1. What do we call swimming organisms?
Warm up #3
What do we call swimming organisms?
In what zone of the lake is algae the primary producer?

2. Nutrients
Rainwater runs off - dissolves and carries nutrients and sediment into lakes.
Water carries with it silt, clay, organic matter, and nutrients in solution to enrich the aquatic ecosystem
Human activities including road building, logging, mining, construction, and agriculture add to the amount of silt and organic matter

3. Nutrient status cont.
Eutrophication- nutrient enrichment of an aquatic ecosystem
Oligotrophication- nutrient reduction in an aquatic ecosystem

4. Oligotrophic System Deeper, steep sides Poorly developed littoral zone
Clear blue water
High in DO
Poor in nutrients: phosphorous, nitrogen, and calcium
Few organisms but a high diversity
Very little organic matter

5. Pics of Oligotrophic Lakes

6. Eutrophic Systems Shallow Rich in organic matter and nutrients
DO depletion in hypolimnion during summer due to decomposition
Eventually will turn into a bog or marsh
Lots of organisms, low diversity

7. Pics of eutrophic lakes