Ecosystem indicators are measurable features that help scientists assess the health and stability of an ecosystem. These indicators can include species diversity, water quality, and the presence of certain plants or animals. By monitoring these factors, researchers can determine if an ecosystem is thriving or facing challenges. Common ecosystem indicators include biodiversity, which reflects the variety of life in an area, and trophic levels, which show how energy flows through food chains. Changes in these indicators can signal environmental issues, such as pollution or habitat loss, allowing for timely conservation efforts.