Changes in Breeding Bird Populations in
North Dakota: 1967 to 1992-93
Acknowledgments
We are grateful to H. A. Kantrud, National Biological Service, for his advice and guidance throughout all phases of this study. J. R. Sauer of the National Biological Service and B. G. Peterjohn of the U.S. Fish and Wildlife Service supplied trends from the Breeding Bird Survey. This study would not have been possible without the cooperation of the many land owners, operators, and managers who allowed us to survey birds on their land. We thank C. J. Johnson and M. D. Schwartz for assistance in the field. R. L. Hutto, H. A. Kantrud, T. E. Martin, C. S. Robbins, P. F. Springer and three anonymous reviewers commented on earlier drafts of this manuscript. This study was inspired by the innovative thoughts and foresight of Robert E. Stewart (1913- 1993), whose scientific accomplishments were innumerable; we dedicate this paper to his memory.
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