A Spatial Prediction Map of Selenium Concentrations
نویسنده
چکیده
Data were provided by the United States Geological Survey on selenium concentrations collected over Benton Lake National Wildlife Refuge near Great Falls, Montana. High selenium concentrations are known to decrease reproduction rates in lake waterfowl (USFWS, 2012, p. 204). Previous work in sediment selenium data included mean concentration estimates and comparisons using several variance estimation methods. The previous work found sediment selenium concentrations to be highest in Units 1 and 2, and in areas of the lake that are flooded. Current work confirms previous findings and provides a spatial prediction map of selenium concentrations across the entire lake. Novel to the current work is incorporation of spatial correlation and Bayesian methods into predicting sediment selenium concentrations. Work is extended by implementing the minimum average posterior prediction variance criterion developed by Diggle and Lophaven (2006) to provide suggestions for a reduced location sampling plan.
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