Indicator species

The video explains how certain species can indicate water pollution levels. Dragonfly larvae are sensitive to pollutants and their presence suggests low pollution. Conversely, worms can tolerate higher pollution levels, indicating poor water conditions.

What does the presence of dragonfly larvae in a stream indicate?

How do dragonfly larvae respond to water pollutants?

What can be inferred about water quality if dragonfly larvae are present?

How do worms compare to dragonfly larvae in terms of pollution tolerance?

What do worms indicate about water conditions?