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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
The Ecology Of Human-Caused Mortality For A Protected Large Carnivore, John F. Benson, Kyle D. Dougherty, Paul Beier, Walter M. Boyce, Bogdan Cristescu, Daniel J. Gammons, David K. Garcelon, J. Mark Higley, Quinton E. Martins, Anna C. Nisi, Seth P. D. Riley, Jeff A. Sikich, Thomas R. Stephenson, T. Winston Vickers, Greta M. Wengert, Christopher C. Wilmers, Heiko U. Wittmer, Justin A. Dellinger
The Ecology Of Human-Caused Mortality For A Protected Large Carnivore, John F. Benson, Kyle D. Dougherty, Paul Beier, Walter M. Boyce, Bogdan Cristescu, Daniel J. Gammons, David K. Garcelon, J. Mark Higley, Quinton E. Martins, Anna C. Nisi, Seth P. D. Riley, Jeff A. Sikich, Thomas R. Stephenson, T. Winston Vickers, Greta M. Wengert, Christopher C. Wilmers, Heiko U. Wittmer, Justin A. Dellinger
School of Natural Resources: Faculty Publications
Mitigating human-caused mortality for large carnivores is a pressing global challenge for wildlife conservation. However, mortality is almost exclusively studied at local (within-population) scales creating a mismatch between our understanding of risk and the spatial extent most relevant to conservation and management of wide-ranging species. Here, we quantified mortality for 590 radio-collared mountain lions statewide across their distribution in California to identify drivers of human-caused mortality and investigate whether human-caused mortality is additive or compensatory. Human-caused mortality, primarily from conflict management and vehicles, exceeded natural mortality despite mountain lions being protected from hunting. Our data indicate that human-caused mortality is …
White-Tailed Deer (Odocoileus Virginianus) Fawn Survival And The Influence Of Landscape Characteristics On Fawn Predation Risk In The Southern Appalachian Mountains, Usa, Andrew R. Little, A. C. Edge, J. P. Rosenberger, C. J. Yates, C. H. Killmaster, K. L. Johannsen Et Al.
White-Tailed Deer (Odocoileus Virginianus) Fawn Survival And The Influence Of Landscape Characteristics On Fawn Predation Risk In The Southern Appalachian Mountains, Usa, Andrew R. Little, A. C. Edge, J. P. Rosenberger, C. J. Yates, C. H. Killmaster, K. L. Johannsen Et Al.
School of Natural Resources: Faculty Publications
No abstract provided.
Survival And Growth Assessment After Reintroduction Of The Pocketbook Mussel, Lampsilis Cardium Rafinesque, 1820 Among Three Streams In Nebraska (Usa), F. Montesanto, L. M. Ohlman, Mark A. Pegg
Survival And Growth Assessment After Reintroduction Of The Pocketbook Mussel, Lampsilis Cardium Rafinesque, 1820 Among Three Streams In Nebraska (Usa), F. Montesanto, L. M. Ohlman, Mark A. Pegg
School of Natural Resources: Faculty Publications
No abstract provided.
Survival And Competing Mortality Risks Of Mountain Lions In A Major Metropolitan Area, John F. Benson, Jeff A. Sikich, Seth P.D. Riley
Survival And Competing Mortality Risks Of Mountain Lions In A Major Metropolitan Area, John F. Benson, Jeff A. Sikich, Seth P.D. Riley
School of Natural Resources: Faculty Publications
Understanding natural and human-caused mortality for top predators persisting in human-dominated landscapes is critical for conserving their populations. We estimated survival and cause-specific mortality rates and investigated factors influencing mortality risk of mountain lions by radio-tracking 58 individuals (33 males, 25 females) across the highly fragmented landscape in greater Los Angeles, California from 2002 to 2019. Mortality risk did not differ strongly between subadults (annual survival [ŝ]=0.68, SE=0.08) and adults (ŝ=0.81, SE=0.04). However, the different age-classes were subjected to mortality risks from different sources as subadults were more likely to be killed by conspecifics, whereas adults were more likely to …
Nest Site Selection And Nest Survival Of Eastern Wild Turkeys In A Pyric Landscape, Nathan A. Yeldell, Bradley S. Cohen, Andrew R. Little, Bret A. Collier, Michael J. Chamberlain
Nest Site Selection And Nest Survival Of Eastern Wild Turkeys In A Pyric Landscape, Nathan A. Yeldell, Bradley S. Cohen, Andrew R. Little, Bret A. Collier, Michael J. Chamberlain
School of Natural Resources: Faculty Publications
Pine (Pinus spp.)-dominated forests are commonly managed with prescribed fire in the southeastern United States to reduce fuel loads, maintain diverse plant communities, and increase habitat quality for wildlife. Prescribed fire alters understory vegetation, which is a key component of nesting habitat for ground-nesting birds. We assessed the influences of vegetation, prescribed fire, and landscape features (e.g., roads, edge) on nest site selection and nest survival of eastern wild turkeys (Meleagris gallopavo silvestris) in a pine-dominated ecosystem in west-central Louisiana. We radio-marked 55 female wild turkeys and evaluated vegetation and landscape characteristics associated with 69 nests during the …
Assessment Of A Channel Catfish Population In A Large Open River System, A. J. Blank, M. J. Hamel, Jonathan J. Spurgeon, Mark A. Pegg
Assessment Of A Channel Catfish Population In A Large Open River System, A. J. Blank, M. J. Hamel, Jonathan J. Spurgeon, Mark A. Pegg
School of Natural Resources: Faculty Publications
Estimates of dynamic rate functions for riverine channel catfish, Ictalurus punctatus (Rafinesque), populations are limited. The open nature and inherent difficulty in sampling riverine environments and the propensity for dispersal of channel catfish impede estimation of population variables. However, contemporary population models (i.e. robust design models) can incorporate the open nature of these systems. The purpose of this study was to determine channel catfish population abundance, survival and size structure and to characterize growth in the lower Platte River, Nebraska, USA. Annual survival estimates of adult channel catfish were 13%–49%, and channel catfish abundance estimates ranged from 8,281 to 24,261 …
Survival And Cause-Specific Mortality Of Female Eastern Wild Turkeys In Two Frequently-Burned Longleaf Pine Savannas, Andrew R. Little, John F. Benson, Michael J. Chamberlain, L. Mike Conner, Robert J. Warren
Survival And Cause-Specific Mortality Of Female Eastern Wild Turkeys In Two Frequently-Burned Longleaf Pine Savannas, Andrew R. Little, John F. Benson, Michael J. Chamberlain, L. Mike Conner, Robert J. Warren
School of Natural Resources: Faculty Publications
Longleaf pine savannas have declined throughout the southeastern United States due to land-use change. Fortunately, natural resource professionals are currently restoring these ecologically and economically important savannas. Although efforts are underway to restore longleaf pine savannas, little information exists on female eastern wild turkey Meleagris gallopavo silvestris population dynamics in these systems. Therefore, we evaluated survival and cause-specific mortality of female eastern wild turkeys in two longleaf pine savannas in southwestern Georgia. We radio-marked 126 female wild turkeys during 2010–2013 and monitored their survival; 66 (52.4%) radio-marked females died during the study. We estimated causes of death for 37 mortality …
Parent-Offspring Resemblance In Colony-Specific Adult Survival Of Cliff Swallows, Charles R. Brown, Erin A. Roche, Mary Bomberger Brown
Parent-Offspring Resemblance In Colony-Specific Adult Survival Of Cliff Swallows, Charles R. Brown, Erin A. Roche, Mary Bomberger Brown
School of Natural Resources: Faculty Publications
Survival is a key component of fitness. Species that occupy discrete breeding colonies with different characteristics are often exposed to varying costs and benefits associated with group size or environmental conditions, and survival is an integrative net measure of these effects. We investigated the extent to which survival probability of adult (≥ 1-year old) cliff swallows (Petrochelidon pyrrhonota) occupying different colonies resembled that of their parental cohort and thus whether the natal colony had long-term effects on individuals. Individuals were cross-fostered between colonies soon after hatching and their presence as breeders monitored at colonies in the western Nebraska …
Evaluation Of The Effects Of September Hunting Seasons On Canada Geese In Nebraska, Scott R. Groepper, Mark P. Vrtiska, Larkin A. Powell, Scott E. Hygnstrom
Evaluation Of The Effects Of September Hunting Seasons On Canada Geese In Nebraska, Scott R. Groepper, Mark P. Vrtiska, Larkin A. Powell, Scott E. Hygnstrom
School of Natural Resources: Faculty Publications
Populations of temperate-nesting Canada geese (Branta canadensis) have increased in Nebraska, USA, resulting in an increased number of nuisance and damage complaints. September hunting seasons were initiated in southeastern Nebraska in 2004 to reduce populations of Canada geese. We analyzed band recoveries from Canada geese banded in southeastern Nebraska during their hatch-year (HY) or after-hatch-year (AHY) to determine whether September hunting seasons affected survival, harvest, and recovery rates. Survival analyses revealed that HY geese had higher survival than AHY geese (SAHY = 0.696, 95% CI = 0.679–0.713; SHY = 0.896, 95% CI = 0.786–0.953) and September seasons did …
Mid-Contract Management Of Conservation Reserve Program Grasslands Provides Benefits For Ring-Necked Pheasant Nest And Brood Survival, Ty W. Matthews, J. Scott Taylor, Larkin A. Powell
Mid-Contract Management Of Conservation Reserve Program Grasslands Provides Benefits For Ring-Necked Pheasant Nest And Brood Survival, Ty W. Matthews, J. Scott Taylor, Larkin A. Powell
School of Natural Resources: Faculty Publications
Conservation Reserve Program (CRP) fields may provide good habitat for nesting and brood-rearing ring-necked pheasants (Phasianus colchicus) during early stages of succession. But, the success of hens in early successional CRP, relative to late successional CRP and other grassland habitats, has yet to be evaluated. The reproductive period is especially critical for populations of pheasants, and CRP’s benefits to hens and chicks may decrease as fields age because of loss of vegetative diversity, decrease in vegetation density, and accumulation of residual litter. During 2005– 2006, we evaluated spatial and temporal variation in nest and brood survival for radio-marked hen pheasants …
Translocation To A Fragmented Landscape: Survival, Movement, And Site Fidelity Of Northern Bobwhites, Theron M. Terhune, D. Clay Sisson, William E. Palmer, Brant C. Faircloth, H. Lee Stribling, John P. Carroll
Translocation To A Fragmented Landscape: Survival, Movement, And Site Fidelity Of Northern Bobwhites, Theron M. Terhune, D. Clay Sisson, William E. Palmer, Brant C. Faircloth, H. Lee Stribling, John P. Carroll
School of Natural Resources: Faculty Publications
Habitat fragmentation, degradation, and loss have taxed early-successional species including the Northern Bobwhite (Colinus virginianus) and numerous grassland obligate birds. Translocation is often applied to counteract the consequences of habitat fragmentation through the creation, reestablishment, or augmentation of wild populations for the purposes of conservation, biodiversity maintenance. However, the implementation of these techniques is often conducted without valid experimental designs and therefore lacks robust, empirical data needed to evaluate and advance the knowledge and application of translocation. Despite the increasing amount of habitat management applied to patches among fragmented landscapes, a paucity of source populations often limits natural …
Survival Rates And Recovery Distributions Of Canada Geese Banded In Nebraska, Larkin A. Powell, Mark Vrtiska, Nick Lyman
Survival Rates And Recovery Distributions Of Canada Geese Banded In Nebraska, Larkin A. Powell, Mark Vrtiska, Nick Lyman
School of Natural Resources: Faculty Publications
We analyzed banding and recovery data for Canada geese (Branta canadensis) banded in Nebraska during 1990–2000. Survival rates were lower during 1996–2000 (adult: 0.688, SE = 0.016; juvenile: 0.611, SE = 0.029), than 1990–1995 (adult: 0.727, SE = 0.011; juvenile: 0.639, SE = 0.024). Average juvenile-to-adult ratio from banding data was 0.834 (SD = 0.485), resulting in an annual population growth rate (λ) estimate for 1990–1995 of 0.995 (95% CI = 0.021), and 0.922 (0.018) for 1996–2000. Our recovery analysis suggests that 67% of geese banded in Nebraska are shot in Nebraska. Over 30% of both juvenile and adult recoveries …