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Full-Text Articles in Life Sciences
Body Condition Of Endangered Humpback Chub In Relation To Temperature And Discharge In The Lower Colorado River, Forest P. Hayes, Michael J. Dodrill, Brandon S. Gerig, Colton Finch, William E. Pine Iii
Body Condition Of Endangered Humpback Chub In Relation To Temperature And Discharge In The Lower Colorado River, Forest P. Hayes, Michael J. Dodrill, Brandon S. Gerig, Colton Finch, William E. Pine Iii
Watershed Sciences Faculty Publications
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 …
Growth Of Endangered Humpback Chub In Relation To Temperature And Discharge In The Lower Colorado River, W. E. Pine Iii, K. Limburg, B. Gerig, Colton Finch, D. Chagaris, L. Coggins, D. Speas, D. A. Hendrickson
Growth Of Endangered Humpback Chub In Relation To Temperature And Discharge In The Lower Colorado River, W. E. Pine Iii, K. Limburg, B. Gerig, Colton Finch, D. Chagaris, L. Coggins, D. Speas, D. A. Hendrickson
Watershed Sciences Faculty Publications
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 …
Characterizing Growth And Condition Of Endangered Humpback Chub In The Lower Colorado River, William E. Pine Iii, Brandon S. Gerig, Colton Finch
Characterizing Growth And Condition Of Endangered Humpback Chub In The Lower Colorado River, William E. Pine Iii, Brandon S. Gerig, Colton Finch
Watershed Sciences Faculty Publications
This paper is a preface to the two papers that follow in this issue. The two papers (by Pine et al. and Hayes et al.) use long-term fish sampling data from ongoing Humpback Chub monitoring efforts and archival otolith samples (from museums) collected in the lower Colorado and Little Colorado Rivers during periods of both cold- and warm-water conditions to assess whether Humpback Chub growth characteristics may have responded to changes in water temperature. Growth patterns are often of interest to resource managers because growth integrates a large range of environmental and ecological factors, including habitat conditions. Together, these papers …
Comparison Of Burbot Populations Across Adjacent Native And Introduced Ranges, Annika W. Walters, Elizabeth G. Madenville, W. Carl Saunders, Paul C. Gerrity, Joseph A. Skorupski, Zack E. Underwood, Eric I. Gardunio
Comparison Of Burbot Populations Across Adjacent Native And Introduced Ranges, Annika W. Walters, Elizabeth G. Madenville, W. Carl Saunders, Paul C. Gerrity, Joseph A. Skorupski, Zack E. Underwood, Eric I. Gardunio
Watershed Sciences Faculty Publications
Introduced species are a threat to biodiversity. Burbot, Lota lota, a fish native to the Wind River Drainage, Wyoming and a species of conservation concern, have been introduced into the nearby Green River Drainage, Wyoming, where they are having negative effects on native fish species. We compared these native and introduced burbot populations to evaluate potential mechanisms that could be leading to introduction success. We examined genetic ancestry, physical habitat characteristics, community composition, and burbot abundance, relative weight, and size structure between the native and introduced range to elucidate potential differences. The origin of introduced burbot in Flaming Gorge …