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Originally Posted by tis
Exactly as the pictures show. It's amazing isn't it? So if the cows fertilized the fields why didn't it run into the lake and cause cyanobacteria? Or did it?
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It most likely did run into the lake and increase nutrients, promoting stuff like cyanobacteria. But it did not cause cyanobacteria blooms like we have today because the total volume of nutrient flow into the lake was far, far less. Also, as John pointed out, nutrients can build up over years.