Colorado Parks and Wildlife has a long history of studying and
managing mule deer, dating back to the agency’s origins. In
recent decades, CPW has invested millions of dollars annually to
manage, monitor and study mule deer, with many of these efforts
focused in western Colorado. To capture this history and set the
stage for moving forward, CPW produced a three-page publication
titled Colorado's Mule Deer Story.
Together with the public and stakeholders, CPW will work to
stabilize, sustain and increase mule deer populations in Colorado and, in turn, increase hunting and wildlife-related recreational
CPW’s population objective for mule deer is approximately
560,000 statewide; the latest estimate puts the statewide population
at under 450,000. CPW is not suggesting that the removal of
predators is the solution to increasing statewide deer numbers to
560,000. These two research projects are designed to evaluate the
extent to which predation is limiting deer population size in the
two specific study areas. For more information, please listen to the presentation of Piceance Basin and Arkansas River Basin Predator Control Plans and review the following resource.
Your browser does not support the embedded audio. To listen, please download the file.
TOPIC: Presentation of Piceance Basin and Arkansas River Basin Predator Control Plans. Presented by Jeff Ver Steeg at the December 14, 2016 Commission Meeting in Fort Collins, Colorado.
Presentation of Piceance Basin and Arkansas River Basin Predator Control Plans
Why is CPW focused on deer populations in the Piceance Basin and Upper Arkansas River study areas?
Recent research and monitoring efforts suggest predation may play more of a role than previously thought in limiting mule deer populations. CPW proposes to test this idea in two areas of the state where habitat conditions do not appear to be limiting those populations. Maintaining healthy wildlife populations for future generations is one of the primary goals for CPW.
This represents a potential paradigm shift where previous research addressing primarily habitat limited systems showed that predation was largely compensatory (summarized by Ballard et al. 2001 and Forrester and Wittmer 2013).
Decline in frequency of severe winters recently, resulting in milder winter conditions overall, has resulted in higher winter survival rates, but deer populations have generally remained at lower levels than were evident prior to the 1990s.
New information suggests that some deer populations in Colorado are no longer nutritionally limited by poor habitat and therefore predation may be a more important mortality factor affecting population performance.
Predation was likely not the primary reason for declines that occurred since the 1980s, but may be at least partially related to the lack of recovery observed with lower frequency of periodic severe weather events.
CPW is addressing potential factors limiting mule deer populations outlined in our West Slope Mule Deer Strategy that was adopted by the CPW Commission in December 2014.
Landscape-scale habitat management to improve habitat
Predator management where predation may be limiting deer survival
Protect habitat and mitigate development impacts
Reduce the impacts if highways on mule deer survival, movements and migration
Reduce the impacts of human recreation on mule deer
Regulate doe harvest and provide youth opportunity
Why does CPW need this research now?
Colorado is evolving- the population is growing and the landscape is changing. CPW needs to plan ahead for emerging wildlife issues for future generations.
With these studies, CPW intends to make a meaningful contribution to the body of scientific wildlife knowledge.
What CPW is proposing in the Upper Arkansas River study is unique in size and scope. Piceance research is addressing predator control/management in a more focused and fine scale manner - as suggested by Ballard et al. 2001 and the Mule Deer Working Group - this idea has not been tested previously.
How is CPW conducting these studies?
The Piceance Basin Predator research study will monitor fawn survival in two areas over the next three years. One area will receive predator reduction, the other will not. CPW anticipates removing between five and ten mountain lions and ten to twenty-five black bears annually in the one area of the study.
In years one through three, mountain lion densities will be reduced, while mountain lions in the other area will experience minimal hunter harvest
In years four through six the suppressed population will be allowed to increase towards natural habitat potential, similar to the area receiving low hunter harvest.
Is CPW only pursuing these research studies to increase hunting licenses and/or revenue?
No. Revenues were not a factor in determining where and how to proceed and revenues have never been a driver in setting hunting license numbers. In fact, the CPW Commission reduced the total number of deer licenses in the Piceance Basin by 85% since 2007. The number of licenses adjusted by possible outcomes of these studies is minimal in light of CPW's overall budget challenges and no future management actions are being contemplated prior to the completion of the research.
Ongoing research in the Piceance Basin suggests predation rather than other factors (habitat, energy development) is most likely limiting this population.
In recent years, mule deer populations in Colorado have decreased in several areas on the West Slope. The agency hosted a series of public meetings in 2014, designed to gather input from sportsmen and women and others interested in conserving the species.
The outreach culminated in the development of the West Slope Mule Deer Strategy, a plan consisting of seven components specifically aimed at addressing the decreasing numbers.
$500,000 has been allocated initially to implement the strategy and CPW may spend approximately $5 million over the next ten years. These funds will be used for continuing efforts to stop the slide, including monitoring, extensive research and habitat improvement projects.
TOPIC: Mule Deer Strategy: Summary of Public Input: Julie Shapiro, Brooke Trainum: The Keystone Center. Update provided at the July 2014 Commission Meeting
The mission of Colorado Parks and Wildlife(CPW) is to perpetuate the wildlife resourses of the state, to provide a quality state parks system, and to provide enjoyable and sustainable outdoor recreation opportunities that educate and inspire current and future generations to serve as active stewards of Colorado's natural resources.
CPW is a nationally recognized leader in conservation, outdoor recreation and wildlife management. As a science-based wildlife management agency CPW has a duty to understand the predator/prey relationship to support the healthy balance of wildlife populations.
Colorado boasts one of the most diverse and abundant wildlife populations in North America due to the diligence and dedication of our researchers, field staff and especially funding from hunters and anglers.