WSP01587

• File Number: 8220.101.17
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 7/1/1998
• Author: Valdez/et al.
• Title: The Aquatic Ecosystem of the Colorado River in Grand Canyon - Grand Canyon Data Integration Project - Synthesis Report
• Water Supply Pro - Doc Type: Report/Study

o.
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Table of Contents

TABLE OF CONTENTS (Continued)

The Fish Community _......... _ . _ . . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Factors Influencing Introductions ..........................................
Characterisf fN' F' b
ICSO atlve IS es .......................................
Characteristics of Non-Native Fishes .............. . . . . . . . . . . . . . . . . . . . . .

Types of Interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HabitatAlterations .................................................
Hybridization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parasites and Diseases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Predati
on .. .. . . .. .. . .. . .. .. .. .. .. . . . . .. .. . .. . . . . . . .. . .. . . . .. . . .. . .
Com ..
petition .. . .. .. .. .. .. .. .. . .. .. . .. . .. .. . . . .. . . . . .. . . .. . . . . .. . . . .
Summary ofNativcINon-native Fisb Interactions ..............................

CHAPTER 8 EFFECTS OF EXPERIMENTAL STEADY FLOWS. . . . . . . . . . . . . . . . . . . . . .

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Background. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Postu1atcdEffects ..................................................
Postulated Effects - Low, Steady SummerlFall Flows .. . . . . . . . . . . . . . . . . . . . . . . . .
Stable Shorelines and Backwaters .....................................

Warm Shorelines and Backwaters .....................................
Warm Main Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stable Main Cbannel Flow and less Turbidity. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Postulated Effects - Sustained High Spring Flows .. . .. . .. .. .. .. .. . .. .. .. . .. . ..
Inundated BacIcwatm and Shoreline Habitats ............................
High, Turbid Main-Cbannel Flow .. .. .. . .. . .. .. .. .. .. .. . .. . .. . .. .. .. .. .

Ponded Tributary Mouths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'. . . . . . . . . . . .
Rebuilt Backwater Habitats

CHAPTER 9 INFORMATION NEEDS, DATA GAPS AND RESEARCH HYPOlHESES . . .

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Background...................................................... .
Overview of Aquatic Resource Studies in Grand Canyon ...................

Infonnation Needs and Data Gaps ....,......................................
Infonnation Needs. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Gaps ........................................................
Research Hypotheses ....................................................
Statement and Evaluation of Primary Hypotheses .........................
Evaluation and Prioritization of SecondaJy Hypotheses ....................
Hypotheses Not Directly Related To Evaluating Steady Flows .... . . . . . . . . . . .

Chapter 10 CONCLUSIONS, STRATEGIES, AND RECOMMENDATIONS ............. 189

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '. . . . . . . ., 189
Conclusions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 189

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