Now that your students have an understanding of the Hudson River's geography and the watershed that feeds it, it is important to teach them the concept of an ecosystem.
Ecosystems are defined units of study with boundaries that are often chosen for convenience. The connections between ecosystems are so strong that some ecologists argue that all life on Earth is held in a single ecosystem-the biosphere, with humans as the dominant species. However ecologists usually find it convenient to study smaller subunits and then conceptualize how the whole is put together.
Here students will learn about the Hudson River Ecosystem. The Hudson's ecosystem is connected by the streams, rainfall, runoff and seepage to the forest, atmosphere, and groundwater systems that are in its watershed.