In aquatic systems, what role do filter feeders play?

Filter feeders play an essential role in controlling algae populations in aquatic systems. By filtering water, they consume phytoplankton, which includes algae and small organic particles. This feeding behavior helps to maintain water clarity and balance in nutrient cycling, preventing algal blooms that can arise when nutrient levels are too high.

The control of algae populations is significant for the overall health of aquatic ecosystems because excessive algae can lead to reduced oxygen levels as they decompose, cause harm to aquatic life, and block sunlight from reaching submerged plants. Thus, by keeping these populations in check, filter feeders contribute to the ecological integrity of their environments.

While nutrients recycling, consuming detritus, and providing oxygen are important functions in aquatic ecosystems, the primary and defining role of filter feeders is their ability to control algal populations through their feeding habits.