REFERENCES 



Erwin, R.M. and C. Korschgen. 1979. Coastal waterbird colonies: Maine to 

 Virginia, 1977--an atlas showing colony locations and species composi- 

 tion. U.S. Fish & Wildlife Service. FWS/OBS-79/08. 647 pp. 



Kadlec, J., and W. Drury. 1968. Structure of the Nev/ England herring gull 

 population. Ecology 49:644-676. 



Odum, E. 1971. Fundamentals of ecology. W.B. Saunders Co., Philadelphia, 

 Pa. 574 pp. 



Osborn, R., and T. Custer. 1978. Herons and their allies: atlas of Atlantic 

 coast colonies: 1975 and 1976. U.S. Fish & Wildlife Service. FWS/OBS- 

 77/08. 211 pp. 



Parnell, J., and R. Soots, Jr. 1979. Atlas of colonial waterbirds of North 

 Carolina estuaries. Univ. of North Carolina Sea Grant Publ. UNC- 

 SG-78-10. 269 pp. 



Portnoy, J. 1977. Nesting colonies of seabirds and wading birds--coastal 

 Louisiana, Mississippi, and Alabama. U.S. Fish & Wildlife Service. 

 FWS/OBS-77/07. 126 pp. 



Sowls, A., S. Hatch, and C. Lensink. 1978. Catalog of Alaskan seabird colo- 

 nies. U.S. Fish & Wildlife Service. FWS/OBS-78/78. 153 pp. 



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