Eutrophication Dbq

The agriculture industries have affected the marine life due to eutrophication. Eutrophication occurs when human activity water because of the chemicals, nitrogen and phosphorus which run off into the water. Eutrophication results in algal bloom. An algal bloom forms when lots of nitrogen and phosphorus are set inside a body of water which results in an excess amount of algae in lakes, oceans, or streams. The waters can not take in a lot of algae because in can affect the habitat of the animals. It can also affect the population of the sea animals.

As seen in Document A, the farmers who use fertilization for their crops caused pollution in their fields. The additional amounts of the fertilizer end up running into water which crates dead zones. They are called dead zones because of the lack of oxygen in the area. Dead zones can be created by pollution such as factory smoke and waste materials. In this case, The pollution is coming from the extra amount of fertilizer that the farmers are using.

The agricultural industries have affected the amounts of algae in their ecosystems.

For Example, Documents B shows that the amount of algae is increasing through steps. The oligotrophic stage how the beginning of the marine life's habitat before fertilizer was used. The mesotrophic stage shows that the fertilizer is being used which is helping the soil and bacteria began to increase and algal blooms start to form. It is affecting the algae amount a little. The eutrophic stage shows the over use of the fertilizer. The algae a The amount of algae has reach its maximum amount in the water. This is because so much fertilizer has been used that it continues to run into the bodies of water. The run off of fertilizers and caused many of the sea creatures to

die.
As seen in Document C, there are many living things in the marine ecosystem like crabs, dolphins, and other fish. When the algal blooms start to increase in amounts, the animals start to decrease in amounts. The population of the animals start to decrease because the areas that they live in, dead zones, lack the resource of oxygen. The algae, of an algal bloom, start to covered the water which prohibits the oxygen to enter through the water. The sea creatures need oxygen to live, but can not breathe in the algal blooms are covering up the water.
The fertilizer that the farmers use are hurting the ecosystems. Many species are dying because of the nitrogen and phosphorus in the water which cause algal blooms. The algal blooms will decrease the amounts of animals and healthy waters if the fertilizers are continued to be a source that is over used. Decreasing the amount of fertilizer that are used can stabilize and increase the population of marine life and clean waters. There is no ecosystem with a healthy habitat and a plentiful amount of animals.