scholarly journals Effects of Disparate Water Temperatures and Food Bases on Humpback Chub Growth Rates within the Little Colorado River, Arizona

2020 ◽  
Vol 40 (2) ◽  
pp. 475-487
Author(s):  
Dennis M. Stone ◽  
Michael J. Pillow ◽  
Kirk L. Young ◽  
David R. Van Haverbeke ◽  
James D. Walters
Keyword(s):  
Growth Rates ◽  
Colorado River ◽  
Humpback Chub

scholarly journals Growth of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

2017 ◽  
Vol 8 (1) ◽  
pp. 322-332 ◽  
Author(s):  
W.E. Pine III ◽  
K. Limburg ◽  
B. Gerig ◽  
C. Finch ◽  
D. Chagaris ◽  
...  
Keyword(s):  
Growth Rates ◽  
Environmental Conditions ◽  
Colorado River ◽  
Linear Models ◽  
Juvenile Fish ◽  
Grand Canyon ◽  
Analysis Of Covariance ◽  
Growth Variability ◽  
Management Actions ◽  
Humpback Chub

Abstract Assessments of growth can provide information needed to understand how fish populations respond to changing environmental conditions and management actions, including ecosystem experimentation. We estimated growth rates and parameter uncertainty from otoliths of endangered Humpback Chub Gila cypha from the Colorado River in Grand Canyon, Arizona. We then compared growth of Humpback Chub < age 2 that were 1) occupying the mainstem Colorado River during a period of variable discharge and cooler water temperatures (1980–1998; epoch 1), 2) occupying the Colorado River during a period of moderate discharge variability and warmer water (2001–2011; epoch 2), and 3) occupying the unregulated Little Colorado River. Because growth rates of juvenile Humpback Chub (< age 2) may be more sensitive to changes in environmental conditions than adult fish, we used analysis of covariance and linear models to compare growth of juvenile fish (slopes) between epochs and capture sites (mainstem Colorado River vs. Little Colorado River). Our analysis of covariance results were ambiguous (age × epoch × site interaction; P = 0.06). However, individual linear regressions of size and age by epoch and site suggest biologically important differences in growth, as evidenced by slower growth in the Colorado River in epoch 1 than in epoch 2, and slower growth in the Colorado River compared with the Little Colorado River for all time periods. Overall our results 1) provide information on growth and growth variability useful for parameterizing models to assess population viability and 2) provide empirical information on how growth of juvenile and adult Humpback Chub growth may respond to changing environmental conditions.

Distribution and Movement of Humpback Chub in the Colorado River, Grand Canyon, Based on Recaptures

2006 ◽  
Vol 135 (2) ◽  
pp. 539-544 ◽  
Author(s):  
Craig P. Paukert ◽  
Lewis G. Coggins ◽  
Christopher E. Flaccus
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Humpback Chub

scholarly journals Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

2017 ◽  
Vol 8 (1) ◽  
pp. 333-342 ◽  
Author(s):  
Forest P. Hayes ◽  
Michael J. Dodrill ◽  
Brandon S. Gerig ◽  
Colton Finch ◽  
William E. Pine III
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Management Program ◽  
Parameter Estimates ◽  
Water Release ◽  
Fish Removal ◽  
Glen Canyon Dam ◽  
Management Actions ◽  
Humpback Chub ◽  
Glen Canyon

Abstract Determining the population status of endangered Humpback Chub Gila cypha is a major component of the adaptive management program designed to inform operation of Glen Canyon Dam upstream from Grand Canyon, Arizona. In recent decades, resource managers have identified a portfolio of management actions (with intermittent implementation) to promote population recovery of Humpback Chub, including nonnative fish removal, changes in water release volumes and discharge ramping schedules, and reductions in hydropower peaking operations. The Humpback Chub population in Grand Canyon has increased over this same period, causal factors for which are unclear. We took advantage of unusual hydrology in the Colorado River basin in 2011 to assess trends in juvenile Humpback Chub length–weight relationships and condition in the Colorado River below Glen Canyon Dam as well as in the unregulated Little Colorado River. Within each river, we observed higher length–weight b-parameter estimates (exponent of the standard power equation) at higher water temperatures. We also found higher slope estimates for the length–weight relationship at higher temperatures in the Little Colorado River. Slope estimates were more variable in the Colorado River, where mean water temperatures were more uniform. The next step is to examine whether Humpback Chub length–weight relationships influence population metrics such as abundance or survival. If these relationships exist, then monitoring condition in juvenile Humpback Chub would provide a quick and low-cost technique for assessing population response to planned management experiments or changing environmental conditions.

scholarly journals Translocation of Humpback Chub into Tributary Streams of the Colorado River: Implications for Conservation of Large-River Fishes

2015 ◽  
Vol 144 (3) ◽  
pp. 502-514 ◽  
Author(s):  
Jonathan J. Spurgeon ◽  
Craig P. Paukert ◽  
Brian D. Healy ◽  
Melissa Trammell ◽  
Dave Speas ◽  
...  
Keyword(s):  
Colorado River ◽  
Large River ◽  
Humpback Chub

Seasonal and spatial patterns of growth of rainbow trout in the Colorado River in Grand Canyon, Arizona

2016 ◽  
Vol 73 (1) ◽  
pp. 125-139 ◽  
Author(s):  
Michael D. Yard ◽  
Josh Korman ◽  
Carl J. Walters ◽  
Theodore A. Kennedy
Keyword(s):  
Seasonal Variation ◽  
Rainbow Trout ◽  
Growth Rates ◽  
Large Scale ◽  
Colorado River ◽  
Grand Canyon ◽  
Foraging Efficiency ◽  
Invertebrate Drift ◽  
Regulated Rivers ◽  
Glen Canyon

Rainbow trout (Oncorhynchus mykiss) have been purposely introduced in many regulated rivers, with inadvertent consequences on native fishes. We describe how trout growth rates and condition could be influencing trout population dynamics in a 130 km section of the Colorado River below Glen Canyon Dam based on a large-scale mark–recapture program where ∼8000 rainbow trout were recaptured over a 3-year period (2012–2014). There were strong temporal and spatial variations in growth in both length and weight as predicted from von Bertalanffy and bioenergetic models, respectively. There was more evidence for seasonal variation in the growth coefficient and annual variation in the asymptotic length. Bioenergetic models showed more variability for growth in weight across seasons and years than across reaches. These patterns were consistent with strong seasonal variation in invertebrate drift and effects of turbidity on foraging efficiency. Highest growth rates and relative condition occurred in downstream reaches with lower trout densities. Results indicate that reduction in rainbow trout abundance in Glen Canyon will likely increase trout size in the tailwater fishery and may reduce downstream dispersal into Grand Canyon.

scholarly journals Evidence of Young Humpback Chub Overwintering in the Mainstem Colorado River, Marble Canyon, Arizona, USA~!2009-10-07~!2010-01-25~!2010-04-30~!

2010 ◽  
Vol 3 (1) ◽  
pp. 42-50 ◽  
Author(s):  
Matthew E. Andersen ◽  
Michael W. Ackerman ◽  
Kara D. Hilwig ◽  
A. Elizabeth Fuller ◽  
Paul D. Alley
Keyword(s):  
Colorado River ◽  
Humpback Chub
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