Acknowledgments

Jehl’s field work at Churchill over many years received support from the Frank M. Chapman Fund, the National Geographic Society, The University of Michigan, the Joan Irvine Smith and Athalee Clark Foundation, the Canadian Wildlife Service, Hubbs-Sea World Research Institute, and James and Tootie Morris. Klima was supported by grants from the Northern Research Fund and Hubbs-Sea World Research Institute. Harris’s field work at Schefferville was supported by Museum of Natural Sciences (National Museums of Canada), The Northern Research Group (University of Ottawa), The Frank M. Chapman Memorial Fund, Sigma-Xi, and the University Research Support Fund of the Canadian Wildlife Service. Many researchers assisted in various phases of the field work, including D. J. T. Hussell, W. Lin, C. Macdonald, and S. Cullen. For help in preparation of the manuscript and providing information, we thank R. C. Clement, H. Ouellet, B. McCaffery, G. Page, P. Tomkovich, and Western Foundation of Vertebrate Zoology (via C. Sumida and R. Corado), M. McNall, W. Campbell, C. S. Houston, M. Gosselin, R. Koes, J. DuBois, and R. MacIntosh. D. Long and K. Berge provided access to the collections and library of the California Academy of Sciences. Information on breeding distribution in Yukon was provided by P. Sinclair, Canadian Wildlife Service. The sonograms were provided by Cornell Laboratory of Ornithology and S. Gaunt and the Borror Laboratory of Bioacoustics, The Ohio State University. B. Harrington and L. Payne sent us important unpublished information on dowitcher status, including access to data from the International Shorebird Surveys. Jehl’s field studies in the 1960s were stimulated by F. Pitelka’s seminal paper on dowitcher taxonomy and abetted greatly by the mentoring of D. M. Parmelee. Harris is indebted to H. Ouellet and J. Vaillancourt, for their support and guidance.