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Do Movement Patterns And Habitat Use Differ Between Optimal- And Suboptimal-Sized Northern Bobwhite Coveys?, Christopher K. Williams, Roger Applegate, Anthony R. Ives
Do Movement Patterns And Habitat Use Differ Between Optimal- And Suboptimal-Sized Northern Bobwhite Coveys?, Christopher K. Williams, Roger Applegate, Anthony R. Ives
National Quail Symposium Proceedings
The group size of social animals and spatial structure of the environment can affect group behavior and movement decisions. Our objective was to investigate movement patterns and habitat use of northern bobwhite coveys (Colinus virginianus) of different size. Using radiotelemetry, we continuously monitored covey group size, daily movement, and habitat use on 12 independent 259-ha study areas in eastern Kansas, USA, during the winters between 1997 and 2000. We used correlated random walk models and fractal dimension models to determine if covey size affected movement characteristics or habitat selection. Intermediate-sized coveys (9–12 individuals, close to optimal covey size) …
Annual Variation In Northern Bobwhite Survival And Raptor Migration, R. Douglas Holt, L. Wes Burger Jr., Bruce D. Leopold, K. David Godwin
Annual Variation In Northern Bobwhite Survival And Raptor Migration, R. Douglas Holt, L. Wes Burger Jr., Bruce D. Leopold, K. David Godwin
National Quail Symposium Proceedings
We estimated survival of radio-marked northern bobwhite (Colinus virginianus) on a managed prairie site in northeast Mississippi during 2 disparate winters (15 Sep-14 Apr 2000–2002). We retrospectively examined factors that may influence bobwhite survival. Pooled survival rates differed substantially between years (S 1⁄4 0.03 6 0.02 in 2000–2001 and S 1⁄4 0.36 6 0.16 in 2001–2002). Regional relative abundance of 3 species of raptors thought to be important predators of bobwhite was greater during 2000 compared to 2001 based on kriging of Christmas Bird Count (CBC) data. We demonstrate an approach for characterizing annual variation in spatial distribution of migratory …
A Mid-Atlantic And A National Population Model Of Northern Bobwhite Demographic Sensitivity, Christopher K. Williams, Brett K. Sandercock, Michael Lohr, Paul M. Castelli
A Mid-Atlantic And A National Population Model Of Northern Bobwhite Demographic Sensitivity, Christopher K. Williams, Brett K. Sandercock, Michael Lohr, Paul M. Castelli
National Quail Symposium Proceedings
Numerous field studies have estimated fecundity and survival rates for northern bobwhites (Colinus virginianus), but a synthetic population model based on life-stage simulation analysis (LSA) was only recently developed to examine demographic sensitivity of the finite rate of population change. We compare local demographic parameters of bobwhite versus a national compilation to identify limiting demographic factors for improved regional habitat planning and management. The national compilation provided a useful overview but combined parameters across populations at different latitudes and under different management regimes. We parameterized our LSA model to examine the sensitivity of the finite rate of growth (k) to …
Over-Winter Survival Of Northern Bobwhite In Relation To Landscape Composition And Structure, R. Douglass Holt, Loren W. Burger Jr., Bruce D. Leopold, Dave Godwin
Over-Winter Survival Of Northern Bobwhite In Relation To Landscape Composition And Structure, R. Douglass Holt, Loren W. Burger Jr., Bruce D. Leopold, Dave Godwin
National Quail Symposium Proceedings
The conceptualization of security of bobwhite during winter has been predicated on the assumption that winter ranges differ in quality, based on habitat structure, composition, or interspersion. Although some studies have qualitatively related habitat composition to survival, no studies have quantitatively linked habitat or landscape characteristics to winter survival and the specific structural or compositional characteristics that influence quality are unknown. To quantify winter habitat quality, we modeled hazards as a function of habitat characteristics in relation to winter survival of radio-marked bobwhite (2000, n = 118 in 16 coveys; 2001, n = 49 in 7 coveys) in a managed …
Bobcat Predation On Quail, Birds, And Mesomammals, Michael E. Tewes, Jennifer M. Mock, John H. Young
Bobcat Predation On Quail, Birds, And Mesomammals, Michael E. Tewes, Jennifer M. Mock, John H. Young
National Quail Symposium Proceedings
We reviewed 54 scientific articles about bobcat (Lynx rufus) food habits to determine the occurrence of quail, birds, and mesopredators including red (Vulpes vulpes) and gray fox (Urocyon cinereoargenteus), raccoon (Procyon lotor), skunk (Mephitis spp.), and opossum (Didelphis virginianus). Quail (Colinus virginianus, Cyrtonyx montezumae, Callipepla squamata, C. gambelii, C. californica, Oreortyx pictus) were found in 9 diet studies and constituted 3% of the bobcat diet in only 2 of 54 studies. Birds occurred in 47 studies, but were also a minor dietary component in most studies. Although mesopredators were represented as bobcat prey in 33 of 47 studies, their percent …
Macrohabitat Composition Surrounding Successful And Depredated Northern Bobwhite Nests, Eric L. Staller, William E. Palmer, John P. Carroll
Macrohabitat Composition Surrounding Successful And Depredated Northern Bobwhite Nests, Eric L. Staller, William E. Palmer, John P. Carroll
National Quail Symposium Proceedings
Relationships among macrohabitat and depredation of northern bobwhite (Colinus virginianus) nests are poorly understood. Yet, macrohabitat composition may influence the nest predator community and, therefore, the vulnerability of northern bobwhite nests to depredation. We determined if macrohabitat composition surrounding bobwhite nests influenced nest placement, nest success, and which predators were responsible for depredating nests. We characterized macrohabitats at 2 scales, 8 and 16 ha, by surrounding both bobwhite nests, and an equal number of random locations, with a circular buffer. Random points were placed within the area used by bobwhites on our study area. We then determined the acreage of …
Survival Of Northern Bobwhite On Hunted And Nonhunted Study Areas In The North Carolina Sandhills, Charles F. Robinette, Phillip D. Doerr
Survival Of Northern Bobwhite On Hunted And Nonhunted Study Areas In The North Carolina Sandhills, Charles F. Robinette, Phillip D. Doerr
National Quail Symposium Proceedings
Radio-tagged northern bobwhite (Colinus virginianus) were monitored in the Sandhills region of North Carolina to investigate the influences of hunting on seasonal survival. We used the Kaplan-Meier product limit method with staggered entry design to calculate survival estimates and distributions for 79 radio-tagged bobwhite representing 33 coveys during November-February 1987-89. Estimated winter survival rates for year 1 (59%) and for pooled years (67%) in the nonhunted study areas were greater than in the hunted areas (31 and 45%, respectively; P < 0.05). Survival trends for the second winter were again greater in the nonhunted study areas (7 4%) but not different than hunted study areas (63%; P > 0.05). Avian predation was the major proximate cause of mortality, accounting for 66% of the known losses. Summer whistle count …
Potential Polygamous Breeding Behavior In Northern Bobwhite, Paul D. Curtis, Brad S. Mueller, Phillip D. Doerr, Charles F. Robinette, Theodore Devos
Potential Polygamous Breeding Behavior In Northern Bobwhite, Paul D. Curtis, Brad S. Mueller, Phillip D. Doerr, Charles F. Robinette, Theodore Devos
National Quail Symposium Proceedings
Breeding behavior ofradio-tagged northern bobwhite (Colinus uirginianus) was observed at Fort Bragg Military Reservation (n = 19), North Carolina, in 1985-88, and Tall Timbers Research Station (n = 27), Florida, during 1984-86. We observed apparent polygamous breeding behavior in 95% (18 of 19) of the radio-tagged northern bobwhite at Fort Bragg, and 93% (25 of 27) of the birds at Tall Timbers. We documented 5 cases of double-clutching by radio-tagged females. Twenty-seven percent of Fort Bragg clutches (n = 30), and 20% of Tall Timbers clutches (n = 56) were incubated by radio-tagged males. Northern bobwhite exhibited characteristics of both …
Northern Bobwhite (Colinus Virginianus) Population Ecology On Reclaimed Mined Lands, Evan Philip Tanner
Northern Bobwhite (Colinus Virginianus) Population Ecology On Reclaimed Mined Lands, Evan Philip Tanner
Masters Theses
The northern bobwhite (Colinus virginianus) has experienced range-wide population declines for the past half century. The primary cause has been large-scale habitat loss and fragmentation. Through auspices of the Surface Mining Control and Reclamation Act of 1977 (SMCRA), large tracts of early successional vegetation have been created throughout much of the bobwhite’s range that may be managed to increase usable space. Peabody WMA is a reclaimed coal mine in Western Kentucky where bobwhite have been present in the past. To better understand the dynamics of this population and how habitat on Peabody WMA influences these dynamics, my two …