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Full-Text Articles in Life Sciences
Invasion Is Contingent On Species Assemblage And Invasive Species Identity Inexperimental Rehabilitation Plots, A. Joshua Leffler, Eamonn D. Leonard, Jeremy J. James, Thomas A. Monaco
Invasion Is Contingent On Species Assemblage And Invasive Species Identity Inexperimental Rehabilitation Plots, A. Joshua Leffler, Eamonn D. Leonard, Jeremy J. James, Thomas A. Monaco
Natural Resource Management Faculty Publications
Ecological studies often suggest that diverse communities are most resistant to invasion by exotic plants, but relatively few local species may be available to a rehabilitation practitioner. We examine the ability of monocultures and diverse assemblages to resist invasion by an exotic annual grass (cheatgrass) and an exotic biennial forb (dyer’s woad) in experimental rehabilitation plots. We constructed seven assemblages that included three monocultures of grass, forb, or shrub; three four-species mixtures of grasses, forbs, or shrubs; and a three-species mixture of one species from each growth form in an experimental field setting to test resistance to invasion. Assemblages were …
Ad Hoc Smoothing Parameter Performance In Kernel Estimates Of Gps-Derived Home Ranges, Krysten L. Schuler, Greg M. Schroeder, Jonathan A. Jenks, John G. Kie
Ad Hoc Smoothing Parameter Performance In Kernel Estimates Of Gps-Derived Home Ranges, Krysten L. Schuler, Greg M. Schroeder, Jonathan A. Jenks, John G. Kie
Natural Resource Management Faculty Publications
Accuracy of home-range estimates in animals is influenced by a variety of factors, such as method of analysis and number of locations, but animal space use is less often considered and frequently over-generalized through simulations. Our objective was to assess effect of an ad hoc (h_ad hoc)smoothing parameter in kernel analysis from two species that were predicted to have different patterns of utilization distributions across a range of sample sizes. We evaluated variation in home-range estimates with location data collected from GPS collars on two species: mule deer Odocoileus hemionus and coyotes Canis latrans. We calculated home ranges using …
A New Perspective On Trait Differences Between Native And Invasive Exotic Plants, A. Joshua Leffler, Jeremy J. James, Thomas A. Monaco, Roger L. Sheley
A New Perspective On Trait Differences Between Native And Invasive Exotic Plants, A. Joshua Leffler, Jeremy J. James, Thomas A. Monaco, Roger L. Sheley
Natural Resource Management Faculty Publications
Functional differences between native and exotic species potentially constitute one factor responsible for plant invasion. Differences in trait values between native and exotic invasive species, however, should not be considered fixed and may depend on the context of the comparison. Furthermore, the magnitude of difference between native and exotic species necessary to trigger invasion is unknown. We propose a criterion that differences in trait values between a native and exotic invasive species must be greater than differences between co-occurring natives for this difference to be ecologically meaningful and a contributing factor to plant invasion. We used a meta-analysis to quantify …
Bed-Site Selection By Neonatal White-Tailed Deer In Central North Dakota, Brian A. Schaffer, Jonathan A. Jenks, Troy Grovenburg, William F. Jensen
Bed-Site Selection By Neonatal White-Tailed Deer In Central North Dakota, Brian A. Schaffer, Jonathan A. Jenks, Troy Grovenburg, William F. Jensen
Natural Resource Management Faculty Publications
Understanding bed-site selection and vegetation characteristics provides valuable information for population management (Verme 1977, Huegel et al. 1985a, Nelson and Woolf 1987). Predation and other natural-caused mortalities of white-tailed deer (Odocoileus virginianus) neonates are most likely to occur within the first 60 days of life; a time period when selected habitat characteristics are vital to survival (Verme 1977, Huegel et al. 1985a, Nelson and Woolf 1987, Grovenburg et al. 2010). Prior to the study of Grovenburg et al. (2010), limited research had been completed on bed-site selection of neonatal white-tailed deer in the grasslands of the Northern Great Plains. In …