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Articles 1 - 7 of 7
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Chloroplast Development And Cytokinin And Gibberellin Effects On Ivy Geranium Under Heat Stress, Callie J. Morris
Chloroplast Development And Cytokinin And Gibberellin Effects On Ivy Geranium Under Heat Stress, Callie J. Morris
Theses and Dissertations
Developing foliar growth of ivy geraniums (Pelargonium peltatum) bleaches white after exposure to temperatures greater than 30°C. This study investigated chloroplast development in ivy geraniums under heat stress comparing a heat sensitive cultivar, Temprano™ Lavender, and a heat tolerant cultivar, Contessa™ Red. Using transmission electron microscopy and spectrophotometry, foliar bleaching under heat stress was found to be due to an absence of developed chloroplasts within the bleached new growth accompanied by lower chlorophyll content. To determine whether heat stress related foliar bleaching could be prevented, cytokinin and gibberellins were applied in combination, at different rates before, during or after a …
Using Geospatial Techniques To Assess Responses Of Black Bear Populations To Anthropogenically Modified Landscapes: Conflict & Recolonization, Jamie Elizabeth Mcfadden
Using Geospatial Techniques To Assess Responses Of Black Bear Populations To Anthropogenically Modified Landscapes: Conflict & Recolonization, Jamie Elizabeth Mcfadden
Theses and Dissertations
The convergence of three young scientific disciplines (ecology, geospatial sciences, and remote sensing) has generated unique advancements in wildlife research by connecting ecological data with remote sensing data through the application of geospatial techniques. Ecological datasets may contain spatial and sampling biases. By using geospatial techniques, datasets may be useful in revealing landscape scale (e.g., statewide) trends for wildlife populations, such as population recovery and human-wildlife interactions. Specifically, black bear populations across North America vary greatly in their degree of distribution stability. The black bear population in Michigan may be considered stable or secure, whereas the population in Missouri is …
Beta Diversity Provides Evidence Of Niche Based Assembly In Temperate Forest Understory Assemblages Of Mississippi, David Steven Mason
Beta Diversity Provides Evidence Of Niche Based Assembly In Temperate Forest Understory Assemblages Of Mississippi, David Steven Mason
Theses and Dissertations
Assembly is a process that shapes the abundance and identity of species in a community. Niche and neutral theory explain assembly processes with mechanisms driven by either species differences, or functional equivalence and stochastic dispersal. In 2017 I sampled vegetation and environmental variables at 59 sites in the Noxubee National Wildlife Refuge and Tombigbee National Forest of Mississippi to explore forest understory community assembly. I developed and assessed a framework of predictions concerning general patterns and underlying mechanism. Evidence of dispersal limitation and functional equivalence were expected under neutral theory. Local environmental characteristics, surrounding landscape variables, and fire were significant …
Characterizing Spatial And Temporal Changes And Driving Factors Of Groundwater And Surface-Water Interactions Within The Mississippi Portion Of The Mississippi Alluvial Plain, Courtney Killian
Theses and Dissertations
The Mississippi Alluvial Plain, a robust agricultural region in the South-Central United States, provides commodities across the United States and around the world. Water for irrigation, which is necessary due to irregular rainfall patterns during the growing season, is withdrawn largely from the Mississippi River Valley Alluvial aquifer, one of the most intensely used aquifers in the United States. The groundwater-dependent region has observed recent declines in groundwater and streamflow levels, raising concerns about the availability and use of fresh-water resources. Declining water levels have prompted investigation into the current understanding of groundwater and surface-water interaction. Previous research does not …
Estimating Feral Swine Abundance And Their Effects On Native Wildlife In The Mississippi Alluvial Valley, Matthew Ryan Ivey
Estimating Feral Swine Abundance And Their Effects On Native Wildlife In The Mississippi Alluvial Valley, Matthew Ryan Ivey
Theses and Dissertations
Feral swine (Sus scrofa) are an invasive species in the Mississippi Alluvial Valley (MAV). They cause millions in damage annually to agriculture, and likely negatively affect native wildlife species. Using camera traps, I monitored 36 forest patches within the MAV to assess the effects of swine invasions on native wildlife species richness. I also modified the double-observer point count technique into a new method for estimating swine abundance with camera traps. Feral swine suppressed native vertebrate richness by 26% when compared to uninvaded patches. I validated the new double-observer technique by determining if it could detect an abundance-area relationship in …
The Effects Of Common Forest Management Practices On Community Structure In A Southern Pine Forest, Donald Paul Chance
The Effects Of Common Forest Management Practices On Community Structure In A Southern Pine Forest, Donald Paul Chance
Theses and Dissertations
Planted pine (Pinus spp.) comprises nearly 10% of the total land cover in the state of Mississippi. Often, understory structure is limited in this system. Thus, managers use a variety of management practices to improve understory biomass and structure. I assessed the impacts of common forest management practices (canopy reduction, prescribed fire, and selective herbicide application) and their combined effects on aspects of community structure. More specifically, I assessed impacts of disturbance intensity on non-native plant invasions, and evaluated how microscale vegetation characteristics influenced use by white-tailed deer (Odocoileus virginianus) and wild turkey (Mealagris gallopavo). Combining canopy reductions with prescribed …
Culture Techniques And Evaluation Of Snail Consumption By Black Buffalo Ictiobus Niger, Emmet Liam Guy
Culture Techniques And Evaluation Of Snail Consumption By Black Buffalo Ictiobus Niger, Emmet Liam Guy
Theses and Dissertations
Black Buffalo Ictiobus niger are a catostomid species native to the Mississippi River Basin with declining populations. Aquaculture is a common component of recovery plans, however little information is published on catostomid culture methods. This study developed culture techniques for Black Buffalo including tank acclimation, induced spawning, larval rearing, and protein requirements. Fish needed a lengthy acclimation (> 2 months) to reduce signs of stress. After, an induced-spawning protocol was described with gonadotropin-releasing hormone analogue. Swim-up fry did not readily consume zooplankton at first feeding but began selecting for cladocerans one week after stocked in a rearing pond. The juvenile …