What does a limnologist study?

A limnologist focuses on the study of freshwater ecosystems, which includes lakes, rivers, streams, and wetlands. This field of study covers the physical, chemical, biological, and geological aspects of freshwater bodies, as well as the interactions between living organisms and their environment. A limnologist may investigate topics such as water quality, aquatic life, nutrient cycling, and the impacts of human activity on freshwater systems.

The other choices address different areas of scientific study: marine organisms are the domain of marine biologists, insects fall under entomology, and bird species are studied by ornithologists. Each of these fields has its own specialized focus, but limnology is specifically dedicated to understanding freshwater environments and their complex ecosystems.