How could a thick layer of algae on the surface of a pound affect the producer that live on or near the bottom of the pond?

A thick layer of algae on the surface of a pond can block sunlight from reaching the producers, such as aquatic plants and phytoplankton, that live on or near the bottom. This reduced light availability can inhibit photosynthesis, leading to decreased oxygen production and limiting the growth and survival of these producers. Additionally, the decomposition of excess algae can lead to lower oxygen levels in the water, further stressing bottom-dwelling producers and disrupting the entire aquatic ecosystem.