Dark Sulfate Uptake and Bacterial Productivity in a Subalpine Lake
1975
Jassby, Alan D.
Dark uptake of ³ ⁵SO₄ was investigated as a possible method for estimating bacterial production rates in Castle Lake, California. Assuming a fixed cellular sulfur; carbon ratio, bacterial productivities determined in this manner ranged from 2.5 to 28 mg C°m.— ³°day— ¹ in 48 in situ measurements in the summer of 1972. Average production rates increased throughout the sampling period and corresponded in part to increasing levels of dissolved organic carbon. Production rates were stimulated by addition of NH₄Cl and vitamin B₁ ₂ to water samples, but not by thiamine, biotin, SO₄, NO₃, PO₄ or a trace metal mix. Further studies on the sulfur content of bacteria and the role of phytoplankton in SO₄ uptake are required before dark ³ ⁵SO₄ uptake is used for routine field measurements.
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