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Articles 1 - 5 of 5
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Characterizing Carbon In Agricultural Landscapes, Lauren Ann Weller
Characterizing Carbon In Agricultural Landscapes, Lauren Ann Weller
Electronic Theses and Dissertations
Soil organic matter (SOM) is an important pillar of soil fertility and ecosystem health. However, uncertainty exists both in the evaluation of agricultural conservation measures for specific local contexts and the sensitivity of the analytical tools used. Therefore, the objective of this thesis was to characterize organic matter from agricultural soils, focusing specifically on addressing field- and analytically based uncertainties associated with the ultraviolet-Visible (UV-Vis) and fluorescence spectroscopy of water-extractable organic matter (WEOM), and using the clay-dominated soils of Essex County as a case study. Here I explored optical spectroscopy properties across a gradient of agricultural practices and restoration to …
Mosquito Species Distribution Models: Limitations And Best Practices, Justin Barker
Mosquito Species Distribution Models: Limitations And Best Practices, Justin Barker
Electronic Theses and Dissertations
Understanding species distribution is fundamental to ecology and biogeography, with important implications for species management. This is especially true for species of public health concern—such as mosquitoes—which can impart both economic and health impacts. Species distribution models (SDMs) are powerful tools to accomplish this goal. However, obtaining reliable conclusions, those which are accurate and applicable for policy development, from SDMs is not straightforward owing to the many required considerations such as objective with respect to limitations of the available data. The goal of this thesis was to determine recommended methods to address known and unknown mosquito SDM limitations. First, I …
Understanding Freshwater Ecosystems And Human Health Implications In Recreational Water Through Microbial Characterization, Source Tracking, And Sediment-Microbe Dynamics, Danielle Gleason
Electronic Theses and Dissertations
Contamination of natural aquatic ecosystems is a serious global concern as populations increase and the environment is impacted by climate change. Nonpoint source (NPS) contamination of allochthonous materials, such as sediments, nutrients, and microorganisms, is commonly introduced to a body of water through runoff and wash-off which cumulates over a large area, and is subsequently transported to surface waters (e.g., rivers, streams, lakes) and shorelines. The principal form of microbial contamination of water resources is often from fecal pollution derived from humans, domesticated animals, or wildlife, and contains a variety of human pathogens. There are also numerous factors (with limited …
Detection Of Endangered Fish In Dianchi Lake, Kunming, China, Using Edna And Traditional Fishing, Kai Zhang
Detection Of Endangered Fish In Dianchi Lake, Kunming, China, Using Edna And Traditional Fishing, Kai Zhang
Electronic Theses and Dissertations
Dianchi Lake, Yunnan, China is a eutrophic plateau lake. Many native fish species in the lake are currently endangered or extinct due to a variety of stressors. Community surveys are important for ecological management and protection, though efforts are hampered by low abundance of some species. The goal of this thesis was to understand the community structure and distribution of fish in Dianchi Lake and to detect Sinocyclocheilus grahami, a critically endangered species endemic to the lake, using both traditional netting methods and environmental DNA. Using traditional netting and trapping, I found that the fish community of …
Patterns And Behaviours Of Barrier Breaching In Lacustrine Environments: A Case Study From The Point Pelee Foreland, Jenny Gharib
Patterns And Behaviours Of Barrier Breaching In Lacustrine Environments: A Case Study From The Point Pelee Foreland, Jenny Gharib
Electronic Theses and Dissertations
The Great Lakes are non-tidal, but experience significant water level fluctuations at hourly, seasonal, and decadal scales. In response to elevated water levels, barrier beach-ridges, including those located on the eastern shore of the Point Pelee foreland, experience accelerated erosion, overwash, and breaching leading to the removal or burial of vegetation, and damage to infrastructure and vulnerable habitat. Historical aerial imagery between 1931–2022 and annual average lake levels between 1920–2022 were examined to characterize barrier retreat and breach initiation, expansion, and closure. The timing and rate of transgression and progradation, overwash, and breaching are dependent on decadal-scale variations in water …