You are asked to estimate the nutrient content of a lake and its possible effect on net primary productivity

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You are asked to estimate the nutrient content of a lake and its possible effect on net primary productivity. What data will you collect to determine the effect?

1. Sample water from different parts of the lake and determine nutrient composition.
2. Sample the carbon content of the phytoplankton growing.
3. Take sample of lake water and artificially enrich it, then see the effect of the enrichment on phytoplankton growth compared with growth in unenriched lake water.
4. Wait for spring turnover to check for nutrients found in the lake floor.