Add to ORKGI'd ilk, to express my gratitude and appreciation to the following persons: Dr. Jamis F. Lah.y, mmajor professor, for his guidance and, most of all, his patience extended to me throughout my graduate program; Mr. Charles Phillips, biologist (U.S.F.S.), and Mr. Harold Sturgis, biologist (O.D.F.W.), for their help and support in pursuit of a field study; Dr. Tony Lewis, research associate (E.R.S.A.L.), and Mr. Dennis Issacson, research assistant (LR.S.A.L.), for their tøcbièal advice and initial support; and Ms. Brenda Aibritton, for her patience and good nature expressed while assisting in the structure and final typing of this research paper