Effects on Animals
The effects of acid rain on animals are seen in the aquatic environment and wildlife. Acid rain flows into streams and lakes through the soil.
It carries aluminum from soil clay particles and introduces it to the water.
Some animals can tolerate acidic water and moderate amounts of aluminum to some extent.
The young species under the water are more sensitive than adults.
Fish eggs do not hatch at pH 5. If the pH level becomes lower than that, a certain number of fish will die.
That is the reason why you will find some lakes that do not have fish.
Even if some fish and underwater species can tolerate pH 4, their food will not. As a result, those species will die, too, anyway.
For example, a frog can endure pH 4, but frogs eat mayflies that do not survive at pH below 5.5.
This means frogs have little chance to survive.
The plants and animals are in an interlinked ecosystem. One lives by killing the other. Therefore, if one part of the food chain is interrupted, it affects the other inhabitants of that chain as well.
When the fish population decreases in certain lakes, wildlife like bears needs to find an alternative food source. Without fish, they will not survive in that environment.
Additionally, acid rain is responsible for the population decay of the wood thrush. Female birds need more calcium to harden their eggs, so they depend on calcium-enriched foods like snails.
Again, snails cannot tolerate a pH level below 6. So, in the areas affected by acid rain, they cannot live.
The disappearance of snails due to acid rain leads to eggshell defects for birds. And, it can cause the loss of a particular type of bird in the areas of acid rain.
Animals and birds such as waterfowl search for food on the water. If the water is acidic to a certain level that they cannot tolerate, they will die.
It also happens to the birds. In the forest, birds are depended on trees for their food. If the leaves and fruits become toxic due to the acidic soil, birds will eat from toxic fruits and die.
In this way, the entire ecosystem can collapse if acid rainfall occurs more often.