An aquatic ecologist undertakes the study of water-based ecosystems, including the plants and animals that live in or near the water. As an aquatic ecologist, your duties typically involve the research of wetlands, lakes, rivers, and other freshwater habitats and the dry land that surrounds and depends on the water. You study the relationship between the two while analyzing any issues like invasive species, habitat loss, and pollution. To carry out your job responsibilities, you may examine and test water samples, monitor the ecosystem for changes, and measure the levels of particles within a water sample.