Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Life Sciences (48)
- Biology (25)
- Medicine and Health Sciences (14)
- Social and Behavioral Sciences (14)
- Public Health (12)
-
- Forest Sciences (9)
- Physical Sciences and Mathematics (9)
- Marine Biology (8)
- Anthropology (6)
- Forest Management (4)
- Geography (4)
- Arts and Humanities (3)
- Biostatistics (3)
- Earth Sciences (3)
- Ecology and Evolutionary Biology (3)
- Entomology (3)
- Epidemiology (3)
- Law (3)
- Statistics and Probability (3)
- Art and Design (2)
- Engineering (2)
- Environmental Law (2)
- Oceanography (2)
- Oceanography and Atmospheric Sciences and Meteorology (2)
- American Literature (1)
- American Studies (1)
- Animal Sciences (1)
- Biogeochemistry (1)
- Business (1)
- Civil and Environmental Engineering (1)
- Institution
-
- Louisiana State University (109)
- University of South Carolina (30)
- Stephen F. Austin State University (13)
- The University of Southern Mississippi (13)
- Brigham Young University (9)
-
- Denison University (9)
- University of New Hampshire (6)
- Andrews University (3)
- University of Northern Iowa (3)
- San Jose State University (2)
- Florida International University College of Law (1)
- Linfield University (1)
- Macalester College (1)
- Rollins College (1)
- Santa Clara University (1)
- St. John's University School of Law (1)
- University of Missouri School of Law (1)
- University of South Dakota (1)
- Keyword
-
- Biogeography (4)
- COVID-19 (4)
- Remote sensing (4)
- Climate change (3)
- Diet (3)
-
- Disturbance (3)
- GIS (3)
- Larvae (3)
- Predation (3)
- Species interactions (3)
- Stable isotope analysis (3)
- Stable isotopes (3)
- Trophic ecology (3)
- 16S rRNA gene (2)
- Aedes aegypti (2)
- Biodiversity (2)
- Biological control (2)
- Biology (2)
- Bird (2)
- Central America (2)
- Community (2)
- Community assembly (2)
- Community modeling (2)
- Competition (2)
- DNA metabarcoding (2)
- Death (2)
- Diversity (2)
- East texas (2)
- Ecological forecasting (2)
- Ecosystem services (2)
Articles 151 - 180 of 205
Full-Text Articles in Entire DC Network
Association Between Plasma 25-Hydroxyvitamin D And Breast Cancer Risk, Katherine D. Crew, Marilie D. Gammon, Susan E. Steck, Dawn L. Hershman, Serge Cremers, Elzbieta Dworakowski, Elizabeth Shane, Mary Beth Terry, Manisha Desai, Susan L. Teitelbaum, Alfred I. Neugut, Regina M. Santella
Association Between Plasma 25-Hydroxyvitamin D And Breast Cancer Risk, Katherine D. Crew, Marilie D. Gammon, Susan E. Steck, Dawn L. Hershman, Serge Cremers, Elzbieta Dworakowski, Elizabeth Shane, Mary Beth Terry, Manisha Desai, Susan L. Teitelbaum, Alfred I. Neugut, Regina M. Santella
Faculty Publications
Vitamin D has been associated with decreased risk of several cancers. In experimental studies, vitamin D has been shown to inhibit cell proliferation and induce differentiation and apoptosis in normal and malignant breast cells. Using a population-based case-control study on Long Island, New York, we examined the association of breast cancer with plasma 25-hydroxyvitamin D (25-OHD) levels, a measure of vitamin D body stores. In-person interviews and blood specimens were obtained from 1,026 incident breast cancer cases diagnosed in 1996 to 1997 and 1,075 population-based controls. Plasma 25-OHD was measured in batched, archived specimens by Diasorin RIA. The mean (SD) …
Gst Polymorphism And Excretion Of Heterocyclic Aromatic Amine And Isothiocyanate Metabolites After Brassica Consumption, Susan E. Steck, James R. Hébert
Gst Polymorphism And Excretion Of Heterocyclic Aromatic Amine And Isothiocyanate Metabolites After Brassica Consumption, Susan E. Steck, James R. Hébert
Faculty Publications
Brassica vegetable intake has been associated with decreased risk and well-done meat intake has been associated with increased risk of cancers at multiple organ sites in epidemiologic studies. Experimental studies suggest a role of modulation of phase I and phase II metabolizing enzymes as one mechanism for these associations. Heterocyclic aromatic amines (HAAs) are carcinogens formed in meat that has been cooked to well-done and at high temperatures. Phase I metabolizing enzymes catalyze the activation of HAAs, and phase II metabolizing enzymes serve to detoxify the active carcinogens. The glutathione S-transferase (GSTs) are a family of phase II metabolizing enzymes …
From Cells To Coastlines: How Can We Use Physiology To Forecast The Impacts Of Climate Change?, Brian Helmuth
From Cells To Coastlines: How Can We Use Physiology To Forecast The Impacts Of Climate Change?, Brian Helmuth
Faculty Publications
The interdisciplinary fields of conservation physiology, macrophysiology, and mechanistic ecological forecasting have recently emerged as means of integrating detailed physiological responses to the broader questions of ecological and evolutionary responses to global climate change. Bridging the gap between large-scale records of weather and climate (as measured by remote sensing platforms, buoys and ground-based weather stations) and the physical world as experienced by organisms (niche-level measurements) requires a mechanistic understanding of how ‘environmental signals’ (parameters such as air, surface and water temperature, food availability, water flow) are translated into signals at the scale of the organism or cell (e.g. body temperature, …
The Role Of Black Barbudans In The Establishment Of Open-Range Cattle Herding In The Colonial Caribbean And South Carolina, Andrew Sluyter
The Role Of Black Barbudans In The Establishment Of Open-Range Cattle Herding In The Colonial Caribbean And South Carolina, Andrew Sluyter
Faculty Publications
Some significant problems remain in understanding the establishment of open-range cattle herding in the Caribbean and North America, especially regarding the role of blacks in that process. Research to date has identified the Greater Antilles, especially Spanish Cuba and British Jamaica, as the sole Caribbean sources of settlers who established the herding systems of, respectively, Mexico and South Carolina. Yet an open-range cattle herding system also occurred in the British Lesser Antilles, which provided many of the settlers for the South Carolina colony. Archival and field research in Antigua and Barbuda provide the basis for comprehensive reconstruction of that system’s …
Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons
Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons
Faculty Publications
© 2010 by Taylor and Francis Group, LLC. Less well studied, however, are the factors that shape elevational diversity gradients. Because many climatic factors vary systematically along elevational gradients, as they might along latitudinal gradients, elevational diversity gradients were thought to be miniature versions of latitudinal gradients (Körner, 2000). For example, Brown (1988) wrote, “Just as change of physical conditions with altitude resembles in many respects the variation with latitude, so the decreasing diversity of most organisms with increasing elevation mirrors in most respects the latitudinal gradient of species richness.” Stevens (1992) noted that, “Biologists have long recognized that elevational …
Wind Energy In Indian Country: A Study Of The Challenges And Opportunities Facing South Dakota Tribes, Patrick Garry, Candice J. Spurlin, Derek A. Nelson
Wind Energy In Indian Country: A Study Of The Challenges And Opportunities Facing South Dakota Tribes, Patrick Garry, Candice J. Spurlin, Derek A. Nelson
Faculty Publications
The development of wind power in Indian country presents a unique opportunity for Indian tribes to advance economic and social interests while adhering to traditional values and mores. Challenges exist, however, for turning wind-rich lands into viable wind energy production sites. This comment focuses on these challenges and highlights the legal issues surrounding such an undertaking as more tribes become interested in pursuing such an opportunity.
Jamaican Nightshade (Solanum Jamaicense): A Threat To Florida's Hammocks, Rodrigo Diaz, William A. Overholt, Kenneth Langeland
Jamaican Nightshade (Solanum Jamaicense): A Threat To Florida's Hammocks, Rodrigo Diaz, William A. Overholt, Kenneth Langeland
Faculty Publications
Jamaican nightshade is a prickly, perennial, invasive shrub in central and southern peninsular Florida. It was first seen in Florida in 1930 near St. Cloud, and has since been reported at several other locations in the state. Jamaican nightshade is primarily found in wooded habitats, where it can quickly become dominant in the understory, but it also occasionally grows in isolated patches in the open. Although the distribution of Jamaican nightshade does not appear to be rapidly expanding in Florida, land mangers should be made aware of the potential of this weed to establish at new sites, and initiate control …
Open And Accessible: The Relationship Between Closures And Circulation In School Library Media Centers., Gail Dickinson, E Cogdell, Karen W. Gavigan
Open And Accessible: The Relationship Between Closures And Circulation In School Library Media Centers., Gail Dickinson, E Cogdell, Karen W. Gavigan
Faculty Publications
No abstract provided.
Watershed Forest Management Information System (Wfmis), Yanli Zhang, P. K. Barten
Watershed Forest Management Information System (Wfmis), Yanli Zhang, P. K. Barten
Faculty Publications
Maintenance of a sustainable clean water supply is critical for our future. However, watershed degradation is a common phenomenon around the world that leads to poor water quality. In order to protect water resources, the Watershed Forest Management Information System (WFMIS), was developed as an extension of ArcGIS® and is described in this paper. There are three submodels to address nonpoint source pollution mitigation, road system management, and silvicultural operations, respectively. The Watershed Management Priority Indices (WMPI) is a zoning approach to prioritize critical areas for conservation and restoration management. It meets the critical need to spatially differentiate land cover …
Effects Of Eutrophication On Salt Marsh Root And Rhizome Biomass Accumulation, F A. Darby, R. Eugene Turner
Effects Of Eutrophication On Salt Marsh Root And Rhizome Biomass Accumulation, F A. Darby, R. Eugene Turner
Faculty Publications
The root:shoot ratio of grassland plants may be lower in high fertility sites than in low fertility sites as plants modify their root, rhizome and shoot morphologies (and masses) to suit prevailing nutrient availability. We conducted geographically diverse and regionally specific field sampling and measured above- and belowground plant biomasses in western Atlantic and Gulf of Mexico salt marshes to determine whether there is a similar morphological response in Spartina alterniflora, the dominant salt marsh plant. Coastal nutrient addition/enrichment, which is widespread and ongoing, may lower root and rhizome biomass, belowground production and organic accumulation in this species. Higher soil …
Ocean Urea Fertilization For Carbon Credits Poses High Ecological Risks, P.M. Glibert, R. Azanza, M. Burford, K. Furuya, E. Abal, A. Al-Azri, F. Al-Yamani, P. Andersen, D.M. Anderson, J. Beardall, G.M. Berg, L. Brand, D. Bronk, J. Brookes, J.M. Burkholder, A. Cembella, W.P. Cochlan, J.L. Collier, Y. Collos, R. Diaz, M. Doblin, T. Drennen, S. Dyhrman, Y. Fukuyo, M. Furnas, J. Galloway, E. Granéli, D.V. Ha, G. Hallegraeff, J. Harrison, P.J. Harrison, C.A. Heil, K. Heimann
Ocean Urea Fertilization For Carbon Credits Poses High Ecological Risks, P.M. Glibert, R. Azanza, M. Burford, K. Furuya, E. Abal, A. Al-Azri, F. Al-Yamani, P. Andersen, D.M. Anderson, J. Beardall, G.M. Berg, L. Brand, D. Bronk, J. Brookes, J.M. Burkholder, A. Cembella, W.P. Cochlan, J.L. Collier, Y. Collos, R. Diaz, M. Doblin, T. Drennen, S. Dyhrman, Y. Fukuyo, M. Furnas, J. Galloway, E. Granéli, D.V. Ha, G. Hallegraeff, J. Harrison, P.J. Harrison, C.A. Heil, K. Heimann
Faculty Publications
No abstract provided.
Evaluating Forest Harvesting To Reduce Its Hydrologic Impact With A Spatial Decision Support System, Yanli Zhang, P. K. Barten, Ramanathan Sugumaran
Evaluating Forest Harvesting To Reduce Its Hydrologic Impact With A Spatial Decision Support System, Yanli Zhang, P. K. Barten, Ramanathan Sugumaran
Faculty Publications
Timber harvesting changes the condition of forest ecosystems, which are a major influence on the characteristics of headwater streams. Such characteristics include the quantity and timing of base flow and storm flow, concentrations of sediment and dissolved nutrients, water temperature, and the stability of the stream channels. This paper explores previous studies dealing with the relationship between timber harvesting and its hydrologic effects, especially long term water yield increase. The watershed disturbance threshold theory is raised and investigated in detail. The development and evaluation of a spatial decision support system, the Harvest Schedule Review System (HSRS), is then described. The …
Mobile Dna Elements In Primate And Human Evolution, Jinchuan Xing, David J. Witherspoon, David A. Ray, Mark A. Batzer, Lynn B. Jorde
Mobile Dna Elements In Primate And Human Evolution, Jinchuan Xing, David J. Witherspoon, David A. Ray, Mark A. Batzer, Lynn B. Jorde
Faculty Publications
Roughly 50% of the primate genome consists of mobile, repetitive DNA sequences such as Alu and LINE1 elements. The causes and evolutionary consequences of mobile element insertion, which have received considerable attention during the past decade, are reviewed in this article. Because of their unique mutational mechanisms, these elements are highly useful for answering phylogenetic questions. We demonstrate how they have been used to help resolve a number of questions in primate phylogeny, including the human-chimpanzee- gorilla trichotomy and New World primate phylogeny. Alu and LINE1 element insertion polymorphisms have also been analyzed in human populations to test hypotheses about …
Species Invasion Shifts The Importance Of Predator Dependence, Blaine D. Griffen, David G. Delaney
Species Invasion Shifts The Importance Of Predator Dependence, Blaine D. Griffen, David G. Delaney
Faculty Publications
The strength of interference between foraging individuals can influence per capita consumption rates, with important consequences for predator and prey populations and system stability. Here we demonstrate how the replacement of a previously established invader, the predatory crab Carcinus maenas, by the recently invading predatory crab Hemigrapsus sanguineus shifts predation from a species that experiences strong predator interference (strong predator dependence) to one that experiences weak predator interference (weak predator dependence). We demonstrate using field experiments that differences in the strength of predator dependence persist for these species both when they forage on a single focal prey species only (the …
Phylogenetic Conservatism And Antiquity Of A Tropical Specialization: Army-Ant-Following In The Typical Antbirds (Thamnophilidae), Robb T. Brumfield, Jose G. Tello, Z. A. Cheviron, Matthew D. Carling, Nanette Crochet, Kenneth V. Rosenberg
Phylogenetic Conservatism And Antiquity Of A Tropical Specialization: Army-Ant-Following In The Typical Antbirds (Thamnophilidae), Robb T. Brumfield, Jose G. Tello, Z. A. Cheviron, Matthew D. Carling, Nanette Crochet, Kenneth V. Rosenberg
Faculty Publications
One of the most novel foraging strategies in Neotropical birds is army-ant-following, in which birds prey upon arthropods and small vertebrates flushed from the forest floor by swarm raids of the army-ant Eciton burchellii. This specialization is most developed in the typical antbirds (Thamnophilidae) which are divisible into three specialization categories: (1) those that forage at swarms opportunistically as army-ants move through their territories (occasional followers), (2) those that follow swarms beyond their territories but also forage independently of swarms (regular followers), and (3) those that appear incapable of foraging independently of swarms (obligate followers). Although army-ant-following is one of …
Differential Resource Allocation In Deer Mice Exposed To Sin Nombre Virus, Eric Wilson, Erin M. Lehmer, Christine A. Clay, Stephen St. Jeor, Denise M. Dearing
Differential Resource Allocation In Deer Mice Exposed To Sin Nombre Virus, Eric Wilson, Erin M. Lehmer, Christine A. Clay, Stephen St. Jeor, Denise M. Dearing
Faculty Publications
The resource allocation hypothesis predicts that reproductive activity suppresses immunocompetence; however, this has never been tested in an endemic disease system with free-ranging mammals. We tested the resource allocation hypothesis in wild deer mice (Peromyscus maniculatus) with natural exposure to Sin Nombre Virus (SNV). Immunocompetence was estimated from the extent of swelling elicited after deer mice were injected with phytohemagglutinin (PHA); swelling is positively correlated with immunocompetence. After livetrapping deer mice, we determined their reproductive state and SNV infection status. Males were more likely to be seropositive for SNV than females (37% vs. 25%) and exhibited 10% less swelling after …
Modeling And Prediction Of Marine Microbial Populations In The Genomic Era, Raleigh R. Hood, Edward A. Laws, Michael J. Follows, David A. Siegel
Modeling And Prediction Of Marine Microbial Populations In The Genomic Era, Raleigh R. Hood, Edward A. Laws, Michael J. Follows, David A. Siegel
Faculty Publications
No abstract provided.
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Faculty Publications
Microarray experiments typically involve washing steps that remove hybridized nonspecific targets with the purpose of improving the signal- to- noise ratio. The quality of washing ultimately affects downstream analysis of the microarray and interpretation. The paucity of fundamental studies directed towards understanding the dissociation of mixed targets from microarrays makes the development of meaningful washing/ dissociation protocols difficult. To fill the void, we examined activation energies and preexponential coefficients of 47 perfect match ( PM) and double- mismatch ( MM) duplex pairs to discover that there was no statistical difference between the kinetics of the PM and MM duplexes. Based …
Comparative Bacterial Diversity In Recent Hawaiian Volcanic Deposits Of Different Ages, Vicente Gomez-Alvarez, Gary M. King, Klaus Nüsslein
Comparative Bacterial Diversity In Recent Hawaiian Volcanic Deposits Of Different Ages, Vicente Gomez-Alvarez, Gary M. King, Klaus Nüsslein
Faculty Publications
Volcanic activity creates new landforms that can change dramatically over time as a consequence of biotic succession. Nonetheless, volcanic deposits present severe constraints for microbial colonization and activity. We have characterized bacterial diversity on four recent deposits at Kilauea volcano, Hawaii (KVD). Much of the diversity was either closely related to uncultured organisms or distinct from any reported 16S rRNA gene sequences. Diversity indices suggested that diversity was highest in a moderately vegetated 210-year-old ash deposit (1790-KVD), and lowest for a 79-year-old lava flow (1921-KVD). Diversity for a 41-year-old tephra deposit (1959-KVD) and a 300-year-old rainforest (1700-KVD) reached intermediate values. …
Th Politics Of Hate: Ultranationalist And Fundamentalist Tactics And Goals, Joan Davison
Th Politics Of Hate: Ultranationalist And Fundamentalist Tactics And Goals, Joan Davison
Faculty Publications
Ultranationalist and religious fundamentalist movements frequently use hate to mobilize people. These groups possess a sophisticated understanding of the importance of appealing to the emotions. Leaders often employ xenophobic language intended to inspire fear and justify a defensive reaction. The movements also rely heavily upon symbols, myths, and public events to simplify and communicate the "truths" of their ideologies. The leaders convey messages with tremendous affective appeal. Yet, measures exist to counter and contain the politics of hate. The development of civil society, group rights, a free media, and integrated institutions can contribute to a durable solution in cases of …
Art, Ecology And Art Education: Locating Art Education In A Critical Place-Based Pedagogy, Mark Graham
Art, Ecology And Art Education: Locating Art Education In A Critical Place-Based Pedagogy, Mark Graham
Faculty Publications
In contemporary life and education, the local is marginalized in favor of large-scale economies of consumption that are indifferent to ecological concerns. The consequences of neglecting local human and natural communities include a degraded habitat, loss of wilderness, alienation, rootlessness, and lack of connection to communities. Critical place-based pedagogy provides a robust framework for the theory and practice of art education that is concerned with ecological issues. This article locates art education within a critical pedagogy of place as a prelude to describing contemporary art and art education that is engaged with ecological Issues.
Contemporary Art, Science, Ecology, And A Critical Pedagogy Of Place, Mark Graham
Contemporary Art, Science, Ecology, And A Critical Pedagogy Of Place, Mark Graham
Faculty Publications
In contemporary life and education, the local is marginalized in favor of large-scale economies of consumption that are indifferent to ecological concerns. The consequences of neglecting local human and natural communities include a degraded habitat, loss of wilderness, alienation, rootlessness, and lack of connection to communities. Place-based education responds to this indifference to local ecological concerns by grounding student learning in the experiences of their own lives, communities, and regions. Critical place-based pedagogy broadens the scope of place-based learning by incorporating critical theory into the curriculum of the local. This article describes a critical pedagogy of place as a prelude …
Observations On The Diets Of An Anuran And Eight Lizard Taxa From Sonora, Chihuahua, And Coahuila, Mexico, With Some Notes On Clutch Sizes, Geoffrey R. Smith, J. A. Lemos-Espinal, Christopher B. Dibble, Megan E. Ogle, Joshua J. Schulte, Andrew J. Terlecky, Allison Boyd
Observations On The Diets Of An Anuran And Eight Lizard Taxa From Sonora, Chihuahua, And Coahuila, Mexico, With Some Notes On Clutch Sizes, Geoffrey R. Smith, J. A. Lemos-Espinal, Christopher B. Dibble, Megan E. Ogle, Joshua J. Schulte, Andrew J. Terlecky, Allison Boyd
Faculty Publications
No abstract provided.
Biological Status Of Leatherside Chub: A Framework For Conservation Of Western Freshwater Fishes, Mark C. Belk, Jerald B. Johnson
Biological Status Of Leatherside Chub: A Framework For Conservation Of Western Freshwater Fishes, Mark C. Belk, Jerald B. Johnson
Faculty Publications
Outside of anadromous salmonids and a few endangered species, biology of native freshwater fishes of western North America is poorly known. What do we need to know to effectively manage native species and avoid decline and extinction? A recent analysis of the role of science in the Pacific salmon controversy outlines a clear framework for biological evaluation and management of native species. This framework has three components: (1) determine status of populations based on genetic and ecological variation, (2) identify and quantify threats to populations, and (3) determine actions to alleviate threats and promote conservation of populations. We use our …
Liana Habitat Associations And Community Structure In A Bornean Lowland Tropical Forest, Saara J. Dewalt, Kalan Ickes, Reuben Nilus, Kyle E. Harms, David F.R.P. Burslem
Liana Habitat Associations And Community Structure In A Bornean Lowland Tropical Forest, Saara J. Dewalt, Kalan Ickes, Reuben Nilus, Kyle E. Harms, David F.R.P. Burslem
Faculty Publications
Lianas (woody vines) contribute substantially to the diversity and structure of most tropical forests, yet little is known about the importance of habitat specialization in maintaining tropical liana diversity and the causes of variation among forests in liana abundance and species composition. We examined habitat associations, species diversity, species composition, and community structure of lianas at Sepilok Forest Reserve, Sabah, Malaysia in northeastern Borneo among three soil types that give rise to three distinct forest types of lowland tropical rain forest: alluvial, sandstone hill, and kerangas (heath) forest. Alluvial soils are more nutrient rich and have higher soil moisture than …
Species-Habitat Associations In A Sri Lankan Dipterocarp Forest, C. V.S. Gunatilleke, I. A.U.N. Gunatilleke, S. Esufali, K. E. Harms, P. M.S. Ashton, D. F.R.P. Burslem, P. S. Ashton
Species-Habitat Associations In A Sri Lankan Dipterocarp Forest, C. V.S. Gunatilleke, I. A.U.N. Gunatilleke, S. Esufali, K. E. Harms, P. M.S. Ashton, D. F.R.P. Burslem, P. S. Ashton
Faculty Publications
Forest structure and species distribution patterns were examined among eight topographically defined habitats for the 205 species with stems ≥ 1 cm dbh inhabiting a 25-ha plot in the Sinharaja rain forest, Sri Lanka. The habitats were steep spurs, less-steep spurs, steep gullies and less-steep gullies, all at either lower or upper elevations. Mean stem density was significantly greater on the upper spurs than in the lower, less-steep gullies. Stem density was also higher on spurs than in gullies within each elevation category and in each upper-elevation habitat than in its corresponding lower-elevation habitat. Basal area varied less among habitats, …
Coprophagy In A Cave-Adapted Salamander; The Importance Of Bat Guano Examined Through Nutritional And Stable Isotope Analyses, Danté B. Fenolio, G. O. Graening, Bret A. Collier, Jim F. Stout
Coprophagy In A Cave-Adapted Salamander; The Importance Of Bat Guano Examined Through Nutritional And Stable Isotope Analyses, Danté B. Fenolio, G. O. Graening, Bret A. Collier, Jim F. Stout
Faculty Publications
During a two year population ecology study in a cave environment, 15 Eurycea (=Typhlotriton) spelaea were observed ingesting bat guano. Furthermore, E. spelaea capture numbers increased significantly during the time that grey bats (Myotis grisescens) deposited fresh guano. We investigated the hypothesis that this behaviour was not incidental to the capture of invertebrate prey, but a diet switch to an energy-rich detritus in an oligotrophic environment. Stable isotope assays determined that guano may be assimilated into salamander muscle tissue, and nutritional analyses revealed that guano is a comparable food source to potential invertebrate prey items. This is the first report …
Spatial Autocorrelation And Pseudoreplication In Fire Ecology, Amanda L. Bataineh, Brian P. Oswald, Mohammad M. Bataineh, Daniel Unger, I-Kuai Hung, Daniel Scognamillo
Spatial Autocorrelation And Pseudoreplication In Fire Ecology, Amanda L. Bataineh, Brian P. Oswald, Mohammad M. Bataineh, Daniel Unger, I-Kuai Hung, Daniel Scognamillo
Faculty Publications
Fire ecologists face many challenges regarding the statistical analyses of their studies. Hurlbert (1984) brought the problem of pseudoreplication to the scientific community’s attention in the mid 1980’s. Now, there is a new issue in the form of spatial autocorrelation. Spatial autocorrelation, if present, violates the traditional statistical assumption of observational independence. What, if anything, can the fire ecology community do about this new problem? An understanding of spatial autocorrelation, and knowledge of available methods used to reduce the effect of spatial autocorrelation and pseudoreplication will greatly assist fire ecology researchers.
Comparative Susceptibility Of Sweetpotato Weevil (Coleoptera: Brentidae) To Selected Insecticides, Tara P. Smith, Abner M. Hammond
Comparative Susceptibility Of Sweetpotato Weevil (Coleoptera: Brentidae) To Selected Insecticides, Tara P. Smith, Abner M. Hammond
Faculty Publications
The response of sweetpotato weevil, Cylas formicarius (F.) (Coleoptera: Brentidae), to insecticides used for its control was tested in laboratory bioassays. A glass vial bioassay technique was used to determine the susceptibility of two cohorts of sweetpotato weevil to selected insecticides. Vials were treated with methyl parathion, bifenthrin, cyfluthrin, carbaryl, and phosmet. Sweetpotato weevils demonstrated a mortality response to increasing concentrations of all insecticides tested, and our results indicated decreases in susceptibility of the Louisiana cohort of sweetpotato weevil compared with the Texas cohort for all insecticides tested. Methyl parathion was the most toxic chemical tested for both cohorts, followed …
Diversity And Structure Of Bacterial Chemolithotrophic Communities In Pine Forest And Agroecosystem Soils, J. Tolli, G. M. King
Diversity And Structure Of Bacterial Chemolithotrophic Communities In Pine Forest And Agroecosystem Soils, J. Tolli, G. M. King
Faculty Publications
Obligate lithotrophs (e.g., ammonia oxidizers) and facultative lithotrophs (e.g., CO and hydrogen oxidizers) collectively comprise a phylogenetically diverse functional group that contributes significantly to carbon and nitrogen cycles in soils and plays important roles in trace gas dynamics (e.g., carbon monoxide and nitrous and nitric oxides) that affect tropospheric chemistry and radiative forcing. In spite of their diverse physiologies, facultative and obligate lithotrophs typically possess the Calvin-Benson-Bassham cycle enzyme, ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisCO). In an effort designed to understand the structure of lithotrophic communities in soil, genomic DNA extracts from surface (0 to 2 cm) and subsurface (5 to 7 cm) …