『Abstract
　Cultural eutrophication of lakes caused by excess phosphorus (P) loading from agricultural areas is a persistent and serious environmental problem. We quantified P flows in a watershed-lake ecosystem using a simple mathematical model that coupled in-lake and upland processes to assess and compare the long-term impacts of various management strategies. Our model compares abatement by in-lake strategies (such as increasing the flux of P from algae to consumers and alum application) with riparian management to decrease P flow and with balancing P budgets at the watershed scale. All of these strategies are effective to some extent. However, only reducing the amount of fertilizer P imported to the watershed will decrease the total P in the system at steady state. Soil P - a large reservoir with slow turnover rate - governs long-term flux to the lake and must be decreased in size to maintain long-term control of eutrophication.

Keywords: eutrophication; restoration; ecosystem model; phosphorus; lake management; non-point source pollution.』

Introduction
Methods
　Model structure
　Parameter estimation
　Parameter estimates
　　Standing stock P
　　Inputs
　　Outputs
　　Flows
　Scenarios
　　Increasing the flux to consumers
　　Alum treatment
　　Riparian zone manipulation
　　Fertilizer imports
Results
　P movement within the Lake Mendota watershed
　Model sensitivity
　　Inputs and exports
　　Internal flows
　Scenarios
　　No management change
　　Increased flux to consumers
　　Alum treatment
　　Riparian zones
　　Fertilizer import
Discussion
Acknowledgments
References