Each of the following is an important factor in determining the productivity of freshwater lakes except

Productivity, in freshwater lakes, means converting light energy to chemical energy. This is done by the phytoplankton.

The amount of nutrients present is the most important governing factor that determines the productivity of freshwater lakes all over the world.

Temperature and moisture levels are also important parameters that determine the overall productivity of freshwater lakes.

Extreme temperatures are detrimental to the aquatic flora and fauna as well.

However, productivity is never dependent on its proximity to the marine coast. It has no relation to how close or how far it is from the coast.