To measure primary production of algae in a stream, you place two sealed chambers in the stream, each enclosing the sediments as well as the water above them. One chamber is covered with black tape (blocking all light) while the other is transparent to light. You measure dissolved oxygen (DO) before and after a 24-hour incubation. DO in the light chamber increased by 1.5 g/m^2 while DO in the dark chamber decreased by 2.0 g/m What is the estimated ecosystem respiration (Re) for the stream? What is the stream’s estimated NEP (net ecosystem production)? Based on these data, what is the stream’s estimated gross primary production (GPP)?