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0 CONTENTS <br />Page <br />TABLES .................................................ix <br />FIGURES ............................................... xii <br />ACKNOWLEDGMENTS ................................... xviii <br />CHAPTER ONE: INTRODUCTION .............................. 1 <br />PHYSICAL DESCRIPTION .................................. 1 <br />Subdivisions ............................. ........ 3 <br />Geology........... .............................. 5 <br />Climate ........................................... 5 <br />STUDIES DONE IN THE UPPER BASIN ....................... 6 <br />EXISTING AND PROPOSED WATER PROJECTS .................... 9 <br />POTENTIAL IMPACTS OF WATER DEVELOPMENT .............. 11 <br />RECOVERY IMPLEMENTATION PROGRAM ................... 13 <br />CHAPTER TWO: LEGAL AND INSTITUTIONAL CONSTRAINTS ........ 16 <br />• CHAPTER THREE: HYDROLOGY ............................. 22 <br />SPECIES RESPONSE TO FLOW ........................... 22 <br />Spawning ........... 22 <br />Migration and spawning cues ....................... 22 <br />Hybridization ................................... 25 <br />Competition .................................... 26 <br />Reproductive success .......................... 28 <br />Seasonalflow needs ............................. 31 <br />Site specific flow recommendations ................... 39 <br />Larval Survival ..................................... 39 <br />Colorado squawfish .............................. 39 <br />Humpback chub 42 <br />Razorback sucker .......... ... ............ ... 43 <br />Bonytail chub .................................. 44 <br />Growth .......................................... 44 <br />Food Availability .................................... 44 <br />Biotic Interactions .............. .................... 45 <br />Colorado squawfish .............................. 45 <br />All four rare fishes ............................... 46 <br />Habitat Availiability .................... ......... 47 <br />All four rare fishes ........................ 47 <br />Colorado squawfish .............................. 48 <br />• Humpback chub ................................ 50