What is the primary use of a Secchi disk in aquatic studies?

The primary use of a Secchi disk in aquatic studies is to assess water clarity. This disk, which is typically made of a white, round plate, is lowered into the water until it is no longer visible to the observer. The depth at which the disk disappears provides a quantitative measure of water transparency. This measurement is crucial because it can indicate the presence of suspended particles, algae growth, and overall water quality, which are important for the health of aquatic ecosystems. By understanding water clarity, scientists and environmental managers can make informed decisions regarding aquatic habitats and potential pollution sources. This method is widely used in limnology and oceanography to monitor aquatic environments.