Water and Aquatic Ecosystems: Worksheet How do the properties of water affect aquatic ecosystems? Draw a diagram of the coastal and open sea marine life zones. Why are coral reefs vulnerable to damage, especially by human activities? What services do estuaries and wetlands provide? Draw a diagram of the four freshwater life zones in a lake. What is the difference between an oligotrophic and a eutrophic lake? Describe the relationship between the following terms: surface water, runoff, watershed, stream. How are hydrothermal vents formed? What is unique about the producers in these ecosystems? Why should we protect aquatic ecosystems?