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Difficulties in interpretation of microbial heterotrophy from sulfate uptake data: Laboratory studies 1
Author(s) -
Monheimer Richard H.
Publication year - 1978
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1978.23.1.0150
Subject(s) - heterotroph , sulfate , axenic , scenedesmus , sulfur , algae , environmental chemistry , sulfur cycle , mixotroph , chlorella , chemistry , scenedesmus obliquus , biology , botany , bacteria , organic chemistry , genetics
Inorganic carbon uptake (primary production) and sulfate uptake were studied in axenic cultures of a Chlorella sp., a Nannochloris sp., and a Scenedesmus sp. All of the cultures took up significant amounts of sulfate in the dark, and it is concluded that the direct use of dark sulfate uptake as a measure of in situ bacterial heterotrophic production is probably not valid. The C:S uptake ratios of the algal cultures in the light also varied widely so that the indirect use of a single C:S value for calculating microbial heterotrophic production is also not valid. Carbon:sulfur uptake ratios appear to have some regular but complex relationship to primary production.