A 3-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of this in freshwater ecosystems?
A) increased solar radiation
B) introduction of nonnative tertiary consumer fish
C) nutrient runoff
D) accidental introduction of a prolific culture of algae
E) iron dust blowing into the lake

Question

Quizplus · Accepted Answer

Nutrient runoff, particularly from agricultural and urban areas, can lead to an excess of nutrients like nitrogen and phosphorus in freshwater ecosystems. This can cause algal blooms, which can deplete oxygen levels in the water and harm aquatic life.

A 3-Hectare Lake in the American Midwest Suddenly Has Succumbed