The calculations for optima and tolerance ranges is conducted according to the article by Birks et al. (1990). A case study for this technique is shown in Potapova & Charles (2003):
Birks, H.J.B., Line J.M., Juggins S., Stevenson A.C., and Ter Braak C.J.F. (1990). Diatoms and pH reconstruction. Philosophical Transactions of the Royal Society B 327:263–278
Potapova, M., & Charles, D. F. (2003). Distribution of benthic diatoms in US rivers in relation to conductivity and ionic composition. Freshwater Biology, 48(8), 1311-1328.
Sample data is taken from:
Sathicq, Maria Belen. (2017). Empleo de descriptores fitoplanctonicos como biomonitores en la evaluacion de la calidad del agua en la costa del Rio de la Plata (Franja Costera Sur). PhD thesis. <http://hdl.handle.net/10915/58915>
op_calculate() op_lists() op_plot()
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