Batchelder, A.R.
(1982)
Lake trophic state and algal growth as influenced by cation concentrations.
Other.
Agricultural Research Service, Washington, USA.
Abstract
Laboratory experiments were conducted to evaluate the
effects of variations in the Ca, Mg, and Na concentrations
in eutrophic waters on the standing crop and growth rates
of three algal species. Each species was grown in a
standard nutrient medium enriched with Ca, Mg, and Na
in varying combinations and at concentrations of 2 and 8
milliequivalents per liter (meq/L) each. The dry weights of
Anabaena subcylindrica and Selenastrum capricornutum
were reduced by the 8 meq/L Mg treatment, but the toxic
effects were overcome by adding Ca to the A. subcylindrica
and Ca and Na to the S. capricornutum. None of
the cation concentration variations affected the standing
crop of Chlorella ellipsoidea. The addition of Na alone to
the cultures produced little or no effect, but in combination with added Ca and Mg, it enhanced the growth
rates of A. subcylindrica and S. capricornutum. Neither
pH, monovalent to divalent cation ratio, or ionic strength
of the media affected the algal growth in these studies...
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