Stream flow in the Colorado River and Dolores River corridors has been significantly modified by water management, and continued flow alteration is anticipated in future decades with projected increases in human water demand. Bottomland vegetation has been altered as well, with invasion of non-native species, increases in wildfire and human disturbance, and currently, rapid shifts in riparian communities due to biological and mechanical tamarisk control efforts. In light of these conditions, land managers are in need of scientific information to support management of vegetation communities for values such as healthy populations of sensitive fish and wildlife species and human recreation. We propose to address these applied science needs by:
- investigating patterns in riparian and aquatic habitat complexity at tributary junctions on the regulated Colorado and Dolores rivers, and;
- building a comprehensive, spatially explicit, decision support tool to help resource managers on the Colorado River prioritize restoration of native vegetation.
This work will identify habitats and groups of species that may be more vulnerable to continued changes in flow, show spatially distributed relative costs of vegetation treatments, and identify many of the common risks to treatment success. Additionally, this work will provide important habitat baselines for informing future environmental flow planning given existing conditions.