Sul Ross State University

Habitat Selection, Movements, and Guzzler Use
by Desert Bighorn Sheep on the Black Gap Wildlife Management Area

by Justin Foster, Mike Pittman (Texas Parks and Wildlife Department)
and Louis A. Harveson

Controversy arises over the use of guzzlers by desert bighorn sheep (Ovis canadensis). Previous research shows standing water use by desert bighorn sheep to range from minimal to frequent.

There are insufficient data to justify the monetary expenses incurred for guzzler construction. The goal of this research is to investigate guzzler use by desert bighorn sheep. Our specific objectives are to:

1. Evaluate habitat use by desert bighorn sheep
2. Describe desert bighorn sheep movement patterns and home ranges
3. Document food habits
4. Make recommendations on the selection of future guzzler sites.

This research will test the research hypothesis that desert bighorn sheep use habitat in proportion to availability. Data will be collected during four seasons (Dec-Feb, Mar-May, Jun-Aug, Sep-Nov) for one year (n = 4 seasons).

Less than 17 desert bighorn sheep are presently outfitted with radio collars. Data from BGWMA biweekly aerial surveys will be augmented by ground telemetry obtained from this study. Telemetry locations will be plotted on 7.5 min USGS quad maps.

Locations will be segmented into three categories (Use, Loitering, No Use). Data will be analyzed with a Chi-square test to assess desert bighorn use of guzzlers.

Four or more radio-collared desert bighorn sheep will be assigned for each five-day work period. No less than 20 locations will be recorded in a five-day work period. Unscheduled radio locations will be documented as opportunities arise.

Approximately 1,040 locations will be recorded during this project.

This project is being funded by the Texas Parks and Wildlife Department, Houston Livestock Show and Rodeo and Sul Ross State University.