What is epilimnion?

The epilimnion is the upper layer of water in a stratified lake or body of water, characterized by warmer temperatures and greater exposure to sunlight. It is typically less dense than the layers below, allowing for mixing due to wind and wave action. This layer supports a variety of aquatic life, including phytoplankton and other organisms that rely on sunlight for photosynthesis. In contrast, the layers beneath the epilimnion, such as the metalimnion and hypolimnion, have different temperature and oxygen characteristics.