A compromise exists. The idea is to study a representative sample of an ecosystem that can provide quick, yet reliable, information. In scientific terms, these sample species are known as bioindicators. Such animals don't always provide an accurate picture of what is really happening in the environment. Pearson has compiled a set of guidelines to help solve this problem.
Scientists can refer to the guidelines to choose an appropriate bioindicator.
This way, research from one area will have value for study in other parts of the world. This sensitivity can serve as an early warning system for the whole ecosystem. Pearson says that these criteria vary in importance depending on the purpose of the study.