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Effect of Cysteine and Methionine on Sulfate Uptake and Primary Productivity by Axenic Cultures and Lake Microplankton Communities

TitleEffect of Cysteine and Methionine on Sulfate Uptake and Primary Productivity by Axenic Cultures and Lake Microplankton Communities
Publication TypeJournal Article
Year of Publication1979
AuthorsMonheimer, RH
JournalJournal of Phycology
Volume15
Pagination284-288
Keywordsbiology
Abstract

The presence of up to 500 μg sulfur·l−1 of an equimolar mixture of cysteine and methionine had virtually no effect on the SO42- uptake rate of Navicula pelliculosa, (Bréb.) Hilse whereas the rate of Ankistrodesmus falcatus (Corda) Ralfs was decreased by the presence of 500 μg S· l−1 and Anabaena flos-aquae (Lyngbye) Bréb. by 50 μg S·l−1. Primary productivity in these axenic cultures was affected (decreased) only in A. falcatus. The C:S uptake ratio was lowest in N. pelliculosa and highest in A. falcatus. Considering these species as representative of groups of naturally occurring algae, patterns of SO42- uptake and primary productivity in a eutrophic and a moderately oligotrophic lake reflected the results of the algal culturing experiments: SO42- uptake rates, relative to primary productivity, were higher in the presence of diatoms and bluegreen algae and lower when green algae were present; the addition of the cysteine I methionine mixture to the lake waters decreased the rate of microplankton SO42- uptake in correlation with the makeup of the algal community; primary productivity decreased upon the addition of cysteine I methionine when green algae were relatively abundant. It is concluded that, in most fresh water systems, the effects of organic sulfur pollution on algal SO42- uptake and primary productivity are insignificant as compared to other ecological changes that occur due to that pollution.

URLhttp://onlinelibrary.wiley.com/doi/10.1111/j.0022-3646.1979.00284.x/abstract
DOI10.1111/j.0022-3646.1979.00284.x