When too much stress is present in the aquatic ecosystem, there will be: loss of species, accelerated proliferation of organisms like algae bloom happening, increased chances of tumours or deformities in animals and change in chemical properties(reduction of pH in water caused by acid rain)
The may also be presence of certain organisms that indicate unsanitary conditions like the Coliform bacteria, a sign that the ecosystem may contain organisms that cause a variety of human diseases such as diarrhea, typhoid, and cholera.
Human that drinks water from the ecosystem may thus get those diseases and fall sick. Species of fish and other organisms may get extinct or endangered. The people that fish or live near the ecosystem will get affected as well. This shows the importance of a healthy aquatic ecosystem.
Many symptoms of poor ecosystem health will occur at the same time. For example, increased lake acidity may kill certain species, thereby allowing the temporary proliferation of species more tolerant to acidity.
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