9588

• UCREFRP Catalog Number: 9588
• Author: Bestgen, K. R. and e. al.
• Title: Population Status of Colorado Pikeminnow in the Green River Basin, Utah and Colorado.
• USFW Year: 2005.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

TABLE OF CONTENTS
EXECUTIVE SUMMARY ..........................................................3
LIST OF TABLES ...............................................................6
LIST OF FIGURES ...............................................................7
INTRODUCTION ................................................................9
Status and natural history of Colorado pikeminnow ............................ 12
STUDY AREA ................................................................14
METHODS ...................................................................17
Sampling and fish handling ............................................... 17
Robust design for capture-recapture studies . ................................. 20
Statistical modeling ...................................................... 20
Survival and finite population rate of change models ........................... 23
RESULTS ....................................................................25
River reach abundance estimates ........................................... 25
Basin-wide abundance estimates . .......................................... 30
Survival estimates ....................................................... 31
Probabilities of capture . ................................................. 32
Probabilities of transition ................................................. 34
Finite population rates of change .......................................... 35
ISMP catch/effort trends, 1991 to 2003 ...................................... 36
DISCUSSION .................................................................38
Model selection and assumptions ........................................... 39
Abundance estimates ....................................................43
Survival rates . .........................................................46
Recruitment rates . ......................................................52
Probabilities of capture . ................................................. 56
Transition rates ......................................................... 57
CONCLUSIONS ................................................................58
RECOMMENDATIONS ..........................................................60
ACKNOWLEDGMENTS ..........................................................61
LITERATURE CITED ............................................................63
APPENDICES ................................................................105
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