Assessing The Impacts Of Time-To-Detection Distribution Assumptions On Detection Probability Estimation, 2019 Iowa State University
Assessing The Impacts Of Time-To-Detection Distribution Assumptions On Detection Probability Estimation, Adam Martin-Schwarze, Jarad Niemi, Philip Dixon
Abundance estimates from animal point-count surveys require accurate estimates of detection probabilities. The standard model for estimating detection from removal-sampled point-count surveys assumes that organisms at a survey site are detected at a constant rate; however, this assumption can often lead to biased estimates. We consider a class of N-mixture models that allows for detection heterogeneity over time through a flexibly defined time-to-detection distribution (TTDD) and allows for fixed and random effects for both abundance and detection. Our model is thus a combination of survival time-to-event analysis with unknown-N, unknown-p abundance estimation. We specifically explore two-parameter families of TTDDs, e ...
Natural Selection Footprints Among African Chicken Breeds And Village Ecotypes, 2019 Iowa State University
Natural Selection Footprints Among African Chicken Breeds And Village Ecotypes, Ahmed R. Elbeltagy, Francesca Bertolini, Damarius S. Fleming, Angelica Van Goor, Chirs M. Ashwell, Carl J. Schmidt, Donald R. Kugonza, Susan J. Lamont, Max F. Rothschild
Animal Science Publications
Natural selection is likely a major factor in shaping genomic variation of the African indigenous rural chicken, driving the development of genetic footprints. Selection footprints are expected to be associated with adaptation to locally prevailing environmental stressors, which may include diverse factors as high altitude, disease resistance, poor nutrition, oxidative and heat stresses. To determine the existence of a selection footprint, 268 birds were randomly sampled from three indigenous ecotypes from East Africa (Rwanda and Uganda) and North Africa (Baladi), and two registered Egyptian breeds (Dandarawi and Fayoumi). Samples were genotyped using the chicken Affymetrix 600K Axiom® Array. A total ...
Cryptic Viral Infections In Benthic Biofilm Communities, 2019 College of William and Mary
Cryptic Viral Infections In Benthic Biofilm Communities, Alexandra Payne
Undergraduate Honors Theses
As the most ubiquitous biological entities on earth, viruses have important impacts on aquatic microbial ecology and have been studied at length in the global ocean. However, the role of bacteriophage in lotic ecosystems, particularly in benthic biofilms, have been largely under studied. Streams and rivers play crucial roles in global carbon cycling, with over 2 x 1015 g C turned over each year, and benthic biofilms appear to be hotspots of microbial activities like organic carbon transformations. Given this importance of lotic ecosystems and the known impacts of viruses in other aquatic systems, investigating the ecology of viruses ...
Implementing The North American Bat Monitoring Program In Nebraska: An Assessment Of Nebraska Bats With An Emphasis On Citizen Science, 2019 University of Nebraska-Lincoln
Implementing The North American Bat Monitoring Program In Nebraska: An Assessment Of Nebraska Bats With An Emphasis On Citizen Science, Baxter Seguin
Dissertations & Theses in Natural Resources
Over the past decade bat species in North America have been under immense stress due to anthropogenic activities throughout the continent along with severe declines from foreign invaders. Though many specific anthropogenic related activities such as deforestation, land-use alteration, and hibernacula disturbance/modification were the primary culprits of negative impacts on bat species in the past, they pale in comparison to the threats bats face today. White nose syndrome a disease caused by the fungus Pseudogymnoascus destructans and wind energy development have caused declines and disruptions to the bat populations of North America at an unprecedented rate.
Due to the ...
Characterization Of Microtubule Organizing Centers In The Genus Protostelium, Including Evolutionary Implications, 2019 University of Arkansas, Fayetteville
Characterization Of Microtubule Organizing Centers In The Genus Protostelium, Including Evolutionary Implications, Ethan Taylor Ozment
Theses and Dissertations
Microtubule organizing centers (MTOCs) are cellular regions of microtubule nucleation. The best known MTOCs are those associated with the centrosome, but several non-centrosomal MTOCs are known in eukaryotes, especially in land plants. MTOCs are poorly characterized across the breadth of amoebozoan diversity, but are well-known in certain amoebozoan lineages, including the genus of protosteloid slime molds Protostelium. The structure of the MTOC is known for two non-ciliated species, P. nocturnum and P. mycophaga, as well as P. aurantium, which can reversibly become ciliated under appropriate conditions. P. nocturnum and P. mycophaga have acentriolar centrosomal MTOCs while P. aurantium has a ...
Conservation Of Threatened Canada-Usa Trans-Border Grizzly Bears Linked To Comprehensive Conflict Reduction, 2019 Birchdale Ecological Ltd.
Conservation Of Threatened Canada-Usa Trans-Border Grizzly Bears Linked To Comprehensive Conflict Reduction, Michael F. Proctor, Wayne F. Kasworm, Kimberly M. Annis, A. Grant Machutchon, Justin E. Teisberg, Thomas G. Radandt, Chris Servheen
Erratum to "Conservation of Threatened Canada-USA Trans-border Grizzly Bears Linked to Comprehensive Conflict Reduction". https://doi.org/10.26077/yjy6-0m57
A Biotelemetric Study Comparing Diving Behavior And Brumation Sites Of Translocated And Resident Northern Map Turtles (Graptemys Geographica) And Their Response To Replica Model Turtles On Artificial Basking/Nesting Platforms In The Upper Niagara River, 2019 State University of New York College at Buffalo - Buffalo State College
A Biotelemetric Study Comparing Diving Behavior And Brumation Sites Of Translocated And Resident Northern Map Turtles (Graptemys Geographica) And Their Response To Replica Model Turtles On Artificial Basking/Nesting Platforms In The Upper Niagara River, Jesse M. Karcher
Anthropogenic shoreline development leading to a lack of access to terrestrial nesting sites is one of the causes for northern map turtle decline in the upper Niagara River. Translocation of adult map turtles and the development of floating basking/nesting platforms were proposed as possible remedies for this population decline. Biotelemetry along with aerial and underwater drones were used to assess habitat preferences between resident and translocated turtles. It was expected that the platforms would be used for basking and nesting and that a platform located in a natural location would be more successful than one in a developed area ...
Observations And Applications Of Husbandry Methodologies On A Backyard Poultry Farm In Dangriga, Belize, 2019 University of Arkansas, Fayetteville
Observations And Applications Of Husbandry Methodologies On A Backyard Poultry Farm In Dangriga, Belize, Bailey Carpenter
Animal Science Undergraduate Honors Theses
This study explores the husbandry methodologies on a backyard poultry farm in Dangriga, Belize, with the purpose of producing a set of guidelines for backyard poultry growers that have limited resources in similar regions. The majority of data collection occurred through survey questions approved by the IRB, necropsies approved by IACUC, and general observations. There has been a steady increase in poultry production in developing regions due to its positive effects on income and relative nutrition. However, due to a lack of accessible communication and education regarding effective and safe poultry production, these operators typically see poor productivity and/or ...
Ecological And Economic Implications Of Increased Storm Frequency And Severity For Boreal Lakes, 2019 University of Maine
Ecological And Economic Implications Of Increased Storm Frequency And Severity For Boreal Lakes, Kathryn Warner
Electronic Theses and Dissertations
In boreal regions, increased precipitation events have been linked to increased concentrations of dissolved organic carbon (DOC), however less is known about the extent and implications of these events on lakes. We assessed the effects of precipitation events on six drinking water lakes in Maine, USA to better understand how DOC concentration and quality change in response to precipitation events. Our results revealed three types of responses: (1) an initial spike in DOC concentrations and quality metrics; (2) a sustained increase in DOC concentrations and quality metrics and; (3) no change during all sampling periods. Lake residence time was a ...
Phylogenomics And Geometric Morphometrics Define Species Flocks Of Snowtrout (Teleostei: Schizothorax) In The Central Himalayas, 2019 University of Arkansas, Fayetteville
Phylogenomics And Geometric Morphometrics Define Species Flocks Of Snowtrout (Teleostei: Schizothorax) In The Central Himalayas, Binod Regmi
Theses and Dissertations
Schizothorax (Snowtrout) is a genus of medium-sized minnows (Cypriniformes) inhabiting glacier-fed streams, rivers, and lakes in the Himalayas. There are more than 30 species of Schizothorax across the region. The speciation and diversity of the Snowtrout in the vast hinterlands of the Himalayan Region has not been fully explored. Three species in Lake Rara, Western Nepal are considered a species flock, comprising endemic ecotypes that are morphologically differentiated and reproductively isolated.
My dissertation research examined the diversity of Schizothorax in the Central Himalayan region and evolutionary relationships among species distributed in the Tibet, Central and Southeast Asia. Chapter I describes ...
American White Pelicans, 2019 National Wildlife Research Center, Starkville, Mississippi
American White Pelicans, Tommy King
Wildlife Damage Management Technical Series
American white pelicans (Pelecanus erythrorhynchos, Figure 1) threaten aquaculture producers by direct predation and the spread of disease. They are also considered competition and a nuisance by some sports fishermen. Pelicans can also damage pond levees and crops, such as rice, by trampling the vegetation and depositing guano. A combination of wildlife damage management techniques is often necessary to reduce pelican damage to these resources. Aquaculture Prior to the winter of 1992, American white pelican depredations at catfish facilities in the Delta regions of Arkansas and Mississippi were limited, and birds were easily dispersed from the area. Since 1992, however ...
Cognitive Models Of Defense Behaviors In Hosts Of Brood Parasites, 2019 The Graduate Center, City University of New York
Cognitive Models Of Defense Behaviors In Hosts Of Brood Parasites, Thomas J. Manna
All Dissertations, Theses, and Capstone Projects
Social parasites exploit the behavioral repertoire of their hosts for their own benefit, thereby reducing host reproductive success. Whether and how hosts respond to prevent, reduce, or eliminate the costs of parasitism requires the characterization of host cognitive algorithms in response to parasites. In this dissertation, I review the suite of the defense behaviors and decision rules of hosts targeted by avian and insect brood parasites, and present new experimental data on the detection of parasitism through the visual system of focal host species. In Chapter 1, I review extensive data already accumulated to isolate the cognitive mechanisms used by ...
Intraspecific Variation In Plant-Plant Interactions And Belowground Zone Of Influence Of Big Sagebrush (Artemisia Tridentata), Andrii Zaiats
Boise State University Theses and Dissertations
Post-fire restoration of degraded sagebrush ecosystems over large areas of the Great Basin is challenging, in part due to unpredictable outcomes. Low rates of restoration success are attributed to increasing frequencies of wildfires, biological invasions, and climate variability. Quantifying restoration outcomes by accounting for sources of biotic and abiotic variability will improve restoration as a predictive science. One source of biotic variability is neighbor interactions, which can regulate demographic parameters of coexisting species and are an important determinant of community structure, ecosystem functions, and population dynamics. Our objective was to quantify how intraspecific variability in big sagebrush, Artemisia tridentata, including ...
Amphibian And Reptile Community Responses To Forest And Riparian Disturbance, 2019 University of Arkansas, Fayetteville
Amphibian And Reptile Community Responses To Forest And Riparian Disturbance, Jacquelyn Christine Guzy
Theses and Dissertations
Riparian zones are transitional, semi-terrestrial areas regularly influenced by freshwater. These areas serve as dispersal corridors for many animal and plant species and ultimately function as important reservoirs of biodiversity in altered landscapes. While much of the riparian habitat in the United States has been affected by anthropogenic activities, management actions may mitigate potentially negative influences of these activities. For example, Streamside Management Zones (i.e., riparian buffers; SMZs) are commonly implemented within managed forests to protect water quality, but may also provide habitat for riparian-associated wildlife. Yet, little research has rigorously addressed the value of SMZs for wildlife, particularly ...
Cool And Warm Season Climate Signals In Tree Rings From North America, 2019 University of Arkansas, Fayetteville
Cool And Warm Season Climate Signals In Tree Rings From North America, Max Carl Arne Torbenson
Theses and Dissertations
Earlywood (EW) and latewood (LW) ring-width chronologies have become an increasingly important proxy in paleoclimate reconstructions. These subannual variables can provide estimates of past hydroclimate variability for seasonal windows that total ring-widths cannot resolve. The strength of the relationship between EW and LW series may influence what type of paleoclimate information is embedded within the tree-ring series. High correlations (> 0.70) between EW and LW are recorded for much of the continent but the magnitude of correlation varies greatly across space and species boundaries. Using four LW chronologies from shortleaf pine, the North American conifer species displaying the lowest EW-LW ...
Impacts Of Cattle Grazing As A Tool To Control Phragmites Australis In Wetlands On Nitrogen, Phosphorus, And Carbon, Brittany L. Duncan
All Graduate Theses and Dissertations
Phragmites australis is a plant that is causing problems in wetlands by outcompeting native plants that provide food and shelter for millions of migratory birds. Currently, managers try to control Phragmites australis by spraying herbicide, burning, and mowing, but these methods are costly, time consuming, and have low levels of success. Adding grazing as a tool to control Phragmites australis provides a cheap and low labor alternative. However, there are many concerns regarding if grazing will cause nutrient loading in our wetlands that will decrease water quality and alter beneficial functions of wetlands.
To better understand the effects of grazing ...
The Spatial Ecology Of Predator-Prey Interactions: A Case Study Of Yellowstone Elk, Wolves, And Cougars, 2019 Utah State University
The Spatial Ecology Of Predator-Prey Interactions: A Case Study Of Yellowstone Elk, Wolves, And Cougars, Michel T. Kohl
All Graduate Theses and Dissertations
The loss of large apex predators, and their subsequent reintroduction, has been identified as a substantial driver on the structure and function of ecological communities through behavioral mediated trophic cascades (BMTCs). The reintroduction of wolves (Canis lupus) to Yellowstone National Park (YNP) has served as foundational case study of BMTCs. In our system, it has been suggested that wolves have established a ‘landscape of fear’ in which the primary prey, elk (Cervus elaphus), now avoid risky places, which ultimately led to the recovery of the vegetation community. Although this case is frequently cited as a well-understood example of a landscape ...
Fire - Herbivory Interactions In An East African Savanna: Effects On Acacia Drepanolobium Trees, 2019 Utah State University
Fire - Herbivory Interactions In An East African Savanna: Effects On Acacia Drepanolobium Trees, Eric M. Lamalfa
All Graduate Theses and Dissertations
Globally, changes in plant community structure have occurred in ecosystems where humans have altered natural disturbance regimes. Many plants have adaptive life histories and morphological traits that have coevolved with fire and herbivory, which allows them to thrive despite repeated tissue losses. Therefore, altering the type, frequency, or severity of disturbance affects individual plant growth and competition among species. When these changes benefit or disadvantage different plant functional groups (i.e., grasses, shrubs, trees) it alters ecosystem structure and function. Understanding and predicting these vegetation changes, is critical for conservation and management of biodiversity, wildlife habitat, livestock forage, and water ...
Monitoring Desert Ungulates Via Fecal Dna-Based Capture Recapture, 2019 Utah State University
Monitoring Desert Ungulates Via Fecal Dna-Based Capture Recapture, Stephen S. Pfeiler
All Graduate Theses and Dissertations
Estimates of population abundance and survival are critical for effective wildlife management. Obtaining estimates of these kind using traditional wildlife monitoring techniques (i.e. ground and aerial surveys) has proven to be difficult, especially for species that are wide ranging and exist in small, patchily distributed populations.
My objective was to implement fecal DNA-based capture-recapture surveys to estimate abundance and survival of two different ungulate populations that inhabit the deserts of southeastern California. I also compared fecal DNA-based capture-recapture techniques to traditional methods by evaluating the costs and precision associated with both methods. Using artificial water sources as focal sampling ...
Understanding Wetlands And Irrigation In The Little Snake River Basin, Wyoming, 2019 Utah State University
Understanding Wetlands And Irrigation In The Little Snake River Basin, Wyoming, Lindsey Washkoviak
All Graduate Plan B and other Reports
The Little Snake River Basin (LSRB) is a managed basin in South-central Wyoming located within the Colorado River watershed facing severe water shortages. There is increased pressure on water resource managers and agricultural producers to adopt water efficiency practices that could negatively affect wetland resources. However, studies have begun to quantify the importance of irrigation for recharging groundwater, maintaining late season instream flows, and maintaining and creating wetlands that provide wildlife habitat and ecosystem services.
In the LSRB there are 11,636 acres of wetlands; 56% of which overlap with irrigation. Conversion to more efficient irrigation could reduce water availability ...