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i Y <br />ACKNOWLEDGMENTS 3 <br />We especially wish to express our appreciation to the personnel of <br />Dinosaur National Monument, particularly Steve Petersburg and Earl Perry, <br />without whose full cooperation and assistance this project would not have <br />been possible. They made countless arrangements and provided the excellent <br />logistic support so essential to the success of this type of field research. <br />We-thank the boatmen, Day de la Hunt, Jirn McBrayer, Bob Ratcliff, Barbara <br />Warner, and Gary Young, not only for their providing of safe but exciting <br />journeys, but for their interest and field assistance in the project. we <br />also appreciate the unpaid field assistance provided by Buck Cully and <br />Wolky Toll on several trips. Excellent support was provided in plant <br />identifications and in manuscipt typing by Beth Crowder. <br />