Lastly, the general goal of bioindicators is to use a single species, or a small group of species, to evaluate the standard of an surroundings and how it modifications over time, but this will symbolize a gross oversimplification of a complex system. Accordingly, populations of indicator species may be influenced by factors apart from the disturbance or stress (e.g., illness, parasitism, competitors, predation), complicating our image of the causal mechanisms of change. In some situations, we cannot discriminate pure variability from changes due to human
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