Laserfiche WebLink
SA 1 What are the most limiting factors to successful humpback chub adult recruitment in the <br />mainstem: spawning success, predation on young of year and juveniles, habitat (water, temperature), <br />pathogens, adult maturation, food availability, competition? <br />SA 2 What are the most probably positive and negative impacts of warming the Colorado River on <br />humpback chub adults and juveniles ?] <br />Linkages between (productivity) food web changes and fish population changes: <br />SSQ 3 -5 How is invertebrate flux affected by water quality (for example, temperature, nutrient <br />concentrations, turbidity) and dam operations? <br />SA 1 What are the most limiting factors to successful HBC adult recruitment in the mainstem: <br />spawning success, predation on YoY and juveniles, habitat (water, temperature), pathogens, adult <br />maturation, food availability, competition? <br />Responses of native fish to mechanical removal of nonnative fish, fall steady flows, and backwaters <br />created by experimental high flows: <br />SSQ 1 -2 Does a decrease in the abundance of rainbow trout and other cold- and warmwater <br />nonnatives in Marble and eastern Grand Canyons result in an improvement in the recruitment rate of <br />juvenile HBC to the adult population? <br />SSQ 5 -1 How do dam release temperatures, flows (average and fluctuating component), <br />meteorology, canyon orientation and geometry, and reach morphology interact to determine <br />mainstem and nearshore water temperatures throughout the CRE? <br />Using the new shifting rating curve method for routing suspended sand through the CRE, the project <br />will produced advanced simulations for flow operations at Glen Canyon Dam and fate of tributary <br />supplied sand inputs: <br />SSQ 4 -1 Is there a "Flow Only" operation (that is, a strategy for dam releases, including managing <br />tributary inputs with BHBFs, without sediment augmentation) that will rebuild and maintain sandbar <br />habitats over decadal timescales? <br />Note: Results from element 5, will integrate suspended- sediment simulations with aquatic /fish <br />simulations within the Ecopath with Ecosim (EwE) modeling being developed by Walters and others. <br />Links /Relationships to Other Projects <br />This project will uses data from all studies that collect information on the aquatic biota of Glen, Marble, <br />and Grand Canyons, including the aquatic food web, HBC monitoring, Lees Ferry trout monitoring, <br />mechanical removal, nonnative fish monitoring, and the nearshore ecology project. The main benefits to <br />the projects listed will be to provide novel analyses of data and methods for linking project results into <br />overall conceptual and quantitative models for response of the Colorado River aquatic ecosystem to <br />management changes. The flow and sediment modeling elements of this project are linked most closely <br />to the Integrated Flow, Sediment, and Temperature Modeling project. <br />34 <br />