1.  Determine hat will happen to the distribution of estuarine freshwater organisms if the building of a dam upstream reduces the flow of freshwater into the estuary?

2.  WHat impact would the construction of a highway have on the living organisms and silinity of an estuary, if it closes to the estuary's opening to the ocean?

3.  What changes in the distriubtion of organisms are likely to occur in estuaries during an El Nino year.  Think of all the possible effects the increase in rainfall had on the forces that affect the distribtuion of organisms in the estuary (e.g., river flow, water runoff from cites and fields, tides, etc.).