In this example, we use real ecological research data to demonstrate, using loop analysis, an analysis of an aquatic system which encounters an invasive species. This example is provided by Michael Chi-Chun Liu, a Fisheries and Wildlife graduate student from Oregon State University. We will also be using the prediction matrix from loop analysis to suggest several management scenarios to predict the reduction of the invasive species.

The New Zealand mudsnail, potamopyrgus antipodarum was first discovered in the mid-Snake River, Idaho in the 1980's. It is a parthenogenic livebearer with high reproductive potential. Because of this, it is now a rapidly spreading problem throughout the western USA and has become established in rivers in 10 western states and three national parks. Because of its reproductive potential, the mud snail has reached densities of 100,000/m2 in some suitable habitats. This rapidly growing invasion has created problematic situations for fisheries, and aquatic ecosystems in the western USA, who are also concerned about the potential harmful effects that could potentially generate on the native species of the various areas.

 Preliminary Study: 

 Five Models: 

 PowerPlay:  video, download Model 1

 Loop Analysis: