The Effect of Seasonal Cattle Grazing On California Bighorn Sheep Habitat Use

Author

Melanie J. Steinkamp, Utah State University

Date of Award:

5-1990

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Wildland Resources

Department name when degree awarded

Fisheries and Wildlife

Committee Chair(s)

John A. Bissonette

Committee

John A. Bissonette

Committee

Philip Urness

Committee

Thomas Edwards

Committee

David Balph

Abstract

The effect of seasonal cattle grazing on a newly reintroduced population of California bighorn sheep (Ovis canadensis californiana) in Big Cottonwood Canyon, Idaho, was studied. The hypothesis that bighorn sheep avoid cattle was tested. The issue of avoidance between bighorn sheep and livestock is arguable. Some studies have found that bighorn sheep avoid cattle while others have found no response of bighorn sheep to cattle.

Evidence was found to document the avoidance of cattle by bighorn sheep. The size of the bighorn's home range and core area decreased with the movement of cattle into areas of high bighorn use. As cattle were moved into bighorn core areas, sheep responded by relocating. Bighorn sheep decreased their distance to escape terrain as cattle moved closer. The level and location of human disturbance on the study area did not have any effect on bighorn sheep movements or how sheep used the habitat.

The severity of response observed is in marked contrast with the response of established bighorn populations to cattle. I suggest that newly reintroduced bighorn sheep are extremely sensitive to disturbance as a result of relocation trauma. Sensitivity may diminish over time.

Checksum

76c12815b670a916a2c166a638a8b1b5

Recommended Citation

Steinkamp, Melanie J., "The Effect of Seasonal Cattle Grazing On California Bighorn Sheep Habitat Use" (1990). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 6486.
https://digitalcommons.usu.edu/etd/6486