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Acknowledgments

Establishment and maintenance of the plots was done by L. M. Kirsch (deceased), H. W. Miller, K. F. Higgins, J. M. Callow,and H. L. Clark, to whom I am most grateful. R. E. Stewart (deceased) and R. L. Kologiski (deceased) surveyed the vegetation in the plots. Other bird observers were P. F. Springer (1972), G. L. Krapu (1973),J. M. Callow 1979-80), C. A. Faanes (1981-83, 1987), J. M. Andrew (1981), J. L. Eldridge (1984), J. Hassler (1985), K. A. Luttschwager (1985), T. M. Pabian (1985), J. M. Hicks (1986), and M. D. Schwartz (1987-89, 1991-95).

References

1.  Johnson, D. H. (1996) Effects of fire on bird populations in mixed-grass prairie,
         in Ecology of Great Plains vertebrates and their habitats. (Knopf, F. L. 
         and Samson, F. B., eds). In press.

2.  Hall, G. A. (1964) Breeding-bird censuses: why and how.  Audubon Field Notes 18,413-416.

3.  Van Velzen, W. T. (1972) Breeding bird census instructions.  Am. Birds 26,1007-1010.

4.  Wiens, J. A. (1969) An approach to the study of ecological relationships among 
         grassland birds.  Ornithol. Monogr. 8.

Appendix 1. Citations of published censuses of birds on Woodworth Study Area.

                                                                                               
Johnson, D. H. and Springer, P. F. (1972) Breeding bird populations of selected grasslands
     in east-central North Dakota.  Am. Birds 26,970-975.

Johnson, D. H. and Krapu, G. L. (1973) Thirty-seventh breeding bird census - mixed prairie.
     Am. Birds 27,989-990. 

Johnson, D. H. (1974) Breeding bird populations of selected grasslands in each central 
     North Dakota--1974.  Am. Birds 28,1030-1031.

Johnson, D. H. (1975) Breeding bird populations of selected grasslands in each central 
     North Dakota--1975.  Am. Birds 29,1119-1120.

Johnson, D. H. (1977) Breeding bird populations of selected grasslands in each central 
     North Dakota--1976.  Am. Birds 31,62-63.

Johnson, D. H. (1978) Breeding bird populations of selected grasslands in each central 
     North Dakota--1977.  Am. Birds 32,81-82.

Johnson, D. H. (1979) Forty-second breeding bird census - mixed prairie.  Am. Birds 33,80.

Johnson, D. H. and Callow, J. M. (1980) Forty-third breeding bird census.  On selected 
     prairies in each-central North Dakota--1979.  Am. Birds 34,67-69.

Johnson, D. H. and Callow, J. M. (1981) Forty-fourth breeding bird census.  On selected 
     prairies in east-central North Dakota - 1980.  Am. Birds 35,78-79.

Johnson, D. H., Faanes, C. A. and Andrew, J. M. (1982) Forty-fifth breeding bird census 
     Mixed prairie.  Am. Birds 36,79-80.

Johnson, D. H. and Faanes, C. A. (1983) Thirty-fifth breeding bird census 
     mixed prairie.  Am. Birds 37,80, 82-83.

Faanes, C. A. and Johnson, D. H. (1984) Forty-seventh breeding bird census 
     Kentucky blue grass prairie and mixed prairie I-VIII.  Am. Birds 38,96-97.

Johnson, D. H. (1989) Bird Censuses - Kentucky bluegrass prairie and mixed prairies I-V.  
     J. Field Ornithol. 60(supplement),58-60.

Johnson, D. H. and Schwartz, M. D. (1990) Bird Censuses 77-82: Kentucky bluegrass prairie 
     and mixed prairies I-V.  J. Field Ornithol. 61(supplement),73-75.

Johnson, D. H. and Schwartz, M. D. (1991) Bird Censuses 86-91: Kentucky bluegrass prairie 
     and mixed prairies I-V.  J. Field Ornithol. 62(supplement),82-84.

Johnson, D. H. and Schwartz, M. D. (1992) Bird Censuses 115-120: Kentucky bluegrass prairie 
     and mixed prairies I-V.  J. Field Ornithol. 63(supplement),105-106.

Johnson, D. H. and Schwartz, M. D. (1993) Bird Censuses 116-121: Kentucky bluegrass prairie 
     and mixed prairies I-V.  J. Field Ornithol. 64(supplement),105-107.

Johnson, D. H. and Schwartz, M. D. (1994) Bird Censuses 126-131: Kentucky bluegrass prairie 
     and mixed prairies I-V.  J. Field Ornithol. 65(supplement),120-122.

Johnson, D. H. and Schwartz, M. D. (1995) Bird Censuses 123-128: Kentucky bluegrass prairie 
      and mixed prairies I-V.  J. Field Ornithol. 66(supplement),109-11.

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