7266

• UCREFRP Catalog Number: 7266
• Author: Pearson, W. D.
• Title: Distribution of Macroinvertebrates in the Green River below Flaming Gorge Dam, 1965-1973.
• USFW Year: 1967.
• USFW - Doc Type: Utah State University,
• Copyright Material: NO

•
ok TABLE OF CONTENTS
INTRODUCTION . . .. .1
STUDY AREA . . . . . . . .. . . .5
Vegetation and Climate . . . 5
Sampling Stations . . 6
MATERIALS AND METHODS . . . . . . 10
PHYSICAL AND CHEMICAL ENVIRONMENT . . . . . . . . . . . 12
Gradient . . . . . . . . . . . . . . . . . 12
Discharge . . . . . . . . .. . . . . . . . . 12
Temperature . . . . . . . . 15
f
Turbidity . . . . . . . . . .
. . 16
Dissolved Oxygen . . . . . . . . . . 19
Dissolved Solids . . . . . . . . . . . . . 23
Hydrogen-ion Concentration . . . . . . . . . 25
DISTRIBUTION AND ABUNDANCE OF BENTHIC INVERTEBRATES . . . . 26
Little Hole . . . . . . . . . . . . . . . 27
Carr Ranch . . . . . . . . . . . . . . . . 31
Echo Park . . . . .. . 33
Island Park . . . . . . . . . . . . 36
Supplementary Stations . .40
SPECIES COMPOSITION OF BENTHIC INVERTEBRATES BEFORE AND
i AFTER CONSTRUCTION OF FLAMING GORGE DAM 45
DRIFT RATES OF BENTHIC INVERTEBRATES . 52
Drift Sampling . . . . . . . . . . 53