According to the Encyclopedia of LIfe, an indicator species is an organism whose presence, absence or abundance reflects a specific environmental condition.
It can be used to monitor ecosystems but should not be the only source of information; doing so would could be detrimental as it is not the only organism within the area.
Encyclopedia of Life. Retrieved from http://eol.org/info/465
Pages in category "Indicator Species"
This category contains only the following page.