8250

• UCREFRP Catalog Number: 8250
• Author: Lamarra, V. A.
• Title: Longitudinal Variation in the Trophic Structure of the Upper Colorado River.
• USFW Year: 1999.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

TABLE OF CONTENTS
LIST OF TABLES ..................................................... iii
LIST OF FIGURES ....................................................iv
ACKNOWLEDGMENTS .............................................. vii
EXECUTIVE SUMMARY .............................................. ix
INTRODUCTION ......................................................1
Background ......................................................1
Identification of Problem ............................................ 2
OBJECTIVE AND HYPOTHESIS ........................................ 3
METHODS ............................................................3
Research Approach ................................................3
Study Area .......................................................4
Sampling Schedule .................................................5
Primary and Secondary Trophic Levels ................................. 6
Physical Parameters .......................................... 6
Biological Parameters ........................................ 7
RESULTS .............................................................7
Temporal Variations (River-Wide) .................................... 9
Physical Parameters .......................................... 9
Water Quality .............................................. 12
Biological Parameters ....................................... 15
Temporal Variations (River-Wide by Habitat Type) ...................... 17
Physical Parameters ......................................... 17
Habitat Distribution ......................................... 21
Biological Parameters ....................................... 23
Spatial Variations (All Habitats) ..................................... 26
Physical Parameters ......................................... 26
Water Quality .............................................. 27
Habitat Distribution ......................................... 28
Biological Parameters ....................................... 28
Spatial Variations (by Habitat Type) .................................. 31
Physical Parameters ......................................... 31
Biological Parameters ....................................... 34
i