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The Bioaccumulation Of Cyanotoxins In Aquatic Food Webs, Amanda Lee Murby Mcquaid
The Bioaccumulation Of Cyanotoxins In Aquatic Food Webs, Amanda Lee Murby Mcquaid
Doctoral Dissertations
Cyanobacteria are naturally occurring photosynthetic bacteria, ubiquitous in nature. Increases in temperature and nutrients have supported the proliferation of cyanobacterial growth globally, especially in freshwater systems. Many taxa can produce biotoxins referred to as “cyanotoxins”. While toxic cyanobacteria are a growing public health concern, little is known about the accumulation of cyanotoxins in lake food webs. This research investigates the seasonal occurrence and the potential role of toxic cyanobacteria in two lakes of contrasting water qualities and food web structures. Objectives of this study were to test the bioaccumulation of microcystins (MCs) and beta-methyl-alanine-amino acid (BMAA) in zooplankton. I further …
Going Beneath The Surface: The Ecology Of Metalimnetic Cyanobacteria Layers In Three New Hampshire Lakes, Sabina Perkins
Going Beneath The Surface: The Ecology Of Metalimnetic Cyanobacteria Layers In Three New Hampshire Lakes, Sabina Perkins
Master's Theses and Capstones
Cyanobacteria blooms take different forms: surface scums, subsurface epilimnetic blooms, benthic mats, and in some lakes, metalimnetic layers. There is limited field research on the seasonal behavior of metalimnetic layers and the contribution of layer-produced cyanotoxins to the overall toxin profile of New Hampshire lakes. Three lakes in New Hampshire were monitored monthly pre-summer stratification through post-fall mixis in 2018, tracking the formation and persistence of deep-water cyanobacteria layers and the physical/chemical/light environments where they were found. Cyanobacteria abundance and dominance were quantified through cell counts using an Imaging Flow Cytobot (IFCB) and with phycocyanin fluorescence estimates. Persistent, nearly monospecific …
Environmental Regulation Of Cyanobacteria Aerosols From Low Productivity Lakes, Katharine Lorena Langley
Environmental Regulation Of Cyanobacteria Aerosols From Low Productivity Lakes, Katharine Lorena Langley
Master's Theses and Capstones
Cyanobacteria produce a range of toxins harmful to both humans and wildlife. Microcystins (MCs) are common and potent cyanotoxins that inhibit protein phosphatases in the liver. Chronic exposures can result in tumor promotion and cancer. Toxicity primarily follows ingestion of MCs, however inhalation may be an important secondary and compounding route of exposure to cyanotoxins. The LD50 of intratracheally applied MC-LR is 50x lower than the oral LD50. While MCs are well documented in water, little is known about cyanobacteria and cyanotoxins in aerosols and the factors that regulate the movement of cells and toxins into the air. To begin …