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Full-Text Articles in Physical Sciences and Mathematics
Hydrology-Biology Response Relationships In The Ozark Highlands, Dustin Thomas Lynch
Hydrology-Biology Response Relationships In The Ozark Highlands, Dustin Thomas Lynch
Graduate Theses and Dissertations
I examined flow-ecology relationships among stream communities in the Ozark Highlands, USA. I sampled fish, crayfish, and benthic macroinvertebrates during two consecutive summers, including a drought year (2012) and a flood year (2013). Biological response variables related to community structure were assessed via two different statistical methods: an Information Theoretic approach relating response variables to a priori selected predictor variables incorporating hydrology, habitat, geomorphology, and water quality, and canonical ordination using forward selection to relate these same response variables to a large assortment of hydrologic metrics. In addition to assessing metrics related to predicted natural flow, flow alteration at gaged …
Bioaccumulation And Concentration Of Mercury In Rivers And Streams Of The Hudson Bay Lowland, Ashley Warnock
Bioaccumulation And Concentration Of Mercury In Rivers And Streams Of The Hudson Bay Lowland, Ashley Warnock
Electronic Thesis and Dissertation Repository
Methylmercury (MeHg) is a neurotoxin that biomagnifies in northern aquatic food webs to high enough concentrations to cause concern for human consumption. The Hudson Bay Lowland of Canada is projected to experience climate and land-use impact in the immediate future, and these environmental stressors may affect the exposure to and subsequent bioaccumulation of MeHg in subarctic fish populations. The focus of this research is to evaluate the spatial variability in total and MeHg in water, sediment, and biota within and across a range of subarctic streams and river reaches of the Hudson Bay Lowland. This data was then used to …
Evaluation Of Endocrine Disrupting Chemicals In The Florida Coastal Pelagic Fish Complex Following The Deepwater Horizon Oil Spill Event, Rachel Hickey
HCNSO Student Theses and Dissertations
Following the BP Deepwater Horizon oil spill event, there was a critical need to assess the effects of the oil and dispersant chemicals on the coastal pelagic fish complex in the Gulf of Mexico and the Florida Straits. The objective of this study was to determine if spilled crude oil and dispersant chemicals have posed an ecological risk to the coastal pelagic fish complex through the detection of vitellogenesis. Crude oil containing polycyclic aromatic hydrocarbons (PAHs), dispersant chemicals and other estrogen-mimicking compounds are suspected to induce vitellogenin production in male and immature female fish, normally only produced by sexually mature …