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- Ducks; waterfowl densities (1)
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Articles 1 - 28 of 28
Full-Text Articles in Life 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.
Sfa Gardens Scrapbook 2005-2009, Sfa Gardens, Stephen F. Austin State University
Sfa Gardens Scrapbook 2005-2009, Sfa Gardens, Stephen F. Austin State University
SFA Gardens Scrapbooks
No abstract provided.
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 …
Soil And Plant Characteristics Compared Between Abandoned Natural Gas Drill Pads And Adjacent Areas, Barksdale Air Force Base, Louisiana, Adam J. Miller, Hans Michael Williams, Kenneth W. Farrish, Brian P. Oswald, Daniel Unger
Soil And Plant Characteristics Compared Between Abandoned Natural Gas Drill Pads And Adjacent Areas, Barksdale Air Force Base, Louisiana, Adam J. Miller, Hans Michael Williams, Kenneth W. Farrish, Brian P. Oswald, Daniel Unger
Faculty Presentations
Natural gas demand is projected to continue to rise. To meet this demand an increase in exploration and drilling will occur. This paper identifies some long term ecological impacts that remain following the plug and abandonment of the drill pads.
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 …
Performance Comparison Between The Use And Nonuse Of An Enteric Health Medication Program Across Five Consecutive Commercial Broiler Flocks, Joey Lynn Bray, C. S. Taylor, T. E. Cherry, J. Carey
Performance Comparison Between The Use And Nonuse Of An Enteric Health Medication Program Across Five Consecutive Commercial Broiler Flocks, Joey Lynn Bray, C. S. Taylor, T. E. Cherry, J. Carey
Faculty Publications
A study was conducted to examine broiler performance and carcass yield across 5 consecutive commercial broiler flocks after the removal of roxarsone (ROX) and growth-promoting antibiotics (GPA) from the feed. Over a 1-yr period, approximately 552,000 broilers were reared in 4 solid-walled, tunnel-ventilated houses, divided into 2 paired-house facilities, and were assigned 1 of 2 dietary treatments. The treated group received basal diets containing salinomycin, ROX, and GPA, whereas the control group received the same diets without ROX and GPA. Average BW were recorded for 200 sample birds/treatment per flock at 18, 35, and 48 d of age. Average BW, …
Effects Of Intermittent Suckling On Sow And Piglet Performance, Erin G. Brown, Lindsey B. Krebs, Chris L. Boone, Ty Cauthen
Effects Of Intermittent Suckling On Sow And Piglet Performance, Erin G. Brown, Lindsey B. Krebs, Chris L. Boone, Ty Cauthen
Faculty Publications
The objective of this study was to evaluate effects of intermittent suckling on sow and litter performance. Seventeen crossbred sows and litters were randomly assigned to treatment groups seven days prior to weaning: continuous suckling (CS) and intermittent suckling (IS; litters removed for 6 hr each from day 21 to 28). Litters were weaned at 28 days of age. Feed and water were available to litters and sows at all times. Feed intake was recorded. Body condition scores were collected on sows before farrowing and at weaning. Number of days to return-to-estrus for the sows was also recorded. Litters were …
Fin-Mutant Female Zebrafish (Danio Rerio) Exhibit Differences In Association Preferences For Male Fin Length, Jennifer M. Gumm, Jennifer L. Snekser, M. Kathryn Lovine
Fin-Mutant Female Zebrafish (Danio Rerio) Exhibit Differences In Association Preferences For Male Fin Length, Jennifer M. Gumm, Jennifer L. Snekser, M. Kathryn Lovine
Faculty Publications
Females often choose to associate with males that have exaggerated traits. In fishes, this may reflect an overall preference for larger size in a potential mate. Female zebrafish (Danio rerio) prefer males with larger bodies but not longer fins. The availability of mutant and transgenic strains of zebrafish make this a unique model system in which to study the role of phenotypic variation in social and sexual behavior. We used mutant strains of zebrafish with truncated (short fin) and exaggerated (long fin) fins to further examine female preferences for fin length in dichotomous association tests. Wild type females showed no …
A Primitive Aphidiine Wasp In Albian Amber From Spain And A Northern Hemisphere Origin For The Subfamily (Hymenoptera: Braconidae: Aphidiinae), Jaime Ortega-Blanco, Daniel J. Bennett, Xavier Delclòs, Michael S. Engel
A Primitive Aphidiine Wasp In Albian Amber From Spain And A Northern Hemisphere Origin For The Subfamily (Hymenoptera: Braconidae: Aphidiinae), Jaime Ortega-Blanco, Daniel J. Bennett, Xavier Delclòs, Michael S. Engel
Faculty Publications
A description of a new genus and species of braconid, Archephedrus stolamissus, from Early Cretaceous (Albian) amber from Moraza-Peñacerrada I (Spain) is here provided. This is the first fossil Aphidiinae described in Cretaceous amber. The fossil has some typical characters of the subfamily but possesses a unique assemblage of characters among aphidiines, such as a fairly robust abdomen, with a more pronounced articulation between the first and second, instead of the second and third, metasomal segments, as well as several wing venational traits. The distribution of this and other aphidiine fossils, as well as their putative phylogenetic placement as …
A Remarkable Tiphiiform Wasp In Mid-Cretaceous Amber From Myanmar (Hymenoptera: Tiphiidae), Michael S. Engel, Jaime Ortega-Blanco, Daniel J. Bennett
A Remarkable Tiphiiform Wasp In Mid-Cretaceous Amber From Myanmar (Hymenoptera: Tiphiidae), Michael S. Engel, Jaime Ortega-Blanco, Daniel J. Bennett
Faculty Publications
The first tiphiid wasp (Aculeata: Euaculeata: Vespoidea: Tiphiiformes) in Cretaceous amber is described and figured. Thanatotiphia nyx, new genus and species, is represented by a male entombed in mid-Cretaceous (latest Albian) amber from Myanmar. Thanatotiphia possesses remarkable apomorphies in wing venation, lacks key traits of modern subfamilies, and is thus classified in a new subfamily, Thanatotiphiinae. The fossil is further shown to be nested well within the family, indicating that major lineages of Tiphiidae diverged by the mid-Cretaceous. The new taxon is compared with modern tiphiid subfamilies and the sparse fossil history of the family briefly overviewed.
Thermoregulation Of Male Elaphe Spiloides In An Agriculturally-Fragmented Forest In Illinois, C. Drew Foster, Sarabeth Klueh, Stephen J. Mullin
Thermoregulation Of Male Elaphe Spiloides In An Agriculturally-Fragmented Forest In Illinois, C. Drew Foster, Sarabeth Klueh, Stephen J. Mullin
Faculty Publications
Anthropogenic forest fragmentation increases the amount of edge habitat. Although edges are harsh environments for many native species, ratsnakes often prefer this habitat. We examined thermoregulatory effectiveness of Central Ratsnakes (Elaphe spiloides) using forest edges preferentially to determine if edge preference is driven by increased thermoregulatory efficiencies. Six male subjects were located every 1-2 days using radio-telemetry and temperature sensitive transmitters. Subjects did not thermoregulate more efficiently in edges than in forest. Snakes were thermoconformers in both habitat types suggesting edge preference might be driven by other factors.
Demographics Of A Geographically-Isolated Population Of Threatened Salamander (Caudata: Ambystomatidae) In Central Illinois, Stephen J. Mullin, Sarabeth Klueh
Demographics Of A Geographically-Isolated Population Of Threatened Salamander (Caudata: Ambystomatidae) In Central Illinois, Stephen J. Mullin, Sarabeth Klueh
Faculty Publications
Amphibian populations that use small isolated wetlands are often small in size, susceptible to stochastic extinction processes, and have little to no contact with other populations. One can ascertain the persistence of such populations only by obtaining data that allow the prediction of future changes in population’s size, and propensity to achieve a sustainable number of individuals. The number of metamorphosing larvae leaving a pond predicts the viability of a salamander population, and thus, the number recruited into the terrestrial adult population. The Jefferson Salamander, Ambystoma jeffersonianum, is a listed threatened species in Illinois, occurring at fewer than 15 ponds …
A Survey Of Reptiles And Amphibians On Kinmen Island, Taiwan, Daniel Saenz, Heather V. Podlipny, Pei-Yu Tasi, Brent Burt, Hsiao-Wei Yuan
A Survey Of Reptiles And Amphibians On Kinmen Island, Taiwan, Daniel Saenz, Heather V. Podlipny, Pei-Yu Tasi, Brent Burt, Hsiao-Wei Yuan
Faculty Publications
Little is known about the reptiles and amphibians of Kinmen Island, Taiwan. Until recently, Kinmen had been off-limits to outsiders. It wasn’t until the mid 1990’s that civilian travel was allowed to and from the island. We surveyed 8 sites from 19 May through 18 July 2005, using 15 m drift fences with collapsible funnel traps on the ends. We documented encounters with animals outside the traps and observed 258 individuals of 7 species during our survey. The herpetofauna encountered consisted of two anuran, two lizard, and three snake species. The two anuran species made up over 97% of the …
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 …