One effect of acid rain on an ecosystem is?

The death of fish in an acquatic ecosystem

Explanation:

The ecosystems which may suffer the most with the effect of the acid rain are the aquatic ecosystems such as lakes, rivers, streams, and the ocean. For example, if acid rain falls into a lake, the acidity of that lake will change and several fish (A) will die.

Bigger fish (B) which feed from fish (A) will suffer the reduction of food and as a consequence will also die. Following individuals of that same trophic chain will be affected so the energy flow will be altered. The ecosystem will suffer the consequence of being contaminated with the acid rain.  

most community's take hundreds of years to become stable