. Baker, Karen A. Bennett, Nigel A. Clark, Kimberly B. Cole, Patricia M. González, Kevin S. Kalasz, Clive D. T. Minton, Lawrence J. Niles, Ron C. Porter, Inês De Lima Serrano, Humphrey P. Sitters, and Jean L. Woods "Staging Behavior in Red KNOT (Calidris Canutus) in Delaware BAY: Implications for Monitoring Mass and Population Size," The Auk 126(1), 54-63, (1 January 2009).
Received: 24 November 2006; Accepted: 1 June 2008; Published: 1 January 2009

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