8033

• UCREFRP Catalog Number: 8033
• Author: Lentsch, L. D., et al.
• Title: Endangered Fish Interim Management Objectives for the Upper Colorado River Basin Recovery And Implementation Program -Final Report.
• USFW Year: 1998.
• USFW - Doc Type: 55,
• Copyright Material: NO

Table 1. Summary of information used to prepare recovery plans reviewed by Tear et al. (1995)
and that available for recovery of endangered Colorado River fish.

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1
11

C
Information Recovery
Plans' Colorado
River Fish2
Species Distribution:
Species distribution or range was known 87.92% C,R,H
Range expansion or contraction addressed 69.30% C,R,B
Distribution variability due to habitat differrennces addressed 45.59% C,R,H
Area of current distribution or range (percentage ofhistorical) 15.92% C,R H
Horne-range data available 7.23% C
Dispersal data available 5.54% C
Species abundance:
Current total population estimated 46.31% C,R
Effective population size evaluated 5.54%
Temporal variation in abundance addressed 22.08% C
Population demographics.
Estimates for:
Fecundity 23.54% C
Age structure 12.46% C,R
Survival 5.92%
Survival by age class 2.77%
Fecundity by age class 2.23%
Temporal variation estimated for:
Fecundity 1.00%
Age structure 0.50%
Survival 0.50%
Population dynamics:
Lack of information addressed 78.22% C,R,H,B
Population regulation addressed 18.23% C
Density dependence addressed 11.000/0
Estimates of actual growth rate 0.61%
I Modified from Tear et a1. 1995
2 C=Colorado squawfish, R= razorback sucker, H=humpback chub, B=bonytml
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2
r