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Full-Text Articles in Life Sciences
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 …
Re-Evaluating Neonatal-Age Models For Ungulates: Does Model Choice Affect Survival Estimates?, Troy W. Grovenburg, Kevin L. Monteith, Christopher N. Jacques, Robert W. Klaver, Christopher S. Deperno, Sophie L. Gilbert, Todd J. Brinkman, Kyle B. Monteith, Joshua B. Smith, Vernon C. Bleich, Christopher C. Swanson, Jonathan A. Jenks
Re-Evaluating Neonatal-Age Models For Ungulates: Does Model Choice Affect Survival Estimates?, Troy W. Grovenburg, Kevin L. Monteith, Christopher N. Jacques, Robert W. Klaver, Christopher S. Deperno, Sophie L. Gilbert, Todd J. Brinkman, Kyle B. Monteith, Joshua B. Smith, Vernon C. Bleich, Christopher C. Swanson, Jonathan A. Jenks
Natural Resource Management Faculty Publications
New-hoof growth is regarded as the most reliable metric for predicting age of newborn ungulates, but variation in estimated age among hoof-growth equations that have been developed may affect estimates of survival in staggered-entry models. We used known-age newborns to evaluate variation in age estimates among existing hoof-growth equations and to determine the consequences of that variation on survival estimates. During 2001–2009, we captured and radiocollared 174 newborn (#24-hrs old) ungulates: 76 white-tailed deer (Odocoileus virginianus) in Minnesota and South Dakota, 61 mule deer (O. hemionus) in California, and 37 pronghorn (Antilocapra americana) in South Dakota. Estimated age of known-age …
Disease And Predation: Sorting Out Causes Of A Bighorn Sheep (Ovis Canadensis) Decline, Joshua B. Smith, Jonathan A. Jenks, Troy Grovenburg, Robert W. Klaver
Disease And Predation: Sorting Out Causes Of A Bighorn Sheep (Ovis Canadensis) Decline, Joshua B. Smith, Jonathan A. Jenks, Troy Grovenburg, Robert W. Klaver
Natural Resource Management Faculty Publications
Estimating survival and documenting causes and timing of mortality events in neonate bighorn sheep (Ovis canadensis) improves understanding of population ecology and factors influencing recruitment. During 2010–2012, we captured and radiocollared 74 neonates in the Black Hills, South Dakota, of which 95% (70) died before 52 weeks of age. Pneumonia (36%) was the leading cause of mortality followed by predation (30%). We used known fate analysis in Program MARK to estimate weekly survival rates and investigate the influence of intrinsic variables on 52-week survival. Model {S1 wk, 2–8 wks, .8 wks} had the lowest AICc (Akaike’s Information Criterion corrected for …
Environmental Variables Measured At Multiple Spatial Scales Exert Uneven Influence On Fish Assemblages Of Floodplain Lakes, Daniel J. Dembkowski, L.E. Miranda
Environmental Variables Measured At Multiple Spatial Scales Exert Uneven Influence On Fish Assemblages Of Floodplain Lakes, Daniel J. Dembkowski, L.E. Miranda
Natural Resource Management Faculty Publications
We examined the interaction between environmental variables measured at three different scales (i.e., landscape, lake, and in-lake) and fish assemblage descriptors across a range of over 50 floodplain lakes in the Mississippi Alluvial Valley of Mississippi and Arkansas. Our goal was to identify important local- and landscape-level determinants of fish assemblage structure. Relationships between fish assemblage structure and variables measured at broader scales (i.e., landscape-level and lake-level) were hypothesized to be stronger than relationships with variables measured at finer scales (i.e., in-lake variables). Results suggest that fish assemblage structure in floodplain lakes was influenced by variables operating on three different …
Phenology Of Annulus Formation In Walleye And Smallmouth Bass Otoliths, Brianna J. Graff, Daniel J. Dembkowski, Melissa R. Wuellner
Phenology Of Annulus Formation In Walleye And Smallmouth Bass Otoliths, Brianna J. Graff, Daniel J. Dembkowski, Melissa R. Wuellner
Natural Resource Management Faculty Publications
Walleye Sander vitreus and smallmouth bass Micropterus dolomieu were sampled monthly (May-October) from Lake Sharpe, South Dakota during 2006 and 2007 to estimate the timing of otolith annulus formation and to evaluate the influence of fish age, sex, and sample location (walleye only) on the timing and detection of annulus formation. Timing of annulus formation was evaluated using marginal increment analysis. Walleye samples were stratified by age, sex, and sample location (i.e., upper and lower Lake Sharpe) and smallmouth bass samples were stratified by age and sex. Monthly mean marginal increment measurements for both species generally increased from May to …
Gape:Body Size Relationship For Smallmouth Bass, Craig L. Schake, Daniel J. Dembkowski, Melissa R. Wuellner
Gape:Body Size Relationship For Smallmouth Bass, Craig L. Schake, Daniel J. Dembkowski, Melissa R. Wuellner
Natural Resource Management Faculty Publications
The types and sizes of prey fishes consumed by predatory fish often are limited by gape dimensions of the predator (Slaughter and Jacobson 2008). In general, the size of prey consumed is positively related to predator size when prey are available across a wide range of sizes (Werner and Hall 1974). Opportunistic predators with large gape dimensions, such as smallmouth bass (Micropterus dolomieu), may consume a wide range of prey types and sizes, thereby exerting top-down influences on prey population dynamics and potentially restructuring aquatic communities (e.g., Werner and Hall 1974, Jackson 2002). Although feeding ecology of smallmouth bass varies …