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CONTENTS <br />Foreword ................................................................................................................................................................................ <br />Abstract .................................................................................................................................................................................. <br />Introduction ........................................................................................................................................................................... <br />Purpose and Scope ....................................................................................................................................................... <br />.................................................................................. <br />Description of Study Unit .......................................................... <br />Acknowledgments ....................................................................................................................................................... <br />Inventory of Biological and Contaminant Investigations of Streams .................................................................................... <br />Algal Communities ...................................................................................................................................................... <br />Macroinvertebrate Communities ....................................................................................................................:............ <br />Fish Communities ........................................................................................................................................................ <br />Habitat Characterization .............................................................................................................................................. <br />Contaminants in Organism Tissue ............................................................................................................................... <br />Contaminants in Bed Sediment ................................................................................................................................... <br />Effects of Environmental Setting on Biological Communities in Streams ........................................................................... <br />Natural Factors ............................................................................................................................................................ <br />Human Factors ............................................................................................................................................................. <br />Summary ................................................................................................................................................................................ <br />References Cited .................................................................................................................................................................... <br />FIGURES <br />1 7. Maps showing: <br />1. Location of the Upper Colorado River Basin study unit, physiographic provinces, and major streams........... <br />2. General locations of sites sampled for algal-community investigations ............................................................ <br />3. General locations of sites sampled for macroinvertebrate-community investigations ...................................... <br />4. General locations of sites sampled for fish-community investigations .............................................................. <br />5. General locations of sites sampled for habitat-characterization investigations ................................................. <br />6. General locations of sites sampled for contaminants in organism-tissue investigations ................................... <br />7. General locations of sites sampled for contaminants in bed-sediment investigations ....................................... <br />TABLES <br />III <br />1 <br />1 <br />2 <br />2 <br />4 <br />4 <br />20 <br />20 <br />20 <br />24 <br />24 <br />24 <br />28 <br />28 <br />29 <br />30 <br />31 <br />3 <br />21 <br />22 <br />23 <br />25 <br />26 <br />27 <br />1. Literature citations indexed by type of biological or contaminant investigation, physiographic province, <br />and predominant land use in the Upper Colorado River Basin study unit ....................................................................... 5 <br />2. Major aquatic biological taxa in the Southern Rocky Mountains and Colorado Plateau physiographic provinces of the <br />Upper Colorado River Basin study unit ........................................................................................................................... 28 <br />co~~rs v <br />