Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Animal Sciences (3)
- Ecology and Evolutionary Biology (3)
- Life Sciences (3)
- Population Biology (2)
- Social and Behavioral Sciences (2)
-
- Agricultural and Resource Economics (1)
- Cultural History (1)
- Environmental Sciences (1)
- Environmental Studies (1)
- Geography (1)
- History (1)
- Ornithology (1)
- Other Animal Sciences (1)
- Physical Sciences and Mathematics (1)
- Poultry or Avian Science (1)
- Public Affairs, Public Policy and Public Administration (1)
- Terrestrial and Aquatic Ecology (1)
- United States History (1)
Articles 1 - 4 of 4
Full-Text Articles in American Studies
Reproduction And Population Characteristics Of White-Tailed Jackrabbits In South Dakota, Charles Dieter, Dustin Schaible
Reproduction And Population Characteristics Of White-Tailed Jackrabbits In South Dakota, Charles Dieter, Dustin Schaible
Great Plains Research: A Journal of Natural and Social Sciences
We evaluated the reproductive biology of314 white-tailed jackrabbits (Lepus townsendii) in 44 counties throughout South Dakota from June 2004 to September 2005. We classified jackrabbits as juveniles or adults based on the closure of the proximal epiphysis of the humerus using X-ray analysis. We determined annual reproductive activity through fluctuations in measured weights of reproductive organs for both sexes. The 2005 breeding season started in late February and proceeded until mid-July, approximately 142 days, allowing for females to potentially produce 3.3 litters. We found four distinct breeding periods by the overlap of estimated conception and parturition dates. Mean …
Health And Fertility Implications Related To Seasonal Changes In Kidney Fat Index Of White-Tailed Jackrabbits In South Dakota, Dustin Schaible, Charles D. Dieter
Health And Fertility Implications Related To Seasonal Changes In Kidney Fat Index Of White-Tailed Jackrabbits In South Dakota, Dustin Schaible, Charles D. Dieter
Great Plains Research: A Journal of Natural and Social Sciences
White-tailed jackrabbit (Lepus townsendii) populations in the Northern Plains have been in a general decline for the past decade or longer. A suggested reason for this population decline was reduced body condition of individual jackrabbits due to habitat changes. In order to evaluate body condition, we determined the kidney fat index of 314 white-tailed jackrabbits harvested in 44 counties throughout South Dakota. We removed and weighed kidneys and all perirenal fat associated with the kidneys from collected jackrabbits. We measured kidney weight to determine times of high metabolic activity as indicated by an increase in mass. Body condition was …
Historic And Contemporary Trends Of The Conservation Reserve Program And Ring-Necked Pheasants In South Dakota, Christopher R. Laingen
Historic And Contemporary Trends Of The Conservation Reserve Program And Ring-Necked Pheasants In South Dakota, Christopher R. Laingen
Great Plains Research: A Journal of Natural and Social Sciences
Over the past century, the interactions between agricultural land use and government cropland retirement programs have affected pheasant population change. Two government land retirement programs that returned croplands to grasslands, Soil Bank in the 1960s and the current Conservation Reserve Program (CRP), help to illustrate these connections. From 2007 to 2010, South Dakota lost 41% of its CRP lands and experienced an 18% decline in pheasants per mile. However, because of where CRP expirations have occurred and where pheasant populations are found, some regional variability is seen. Western South Dakota (Region 1) had an 80% increase in pheasants per mile …
Wish List Wilderness Endgame In The Black Hills National Forest, Robert Wellman Campbell
Wish List Wilderness Endgame In The Black Hills National Forest, Robert Wellman Campbell
Great Plains Quarterly
In January 1979 Dave Foreman loosened his tie, propped his cowboy boots up on his desk, and brooded awhile on RARE II. In a second try at Roadless Area Review and Evaluation (RARE), the u.s. Forest Service had just spent two years deciding once and for all how much of its undeveloped land should be designated Wilderness. To Foreman, a Washington executive of the Wilderness Society, RARE II tasted of bitter defeat, and he lonesomely "popped the top on another Stroh's" as he brooded. The Forest Service had just recommended increasing its Wilderness acres from 18 million to 33 million, …