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Articles 61 - 67 of 67
Full-Text Articles in Ecology and Evolutionary Biology
Relationships Between Isolating Land Use And Amphibian Populations In Sub-Boreal Peatlands Of The Midwestern United States, Jeana Rose Albers
Relationships Between Isolating Land Use And Amphibian Populations In Sub-Boreal Peatlands Of The Midwestern United States, Jeana Rose Albers
All Graduate Theses, Dissertations, and Other Capstone Projects
Successful conservation efforts of amphibians depend on the knowledge of habitat preferences because the biggest threat to amphibian populations is considered to be habitat loss. Sub-boreal peatlands in the Midwest may be a refuge for amphibian populations, but little is known about the flora and fauna of these peatlands. My study examined amphibian species richness and species diversity in 17 sub-boreal peatlands in Minnesota and Wisconsin in 2011 and 2012. I assessed the relationship between land use of lands adjacent to peatlands and use of those peatlands by amphibian populations at three spatial scales by examining landscapes surrounding peatlands in …
Effects Of Extreme Hydrologic Events On Trout Populations And Fish Communities In A Catskill Mountain River, Scott Daniel George
Effects Of Extreme Hydrologic Events On Trout Populations And Fish Communities In A Catskill Mountain River, Scott Daniel George
Legacy Theses & Dissertations (2009 - 2024)
Extreme hydrologic events are becoming more common with changing climatic conditions. Although the impacts of winter and spring floods on lotic ecosystems have been well studied, the effects of summer floods on fish assemblages in mountain streams are less well known. This study took advantage of an extreme precipitation event during the course of an ongoing monitoring program, which allowed the opportunity to quantify the effects of a severe late summer flood on fish communities in a montane watershed. We also evaluated the effect of the flood on the density and age structure of two ecologically important populations of sport …
The Effects Of Herbicide On The Endangered Herb Baptisia Arachnifera And Preliminary Nutrient Survey Of Leaf Tissue And Soil, Ruth Ann C. Steinbrecher
The Effects Of Herbicide On The Endangered Herb Baptisia Arachnifera And Preliminary Nutrient Survey Of Leaf Tissue And Soil, Ruth Ann C. Steinbrecher
Electronic Theses and Dissertations
Baptisia arachnifera (Hairy Rattleweed) is an endangered herbaceous legume that only occurs in Wayne and Brantley Counties of Georgia, United States. Many of the remaining populations exist in areas now managed for timber. This study investigated the effects of Imazapyr, an herbicide commonly used in timber management, on health and vitality of B. arachnifera under both field and greenhouse conditions. This study also analyzed leaf and soil samples from six populations of B. arachnifera to determine the nutrient content of the leaves. A recensus of a B. arachnifera population was also conducted in a site without commercial timber management. In …
Approaches To Improving Detection Of Invasive Fish Species In Western Lake Erie Through Analysis Of Monitoring Efficiencies And Metrics Of Community Distribution, Joshua Alan Southern
Approaches To Improving Detection Of Invasive Fish Species In Western Lake Erie Through Analysis Of Monitoring Efficiencies And Metrics Of Community Distribution, Joshua Alan Southern
Wayne State University Theses
Efficient monitoring programs are essential for the early detection of invasive species. The Ohio Department of Natural Resources (ODNR) monitoring program encompassing 21 years of fish survey data from western Lake Erie was evaluated using Chao biodiversity analysis to determine the efficiency and precision of collection strategies of trawl and gillnet sampling, at detecting rare or non-native species. Overall, ODNR sampling annually accounted for ~80% of extant fish species, leaving gaps in coverage where rare and invasive species may be overlooked and proliferate.Obtaining 90% efficiency would require an estimated doubling of previous sampling effort. Computer simulations calculating different proportions of …
Epistasis In Predator-Prey Relationships, Iuliia Inozemtseva
Epistasis In Predator-Prey Relationships, Iuliia Inozemtseva
Electronic Theses and Dissertations
Epistasis is the interaction between two or more genes to control a single phenotype. We model epistasis of the prey in a two-locus two-allele problem in a basic predator- prey relationship. The resulting model allows us to examine both population sizes as well as genotypic and phenotypic frequencies. In the context of several numerical examples, we show that if epistasis results in an undesirable or desirable phenotype in the prey by making the particular genotype more or less susceptible to the predator or dangerous to the predator, elimination of undesirable phenotypes and then genotypes occurs.
Water Column Ammonium Concentration And Salinity Influence Nitrogen Uptake And Growth Of Spartina Alterniflora, Rachel Mactavish
Water Column Ammonium Concentration And Salinity Influence Nitrogen Uptake And Growth Of Spartina Alterniflora, Rachel Mactavish
Electronic Theses and Dissertations
Salt marsh macrophytes, such as Spartina alterniflora, play a critical role in uptake and transformation of inorganic nitrogen before it reaches coastal waters, thereby reducing the potential for eutrophication. Although nitrogen availability typically limits S. alterniflora growth, it may be possible to exceed the nitrogen uptake capacity of S. alterniflora. Increasing either nitrogen concentrations or salinity are key factors regulating S. alterniflora nitrogen uptake. Investigating the effects of nutrients and salinity on S. alterniflora is important given that increases in inorganic nitrogen supply to surface waters from agriculture and urbanization occur simultaneously with freshwater withdrawals that reduce flow and increase …
Tactical Escape Behavior And Performance Of A Small Sceloporine Lizard In Two High Risk Habitats, Seth Parker
Tactical Escape Behavior And Performance Of A Small Sceloporine Lizard In Two High Risk Habitats, Seth Parker
Electronic Theses and Dissertations
The negotiation of uneven and complex terrain has implications for many small terrestrial vertebrates. Variation in the running surface due to obstacles like woody debris or vegetation can alter escape paths and running performance. Additionally, these microhabitat features can influence behavioral tactics in complex environments. The ability to negotiate physical barriers in dense environments likely influences survivorship through important ecological tasks, such as finding mates, foraging, and evading predators. The Florida scrub lizard (Sceloporus woodi) is a small, rare species endemic to two distinct and structurally complex environments in Florida, i.e. sand-pine scrub and longleaf pine-wiregrass sand-hills. The …