Nitrates/Nitrites:  total nitrates measures the total amounts of nitrates and nitrites in the water column
	-nitrogen enters lake through decomposition of dead organisms -all forms of nitrogen can be converted to nitrates and nitrites, the form available to plants
	sources: runoff, fertilizers, manure,
	-levels higher than 0.2 ppm  can cause algal blooms, excess plant activity
	-although TMP was slightly higher than surrounding Maine lakes, in sep still below the critical level, but could still promote algal growth in the presence of sufficient phosphorus
	Tom will now talk to you about the most important nutrient for plant growth, and a very important indicator of lake health-Phosphorus.