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- Colinus virginianus (2)
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- Ducks; waterfowl densities (1)
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- Financial analysis (1)
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- Height-diameter prediction (1)
- Hydrogeomorphic (HGM) (1)
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Articles 1 - 18 of 18
Full-Text Articles in Forest Sciences
It's Time To Check The Nets: Research And Conservation Of Rafinesque Big-Eared Bats In East Texas, Christopher E. Comer
It's Time To Check The Nets: Research And Conservation Of Rafinesque Big-Eared Bats In East Texas, Christopher E. Comer
Faculty Publications
No abstract provided.
A Mixed-Effects Height-Diameter Model For Pinus Densiflora Trees In Gangwon Province, Korea, Young Jin Lee, Dean W. Coble, Jung Kee Pyo, Sung Ho Kim, Woo Kyun Lee, Jung Kee Choi
A Mixed-Effects Height-Diameter Model For Pinus Densiflora Trees In Gangwon Province, Korea, Young Jin Lee, Dean W. Coble, Jung Kee Pyo, Sung Ho Kim, Woo Kyun Lee, Jung Kee Choi
Articles
A new mixed-effects model was developed that predicts individual-tree total height for Pinus densiflora trees in Gangwon province as a function of individual-tree diameter (cm). The mixed-effects model contains two random-effects parameters. Maximum likelihood estimation was used to fit the model to 560 height-diameter observations of individual trees measured throughout Gwangwon province in 2007 as part of the National Forest Inventory Program in Korea. The new model is an improvement over fixed effects models because it can be calibrated to a local area, such as an inventory plot or individual stand. The new model also appears to be an improvement …
Habitat Selection By Anolis Carolinensis (Green Anole) In Open Pine Forests In Eastern Texas, Richard R. Schaefer, Robert R. Fleet, D. Craig Rudolph, Nancy E. Koerth
Habitat Selection By Anolis Carolinensis (Green Anole) In Open Pine Forests In Eastern Texas, Richard R. Schaefer, Robert R. Fleet, D. Craig Rudolph, Nancy E. Koerth
Faculty Publications
We initiated a mark-recapture study to determine the effects of shrub density on Anolis carolinensis (Green Anole) populations. Green Anole perch site, shrub species, and shrub volume preferences were also examined. We established two study plots of different shrub densities in open pine forests on the Angelina National Forest in eastern Texas. In late spring, the Green Anole population at the higher shrub-density plot was estimated to be 16 times greater than the population at the lower shrub-density plot. Green Anoles most commonly perched on live shrubs, but exhibited very little preference or avoidance of any particular species of live …
A New Whole-Stand Model For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble
A New Whole-Stand Model For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble
Faculty Publications
A new compatible whole-stand growth-and-yield model to predict total tree cubic-foot volume per acre yield (outside and inside bark) was developed for unmanaged loblolly pine (Pinus taeda) and slash pine (Pinus elliottii) plantations in East Texas. This model was compared with the noncompatible whole-stand model of Lenhart (Lenhart, 1996, Total and partial stand-level yield prediction for loblolly and slash pine plantations in east Texas, South. J. Appl. For. 20(1):36–41) and the Lenhart (1996) model refit to current data. For the two species, all three models were evaluated with independent observed data. The model developed in this study outperformed both Lenhart …
Habitat Use Of American Alligators In East Texas, Warren C. Conway, Kevin Webb, Gary Calkins, Jeffrey Duguay
Habitat Use Of American Alligators In East Texas, Warren C. Conway, Kevin Webb, Gary Calkins, Jeffrey Duguay
Faculty Publications
The American alligator (Alligator mississippiensis) has made a remarkable recovery throughout its range during the last halfcentury. In Texas, USA, current inland alligator population and harvest management strategies rely on generalized and often site-specific habitat and population data generated from coastal populations, because it is assumed that habitat and demographic similarities exist between inland and coastal populations. These assumptions have not been verified, however, and no studies have specifically examined inland alligator habitat use in Texas. We quantified alligator habitat use in East Texas during 2003–2004 to address this information gap and to facilitate development of regionally specific management strategies. …
Recovery Of Nesting Bald Eagles In Texas (Abstract), Sarah T. Saalfeld, Warren C. Conway
Recovery Of Nesting Bald Eagles In Texas (Abstract), Sarah T. Saalfeld, Warren C. Conway
Faculty Publications
One of the most successful conservation stories in United States' history resulted in Haliaeetus leucocephalus (Bald Eagle) being removed recently from the federal endangered species list. Few studies, however, have documented regional long-term recovery trends for Bald Eagles. We quantified Bald Eagle nesting density, distribution, and productivity trends by using aerial surveys of nests located 69 counties in eastern Texas from 1971-2005. The total number of occupied nests, productive nests, and offspring produced increased exponentially during that time with the most dramatic increases occurring from 1995-2005. Since 1971, the total number of occupied nests increased 13% per year, from 5 …
Wintering Yellow-Bellied Sapsucker Time Activity Budgets In East Texas Bottomland Hardwood Forests (Abstract), Jason R. Speights, Warren C. Conway
Wintering Yellow-Bellied Sapsucker Time Activity Budgets In East Texas Bottomland Hardwood Forests (Abstract), Jason R. Speights, Warren C. Conway
Faculty Publications
We developed time-activity budgets for 286 Yellow-bellied Sapsuckers (Sphyrapicus varius) from October 2005/2006 to March 2006/2007 in east Texas bottomland hardwood forests. Behaviors were similar between genders and study sites (P > 0.05), but varied (P = 0.008) between years. Sapsuckers spent more time foraging upon arrival in wintering areas and during morning throughout the study periods. Deviation from monthly average low temperature was an important (P = 0.038) covariate during the second study year, when sapsuckers increased time spent foraging during colder than average temperatures and increased time perching on days with warmer than average …
Invertebrate Biomass And Richness In Various Food Plot Types In East Texas, Charles W. Anderson, R. Montague Whiting Jr., Donald R. Dietz, Richard M. Capps
Invertebrate Biomass And Richness In Various Food Plot Types In East Texas, Charles W. Anderson, R. Montague Whiting Jr., Donald R. Dietz, Richard M. Capps
Faculty Publications
As northern bobwhite (Colinus virginianus) chicks are dependent on invertebrates for food, land managers often use spring/summer food plots to meet these needs. We examined invertebrate production in native vegetation and 6 different food plot types (i.e., fallow disking only; fallow disking and fertilizing; or disking, fertilizing, and planting a single species [browntop millet, iron and clay peas, or sorghum] or a multi-species mix [browntop millet, catjang peas, iron and clay peas, Japanese millet, and pearl millet]) in the Pineywoods of east Texas. Invertebrates were collected weekly during the summers of 1997 and 1999 and for 5 weekly sampling periods …
Winter Food Habits And Preferences Of Northern Bobwhites In East Texas, Donald R. Dietz, R. Montague Whiting Jr., Nancy E. Koerth
Winter Food Habits And Preferences Of Northern Bobwhites In East Texas, Donald R. Dietz, R. Montague Whiting Jr., Nancy E. Koerth
Faculty Publications
During late winter, 1994 and 1995, we investigated food habits and preferences of northern bobwhites (Colinus virginianus; hereafter, bobwhites) collected on forested lands in east Texas. Crops for bobwhites were collected from areas under 3 management regimes, namely intensively managed for bobwhites (QMA) (i.e., tree basal area reduced, annually burned, numerous multi-stage food plots, etc.), extensively managed for timber and wildlife (NBS) (i.e., burned every 3-5 years, scattered 2-stage food plots with corn feeders), and unmanaged for wildlife (i.e., burned every 5-7 years). With years pooled, partridge pea (Cassia fasciculata), Hercules club (Zanthoxylum clava-herculis), and pine (Pinus spp.) seeds, and …
Forval: Computer Software Package For Agricultural And Natural Resources Investment Analysis, T. J. Straka, Steven H. Bullard
Forval: Computer Software Package For Agricultural And Natural Resources Investment Analysis, T. J. Straka, Steven H. Bullard
Faculty Publications
The valuation of agricultural and natural resource investments presents challenging analysis problems that often require the use of computer software. Most of these computer packages are complex and costly. FORVAL is a free, user-friendly, menu-driven, agricultural and natural resource investment analysis package. It can accommodate any investment scenario and includes the standard financial criteria (net present value, rate of return, equal annual income, benefit/cost ratio, and land expectation value for forestry investments). FORVAL accommodates various cash flows like single sum, terminating annual and periodic series, and perpetual annual and periodic series. It also has options for payment and price projections.
Ghosts Of Nacogdoches Historical Trail, David Kulhavy, Michael Clanahan, Daniel Unger, Donald Brahman
Ghosts Of Nacogdoches Historical Trail, David Kulhavy, Michael Clanahan, Daniel Unger, Donald Brahman
Faculty Presentations
Welcome to the Ghosts of Nacogdoches Historic Trail. Open to all, this city trail is sponsored and maintained by the East Texas Area Council of the Boy Scouts of America. Throughout the United States of America the Boy Scouts encourage the hiking of National Historic Trails to increase the awareness of Boy Scouts towards the remarkable history of our country. The Ghosts of Nacogdoches Historic Trail is intended to focus narrowly on the importance of Nacogdoches as a hub of Western expansion and frontier development. An astute student will pick up the flavor of the Oldest Town in Texas and …
Assessing Impact Of Hurricane Rita On Habitat Red-Cockaded Woodpecker (Picoides Borealis) Clusters In Angelina National Forest, Texas, David Kulhavy, Jose Gonzales, Daniel Unger, I-Kuai Hung
Assessing Impact Of Hurricane Rita On Habitat Red-Cockaded Woodpecker (Picoides Borealis) Clusters In Angelina National Forest, Texas, David Kulhavy, Jose Gonzales, Daniel Unger, I-Kuai Hung
Faculty Presentations
Red-cockaded Woodpecker (RCW) habitat on the northern portion of the Angelina National Forest is composed primarily of loblolly and shortleaf pine with a significant hardwood component, especially in the midstory. Intensive management of RCW habitat in Angelina National Forest in Texas is a priority for this endangered species. The research inventoried downed timber in endangered red-cockaded woodpecker clusters on the Angelina National Forest in Texas following Hurricane Rita and utilized a geographic information system to analyze and display data to assess RCW habitat. In the Bannister Wildlife Management Unit of the Angelina National Forest, pine trees either uprooted or snapped …
Advanced Digital Image Processing Techniques For Natural Resource Assessment At Stephen F. Austin State University, Daniel Unger
Advanced Digital Image Processing Techniques For Natural Resource Assessment At Stephen F. Austin State University, Daniel Unger
Faculty Presentations
Graduate course work concentrating on land cover classification and digital image processing within the Arthur Temple College of Forestry and Agriculture at Stephen F. Austin State University is presented.
Evaluating Forest Volume Estimation At Barksdale Air Force Base Using Lidar And Multispectral Imagery, Richard E. Brooks, Daniel Unger, Hans Michael Williams, I-Kuai Hung
Evaluating Forest Volume Estimation At Barksdale Air Force Base Using Lidar And Multispectral Imagery, Richard E. Brooks, Daniel Unger, Hans Michael Williams, I-Kuai Hung
Faculty Presentations
Hardwood and pine stand volume estimates compiled from past field plot samples were compared to Lidar volume estimates through the interpretation of Lidar assessed height, crown width and trees per acre to ascertain if Lidar derived volume estimates can be used in lieu of traditional volume measurements.
Assessing Ecological Functions Of Bottomland Hardwood Wetlands Using Remote Sensing And Geographic Information Systems, Rachel Mcnamee, Hans Michael Williams, Kenneth W. Farrish, I-Kuai Hung, Daniel Unger
Assessing Ecological Functions Of Bottomland Hardwood Wetlands Using Remote Sensing And Geographic Information Systems, Rachel Mcnamee, Hans Michael Williams, Kenneth W. Farrish, I-Kuai Hung, Daniel Unger
Faculty Presentations
Bottomland hardwoods are one of the most rapidly diminishing wetland ecosystems due to agricultural clearing, development, and reservoir construction. As society has become more aware of the functions of wetlands, so has the importance in conservation of these valuable resources. The objective of this study was to compare the accuracy of Remote Sensing and GIS based functional assessment to the field based Hydrogeomorphic (HGM) approach. Remote sensing models were developed using a combination of soil maps, soil information, QuickBird ® multispectral satellite imagery, LiDAR derived Digital Elevation Model (DEM), and LiDAR derived Canopy Height Model. Results, although mixed, indicated that …
Estimating Waterfowl Densities In A Flooded Forest: A Comparison Of Methods, R. Montague Whiting Jr., J. Paul Cornes
Estimating Waterfowl Densities In A Flooded Forest: A Comparison Of Methods, R. Montague Whiting Jr., J. Paul Cornes
Faculty Presentations
During winter, aerial surveys are used to estimate densities of ducks that occupy open-water habitats. However, such surveys are ineffective for sampling forest-dwelling species, especially Aix sponsa (Wood Ducks), Anas platyrhynchos (Mallards), and Lophodytes cucullatus (Hooded Mergansers). We evaluated fixed-radius plot (FRP) and Reynolds and Goodrum variable-radius plot (VRP) methods for estimating waterfowl densities in a flooded hardwood bottomland. We constructed 15 elevated blinds on the Angelina River flood plain in eastern Texas and established a 1-ha FRP around each blind; color-coded markers were placed at fixed intervals from each blind. Observers surveyed waterfowl from blinds for 21 mornings during …
Ecological Parameters Of Coluber Constrictor Etheridgei, With Comparisons To Other Coluber Constrictor Subspecies, Robert R. Fleet, D. Craig Rudolph, J. D. Camper, J. Niederhofer
Ecological Parameters Of Coluber Constrictor Etheridgei, With Comparisons To Other Coluber Constrictor Subspecies, Robert R. Fleet, D. Craig Rudolph, J. D. Camper, J. Niederhofer
Faculty Publications
In 1998, we conducted a radio-telemetry study of Coluber constrictor etheridgei (Tan Racer) in the Angelina National Forest in eastern Texas. Individuals were located once daily from 12 June to 14 August. We determined home-range size, movement distances, movement frequency, and habitat use for this short-term study. We also determined food habits of this population by examination of fecal samples. We compared these parameters to other Racer taxa in Utah (C. c. mormon [Western Yellow-bellied Racer]), Kansas (C. c. fl aviventris [Eastern Yellow-bellied Racer]), and South Carolina (C.c. priapus [Southern Black Racer]). Compared to these populations, Texas Racers exhibited larger …
Integration Of Modified Universal Soil Loss Equation (Musle) Into A Gis Framework To Assess Soil Erosion Risk, Yanli Zhang, J. Degroote, Calvin Wolter, Ramanathan Sugumaran
Integration Of Modified Universal Soil Loss Equation (Musle) Into A Gis Framework To Assess Soil Erosion Risk, Yanli Zhang, J. Degroote, Calvin Wolter, Ramanathan Sugumaran
Faculty Publications
Soil erosion is an important economic and environmental concern throughout the world. In order to assess soil erosion risk and conserve water and soil resources, soil erosion modeling at the watershed scale is urgently needed. This study integrated the Modified Universal Soil Loss Equation (MUSLE) in a Geographic Information System (GIS) framework in the form of a tool called ArcMUSLE, an extension of ArcGIS® software, to assist soil and water conservation agencies in soil erosion risk assessment and prioritization of critical areas for soil erosion control practices. With widely available spatial data, this tool can be applied to determine curve …