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Articles 1 - 30 of 57
Full-Text Articles in Physical Sciences and Mathematics
Summer 2024 Research Proposal: Swanberg Sanctuary Prairie Plant Community Characterization And Management Testing, Jillian Becksfort
Summer 2024 Research Proposal: Swanberg Sanctuary Prairie Plant Community Characterization And Management Testing, Jillian Becksfort
Scholar Week 2016 - present
Prairie management is an involved process that is focused on maintaining existing grassland plant and animal communities. Invasive species and the spread of woody shrubs and trees presents a real threat to the existing prairie. Woody stems can affect resources such as water access and nutrient availability, which may cause changes to the prairie’s unique plant communities. Management techniques like burning and mowing are commonly used to prevent woody stems from causing changes to the prairie ecosystem. The Sanctuary was restored to natural prairie habitat in 2008 and a list of planted species is available. However, no plant surveys have …
Evolution In Segregating Genotype Mixtures Of Subterranean Clover, P.G. H. Nichols, P S. Cocks
Evolution In Segregating Genotype Mixtures Of Subterranean Clover, P.G. H. Nichols, P S. Cocks
IGC Proceedings (1997-2023)
A complex segregating mixture of subterranean clover (Trifolium subterraneum L.), was sown in 1978 at Nabawa and Mt Barker, two contrasting sites in Western Australia. Seed harvested from both sites from 1980-1994 was grown out at Shenton Park in 1995, along with seed of the original mixture. Populations diverged markedly for mean days to first flowering (DFF) within three seasons. No further trends in mean DFF occurred in plants derived from the next 14 years, although standard deviation declined significantly in plants from Mt Barker. Between season differences in mean DFF were correlated with estimated growing season length at …
Role Of The Grassland Society Of Bosnia And Herzegovina In Grassland Agriculture, S. Alibegovic-Gbic, M. Bezdrob
Role Of The Grassland Society Of Bosnia And Herzegovina In Grassland Agriculture, S. Alibegovic-Gbic, M. Bezdrob
IGC Proceedings (1997-2023)
The biggest part of Bosnia and Herzegovina is covered with hilly and mountainous terrain, which, from the agricultural perspective, determines the manner of soil usage. Of all agricultural areas in Bosnia and Herzegovina, 55.49% are covered by grassland with that figure increasing to 79.14% in mountainous regions. Therefore, grassland agriculture and its cousin livestock production are the most significant part of the Bosnian economy. In the current situation natural grasslands are largely neglected and give a low yield of forage of low quality. Many areas are completely abandoned and have been gradually overgrown with weeds and bushes. Yet a special …
Exploration Of Differential Equation Models For Phage-Bacteria Population Dynamics, John Lawrence D. Palacios, Rebecca Segal
Exploration Of Differential Equation Models For Phage-Bacteria Population Dynamics, John Lawrence D. Palacios, Rebecca Segal
Biology and Medicine Through Mathematics Conference
No abstract provided.
Identifiability Analysis Applied To Rhizbium-Legume Symbiosis Model, Meghan Peltier
Identifiability Analysis Applied To Rhizbium-Legume Symbiosis Model, Meghan Peltier
Biology and Medicine Through Mathematics Conference
No abstract provided.
Mathematics Of Population-Genetics Model For Assessing The Impacts Of Insecticide Resistance And Temperature On Population Abundance Of Malaria Mosquitoes, Jemal Mohammed-Awel
Mathematics Of Population-Genetics Model For Assessing The Impacts Of Insecticide Resistance And Temperature On Population Abundance Of Malaria Mosquitoes, Jemal Mohammed-Awel
Biology and Medicine Through Mathematics Conference
No abstract provided.
Exploring The Dynamics Of Bacterial Populations In The Gut Microbiota, Shaikh Obaidullah
Exploring The Dynamics Of Bacterial Populations In The Gut Microbiota, Shaikh Obaidullah
Biology and Medicine Through Mathematics Conference
No abstract provided.
Simulation And Latin Hypercube Sampling Of Mixed-Time Models In A Consumer-Resource Relationship, Boluwatife E. Awoyemi, Amanda N. Laubmeier, Richard L. Rebarber
Simulation And Latin Hypercube Sampling Of Mixed-Time Models In A Consumer-Resource Relationship, Boluwatife E. Awoyemi, Amanda N. Laubmeier, Richard L. Rebarber
Biology and Medicine Through Mathematics Conference
No abstract provided.
Modeling Functional Redundancy In Microbial Community, Sandra Annie Tsiorintsoa
Modeling Functional Redundancy In Microbial Community, Sandra Annie Tsiorintsoa
Biology and Medicine Through Mathematics Conference
No abstract provided.
Optimal Control And The Trojan Y Chromosome Eradication Strategy, Christopher Turner
Optimal Control And The Trojan Y Chromosome Eradication Strategy, Christopher Turner
Biology and Medicine Through Mathematics Conference
No abstract provided.
Gene Drives And The Consequences Of Over-Suppression, Cole Butler
Gene Drives And The Consequences Of Over-Suppression, Cole Butler
Biology and Medicine Through Mathematics Conference
No abstract provided.
Bioeconomic Analysis In A Predator-Prey System With Harvesting: A Case Study In The Chesapeake Bay Fisheries, Iordanka Panayotova, Maila Hallare
Bioeconomic Analysis In A Predator-Prey System With Harvesting: A Case Study In The Chesapeake Bay Fisheries, Iordanka Panayotova, Maila Hallare
Biology and Medicine Through Mathematics Conference
No abstract provided.
Spatial Patterning Of Predator-Prey Distributions Arising From Prey Defense, Evan C. Haskell, Jonathan Bell
Spatial Patterning Of Predator-Prey Distributions Arising From Prey Defense, Evan C. Haskell, Jonathan Bell
Biology and Medicine Through Mathematics Conference
No abstract provided.
Effects Of Temperature Fluctuation On Interactions Between Generalist Insect Predators, Amanda N. Laubmeier, Nusrat Tabassum, Brigitte Tenhumberg
Effects Of Temperature Fluctuation On Interactions Between Generalist Insect Predators, Amanda N. Laubmeier, Nusrat Tabassum, Brigitte Tenhumberg
Biology and Medicine Through Mathematics Conference
No abstract provided.
Early Signs Of Regime Shift And Population Outbreak In A Two-Timescale Predator-Prey Model., Susmita Sadhu Dr.
Early Signs Of Regime Shift And Population Outbreak In A Two-Timescale Predator-Prey Model., Susmita Sadhu Dr.
Biology and Medicine Through Mathematics Conference
No abstract provided.
The Interplay Between Costly Reproduction And Unpredictable Environments Shapes The Stability Of Cooperative Breeding, Glenn Steven Young
The Interplay Between Costly Reproduction And Unpredictable Environments Shapes The Stability Of Cooperative Breeding, Glenn Steven Young
Biology and Medicine Through Mathematics Conference
No abstract provided.
Comparison Of Heavy Metals In Spinach Grown On The Roof Ground Location At Portland State University, Tyler A. Robin
Comparison Of Heavy Metals In Spinach Grown On The Roof Ground Location At Portland State University, Tyler A. Robin
Student Research Symposium
As a result of urbanization, fresh, healthy food can be expensive and easily contaminated but space for local farming is limited. Roofs can be underutilized in densely populated cities and can offer a space for local fresh farming. The purpose of this study is to continue a previous study done in 2021, to find if growing leafy vegetables on the roof can limit heavy metal exposure from air pollutants. This study compares spinach grown on the roof in 2021, 2019 and spinach bought from stores around the Portland State University campus and the heavy metals found in these greens. The …
Interacting Effects Of Disease And Weather Variability On Rangeland Biodiversity Associated With Black-Tailed Prairie Dog (Cynomys Ludovicianus) Colonies, Courtney J. Duchardt, J. D. Hennig, D. Pellatz
Interacting Effects Of Disease And Weather Variability On Rangeland Biodiversity Associated With Black-Tailed Prairie Dog (Cynomys Ludovicianus) Colonies, Courtney J. Duchardt, J. D. Hennig, D. Pellatz
IGC Proceedings (1997-2023)
Rangeland ecosystems worldwide are experiencing novel pressures during the Anthropocene, including land conversion, disease dynamics, non-native species, and climate change. These issues can be compounded in rangelands occupied by burrowing rodents. Often considered keystone species important for maintaining rangeland biodiversity, these species often experience widespread control efforts because of their potential to reduce forage for livestock. We examined the effects of climatic variation and disease on bird communities associated with a North American burrowing rodent, the black-tailed prairie dog (Cynomys ludovicianus). Following an outbreak of sylvatic plague (Yersinia pestis) in the prairie dog population, we observed …
Himalayan Rangelands Ecology And Animal Production Influenced By Changing Social And Economic Culture In Northern Areas Of Pakistan, Syed Hassan Raza
Himalayan Rangelands Ecology And Animal Production Influenced By Changing Social And Economic Culture In Northern Areas Of Pakistan, Syed Hassan Raza
IGC Proceedings (1997-2023)
No abstract provided.
The Effect Of Changing Substrate On Arctic Aquatic Invertebrates Abundance, Tom Dolman
The Effect Of Changing Substrate On Arctic Aquatic Invertebrates Abundance, Tom Dolman
Michael D. Wilson Symposium
Climate change is directly affecting tundra ecosystems in northern regions, and warming temperatures have caused discontinuous permafrost and thawing sediments across the region. This project investigates how increasing erosion and the foraging patterns of migratory snow geese may degrade habitat for aquatic invertebrates in the upper Mast River, located in Wapusk National Park, Manitoba, Canada. In the past two decades, many of the important species of aquatic invertebrates have shown declines. Declining invertebrate populations are predicted to affect aquatic ecosystems and decrease the resources available to shorebirds and waterfowl, which breed and migrate through this area.
Procedures For Estimation Of The Livestock Ecological Footprint In Us Drylands, Robert A. Washington‐Allen, John E. Mitchell
Procedures For Estimation Of The Livestock Ecological Footprint In Us Drylands, Robert A. Washington‐Allen, John E. Mitchell
IGC Proceedings (1997-2023)
No abstract provided.
Sustainability And Optimization Of Rangeland Uses: Issues Of Perspective And Scale, T. L. Thurow
Sustainability And Optimization Of Rangeland Uses: Issues Of Perspective And Scale, T. L. Thurow
IGC Proceedings (1997-2023)
No abstract provided.
Density-Dependent Development Impacts The Success Of Wolbachia-Based Mosquito Control Programs, Alyssa Petroski, Lauren M. Childs, Michael Andrew Robert
Density-Dependent Development Impacts The Success Of Wolbachia-Based Mosquito Control Programs, Alyssa Petroski, Lauren M. Childs, Michael Andrew Robert
Biology and Medicine Through Mathematics Conference
No abstract provided.
Attraction-Repulsion Taxis Mechanisms In A Predator-Prey Model, Evan C. Haskell
Attraction-Repulsion Taxis Mechanisms In A Predator-Prey Model, Evan C. Haskell
Biology and Medicine Through Mathematics Conference
No abstract provided.
The Role Of Increased Gonotrophic Cycles In The Establishment Of Wolbachia In Anopheles Populations, Lauren M. Childs, Ryan Hughes, Julie Blackwood
The Role Of Increased Gonotrophic Cycles In The Establishment Of Wolbachia In Anopheles Populations, Lauren M. Childs, Ryan Hughes, Julie Blackwood
Biology and Medicine Through Mathematics Conference
No abstract provided.
A Model-Based Investigation Of The Role Of Density Dependence In Juvenile Mosquito Development And Survival, Melody Walker Ms, Lauren M. Childs, Michael A. Robert
A Model-Based Investigation Of The Role Of Density Dependence In Juvenile Mosquito Development And Survival, Melody Walker Ms, Lauren M. Childs, Michael A. Robert
Biology and Medicine Through Mathematics Conference
No abstract provided.
Modeling Vaccination Strategies To Control White-Nose Syndrome In Little Brown Bat Colonies, Eva Cornwell, David Elzinga, Shelby R. Stowe, Alex Capaldi
Modeling Vaccination Strategies To Control White-Nose Syndrome In Little Brown Bat Colonies, Eva Cornwell, David Elzinga, Shelby R. Stowe, Alex Capaldi
Biology and Medicine Through Mathematics Conference
No abstract provided.
Mathematical Modeling Of Gliding Motility And Its Regulation In Myxococcus Xanthus, Yirui Chen
Mathematical Modeling Of Gliding Motility And Its Regulation In Myxococcus Xanthus, Yirui Chen
Biology and Medicine Through Mathematics Conference
No abstract provided.
Eco-Evolutionary Dynamics Of Microbial Communities, Lihong Zhao
Eco-Evolutionary Dynamics Of Microbial Communities, Lihong Zhao
Biology and Medicine Through Mathematics Conference
No abstract provided.
The Role Of Variation In Mate Choice And Wolbachia Infection On Aedes Aegypti Population Dynamics, Bernardo Ameneyro
The Role Of Variation In Mate Choice And Wolbachia Infection On Aedes Aegypti Population Dynamics, Bernardo Ameneyro
Biology and Medicine Through Mathematics Conference
No abstract provided.