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Impacts Of Environmental Stressors On Native South Dakota Amphibian Physiology And Survival, Danielle Jean Galvin
Impacts Of Environmental Stressors On Native South Dakota Amphibian Physiology And Survival, Danielle Jean Galvin
Dissertations and Theses
Amphibian populations around the world are declining, with some of the most likely drivers behind these declines including emerging infectious diseases and environmental contaminants. To address major gaps in the current literature, I sought to evaluate the effect of two major environmental stressors on various aspects of amphibian physiology: emerging infectious diseases and environmental contaminants. Emerging infectious diseases of amphibians include fungal, viral, and parasitic pathogens which have expanded in host range, either geographically or in competent host species. Environmental contaminants include chemicals which may be naturally occurring in the environment, or which may be introduced to the environment, often …
Detection Of Neonicotinoids In Northern Leopard Frog (Rana Pipiens) Brains, Peyton G. Keller
Detection Of Neonicotinoids In Northern Leopard Frog (Rana Pipiens) Brains, Peyton G. Keller
Honors Thesis
Neonicotinoids are widespread and commonly used to fight agricultural pests. Unfortunately, these neurotoxic insecticides commonly reach nearby wetlands due to tile drainage systems and agricultural runoff. Non-target organisms, such as amphibians, use wetlands as habitat and are likely exposed to elevated neonicotinoid levels. We collected Northern leopard frogs and water samples from control and tile wetlands to compare imidacloprid brain concentrations and subsequent changes in brain morphology. Additionally, a lab-based experiment was conducted to further analyze the ability of imidacloprid and its metabolite, imidacloprid-olefin, to cross the blood-brain barrier. Tile wetlands had higher aquatic imidacloprid concentrations. Subsequently, amphibians collected from …