ACKNOWLEDGEMENTS 



Many colleagues at The Conservation Foundation assisted ably in 

 the preparation of this report. John Noble contributed extensively 

 to development of concepts and to the presentation itself, as did 

 John Clark, project leader. J. Clarence Davies, Executive Vice President, 

 provided institutional review. Craig Richardson assisted with research 

 and manuscript preparation. Mrs. Laura O'Sullivan was supervisor of 

 manuscript production and Ms. Claudia Wilson was graphics and design 

 director. 



In addition, David Williams provided advice on the concepts and 

 format for presentation. John Ludwigson edited the final version of 

 the manuscript. 



The author is grateful for the guidance provided by the Office 

 of Biological Services of the U.S. Fish and Wildlife Service, particularly 

 by Drs. Allan Hirsch, William Palmisano and Howard Tait. Larry Shanks 

 of that office was especially helpful in substantive aspects of the 

 work, in painstaking editorial assistance, and in coordination of the 

 manuscript review process. 



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