Whittaker, R.H. 1975. Communities and ecosystems. McMillan Pub. Co. 385 pp. 



Wiens, J. A. 1973. Pattern and process in grassland bird communities. Ecol . 

 Monogr. 43:237-270. 



Wiens, J. A. 1974. Habitat heterogeneity and avian community structure in 

 North American grasslands. Am. Midi. Nat. 91:195-213. 



Wiens, J. A. and M.I. Dyer. 1975. Rangeland avifaunas: their composition, 



energetics, and role in the ecosystem. Pages 146-181 in D.R. Smith (ed.) 

 Proceedings of the Symposium on Management nf Forest and Range Habitats 

 for Nongame Birds. U.S.D.A. Forest Service, General Technical Report WO-1. 



Willson, M.F. 1974. Avian community organization and habitat structure. 

 Ecology 55:1017-1029. 



Yde, C.A. 1977. Distribution and movements of sharp-tailed grouse during spring 

 and summer in relation to rest-rotation grazing. M.S. Thesis, Montana State 

 University, Bozeman. 70 pp. 



Zarn, M. 1974. Burrowing owl ( Speotyto cunicularia hyprigaea ). U.S. D.I. Tech. 

 Note T-N-250. Habitat management series for unique or endangered species. 

 Report No. 11. 25 pp. 



213 



