The purpose of this project is to determine if a newly formed rapid on the Colorado River is acting as a barrier to invasive non-native fish moving upstream from Lake Mead into the Grand Canyon National Park (GCNP). These non-native fish would threaten native desert fishes upstream to include the endangered Razorback Sucker and the Humpback Chub. The project will fill knowledge gaps on fish movement, species composition, and population dynamics in this minimally studied section of the Colorado River, and inform managers on whether active management actions (e.g. native fish translocations; non-native removals) may be required to conserve native fishes in the western Grand Canyon.
FWS, Arizona Game and Fish Department, and New Mexico Department of Game and Fish are working collaboratively to advance understanding of two at-risk gartersnake species. An immediate need is to determine where the species are occurring while advancing survey techniques in support of Species Status Assessments and future population viability analysis.There is a dearth of recent survey information throughout the range of the Narrow-headed Gartersnake (Thamnophis rufipunctatus/THRU) and Northern Mexican Gartersnake (T. eques) in Arizona. The project seeks to fill in these gaps by conducting rapid and intensive surveys in a number of sites where the species has not been detected in many years, where observations are...