What causes algae over abundance?
One of the reasons for an algae bloom is that the organisms are
getting the nutrients they need to overgrow. Limited nutrients keep
algae numbers in check, but if they get more they have the building
blocks to reproduce more frequently. You will often see a pond
covered with green algae when it is surrounded by grass that has been
fertilized and the fertilizer washes into the water when it rains or
the lawn is watered.
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Update: June 2012