Phosphorus Uptake Mechanisms in Missouri Streams

Excess nutrients affect many natural ecosystems and lead to imperilment of ecosystem integrity. Although nutrient uptake in streams has received growing attention in recent years, we still have little quantitative information on the specific characteristics of streams that affect uptake rates. My research included combining experimental (using artificial streams) and observational (measuring uptake in whole streams) approaches to understand specific controls on phosphorus uptake in streams. Phosphorus was chosen because it is one of the primary nutrients that enter water systems through agricultural runoff. This research attempted to quantify the response of nutrient uptake from the addition of limestone and to varying amounts of algal biomass. Experimental channels were set up simulating natural streams where biological and geological characteristics were manipulated. Results from the experimental channels allowed predictions of uptake rates for whole streams given their biological and geological characteristics. This project will help guide the management of streams to protect downstream systems from eutrophication.