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A+�„r�a,+ �. <br />For optimal species richness and pr�ductivity, pH should fall in a range <br />of 5.8 to 8.6 (Damell et al, 1978; Fryer, 1980; Friday, 1987) unless bog <br />soils are present (pH less than 5.0). Temperature should generally be <br />less than 20 degrees Centigrade (Welch, 1980); dissolved o�rygen <br />should be less than 4 mg/L (Ziser, 1978); specific conductivity should be <br />less than 200 mhos/cm unless groundwater discharge is occurting <br />(Adamus et al, 1987, p. 87). <br />