1. And the activity of those phytoplankton and autotroph can even change the direction of DINS fluxes.

2. As nouns the difference between Auxotroph and autotroph is that Auxotroph is any microorganism that has lost the ability to synthesize an organic compound required for its growth, usually as a result of mutation while autotroph is (biology) any organism that can synthesize its food from inorganic substances, using heat or light as a source of energy.