Abstract
Ungulate species have consistently been a major focus of reintroductions to their native ranges. Bighorn sheep (Ovis canadensis) are an ecologically sensitive species, and have experienced population declines throughout their historic range; bighorn sheep inhabited the Black Hills region of South Dakota but were extirpated from the area due to anthropogenic impacts in the early 1900s. To continue to restore populations to the area, we translocated 26 bighorn sheep from Alberta, Canada to the Deadwood Region of the Black Hills. Bighorn sheep were fitted with VHF or GPS collars and monitored throughout the duration of the study (Feb 2015–Jan 2017). Our objectives were to evaluate movement patterns post-release of bighorn sheep in the translocated Deadwood bighorn sheep herd. We utilized 3 types of home-range analyses based on collar data; kernel density estimation (KDE), minimum convex polygon (MCP), and Brownian Bridge Movement Models (BBMM) were used to estimate home-ranges year 1, year 2, and for the duration of the study. Home-range size utilizing KDE (95%; \(\overline{x}\) = 41.41 km2, SE = 10.50), minimum convex polygon (95%; \(\overline{x}\) = 55.73 km2, SE = 15.04), and BBMM (95%; \(\overline{x}\) = 32.95 km2, SE = 4.67) differed among methods. Year 1 home-range sizes (95% BBMM; \(\overline{x}\) = 40.01 km2) were larger than year 2 (95% BBMM; \(\overline{x}\) = 4.08 km2) home-range sizes. Travel distances were also larger in year 1 (\(\overline{x}\) = 431.80 km) than year 2 (\(\overline{x}\) = 368.77 km). Our results indicate that after an acclimation period, which included individual dispersal, the translocated Deadwood bighorn sheep herd settled into smaller home-ranges near the release site.
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The data used and/or analyzed during the study are available from the corresponding author with a reasonable request.
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Acknowledgements
We thank the South Dakota Department of Game, Fish and Parks, Civil Air Patrol, Deadwood Police Department, Lawrence County Sheriff’s Office, and private property owners in the Deadwood area for their assistance and property access. We thank J. Smith and B. Simpson for their assistance with data analyses. We thank T. Haffley, K. Cudmore, J. Doyle, J. Clark, and C. Werdel for their assistance with monitoring, capturing, and euthanizing bighorn sheep during the study period.
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Financial support for this project was provided by Federal Aid to Wildlife Restoration administered through the South Dakota Department of Game, Fish and Parks (Study Number 7556).
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TJW, JAJ, JTK, CPL conceived and designed the study; TJW conducted field data collection; JTK led reintroduction efforts; TJW conducted data analyses; TJW wrote the manuscript and all authors discussed results and contributed to the final manuscript; JAJ secured funding.
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All capture and handling methods were approved by the South Dakota State University Institutional Animal Care and Use Committee (Approval No. 14-096A). Access to private property, when needed, was done so with landowner permission. No threatened or protected species were involved in this research.
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Werdel, T.J., Jenks, J.A., Kanta, J.T. et al. Space use and movement patterns of translocated bighorn sheep. Mamm Biol 101, 329–344 (2021). https://doi.org/10.1007/s42991-021-00107-4
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DOI: https://doi.org/10.1007/s42991-021-00107-4