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Aeschynomene fluminensis (red line) and Polygonum acuminatum (black line) of environments with (+PHg and +AHg) (●) and without (-PHg and -AHg) (▲) mercury, using the Hill Series. For the parameter a = 0, the diversity value is equal to the number of species in the sample. For the a tending to 1, the diversity value is equivalent to the Shannon index. For a = 2, the value equals the Simpson index.
