Acknowledgments

I thank J. T. Trevor for his immense help, and also J. S. Boates, H. L. Dickson, P. O. Dunn, R. E. Gill, P. W. Hicklin, D. B. Lank, E. H. Miller, R. I. G. Morrison, G. Page, A. L. Spaans, and L. M. White for comments and/or unpublished data. Unpublished data were collected while I was at Queen’s University, Kingston, Ontario and University of North Dakota, Grand Forks. I thank everyone who helped in the field at La Pérouse Bay, particularly E. Smith, E. Mallory, L. Stephenson, and M. Stalker. I appreciate the logistical support of L. W. Oring, F. Cooke, Queen’s University Tundra Biological Station at La Pérouse Bay, and the Churchill Northern Studies Centre. Research was supported by the National Science Foundation, Canadian Department of Indian and Northern Affairs, University of North Dakota Graduate School, AOU Carnes Award, Chapman Research Award, Sigma Xi Grant-in-Aid of Research, and E. Alexander Bergstrom Research Award.