Humans have fished the prawns and small fish in an estuary to near extinction. Describe the impact this could have on the bacteria and mold population as well as the heron and pelican populations.

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By fishing the prawns and small fish to near extinction, the bacterial population will increase and so will the mold, because the prawns and small fish that make use of these sources of nutrition are no longer available.

The heron and pelican population will reduce because these birds depend on the prawns and small fish for nutrition, hence, the herons and pelicans will try to look for another source of food, and the will therefore migrate to somewhere they can get food.