Why Ecosystems Depend on Water?

Water has lots of oxygen (from the atmosphere as rain) 

  • It is essential for photosynthesis in aquatic plants like algae (reactant in process of photosynthesis)
  • Nutrients in water, like nitrates are essential for growth and sources of food (rotting plants)

If water sources are polluted these life support systems will disrupt ecological processes further down in the food chain.