BIO HW
Storyboard Text
- Eutrophication is a process that can happen in a water body, like a river or a lake, when too many nutrients are added to the system. The process begins when fertilisers, which are rich in nutrients, are washed into a river or lake system.
- Nutrients are food for algae, so when the fertiliser enters the water, the algae grow and reproduce quickly, forming a thick green bloom at the surface of the water. This blocks out the sunlight coming in and will cause plants that need to photsynthesize to die. The algae will also die eventually when they run out of nutrients.
- Bacteria live off of the dead plants and algae, and that causes them to release more nutrients, continuing the cycle. The bacteria, with such a large supply of food reproduce into large numbers and eat up all of the oxygen available.
- The water, which is now without oxygen (aka anoxic) will kill all non bacterial life forms due to the lack of oxygen. This is a reason why we need to be careful with fertiliser use as it can lead to the collapse of entire ecosystems.
- The water, which is now without oxygen (aka anoxic) will kill all non bacterial life forms due to the lack of oxygen. This is a reason why we need to be careful with fertiliser use as it can lead to the collapse of entire ecosystems.
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