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ii <br />TA6L~ OF CONTENTS <br />Page <br />LIST OF ILLUSTRATIONS ................................................. iv <br />LIST OF TABLES ........................................................ v <br />INTRODUCTION .................... ..,................................. 1 <br />HISTORY ............................................, ................. 3 <br />CLIMATE .:............................................................. 1] <br />TOPOGRAPHY ............................................................ 16 <br />ACTION OF THE VIRGIN RIVER ............................................ 19 <br />VEGETATION ............................................................ 24 <br />WATER QUALITY .......................................................... 29 <br />WATER DISCHARGE ...........:............................................ 35 <br />METHODS ...................:............................. ............ 39 <br />LOCATION OF SAMPLING STATIONS ......................................... 41 <br />SPECIES ACCOUNTS ........... ......... ............................... 47 <br />SaZmo eZarki ssp ................................................. 47 <br />Salmo gairdneri .................................................. 53 <br />SaZveZinus fontinaZis •••• ....................................... 56 <br />Cyprinus carpio .................................... ............ 57 <br />Rhinichthys oseuZus .............................................. 59 <br />Notemigonus erz~soZeucas.• ........................................ 72 <br />Gila robusta seminuda••.• ........................................ 74 <br />Riehardsonius baZteatus hydrop:ZZox ............................... 84 <br />Notropis Zutrensis .......................,............ ......... 86 <br />_ Lepidaneda moZZispinis moZZispinis ............................... 92 <br />Pldgopterus argentissimus.......... ................... ....... 703 <br />Catostomus Zatipinn~is .............. ............................. i14 <br /> <br />