Premium
Dark Sulfate Uptake and Bacterial Productivity in a Subalpine Lake
Author(s) -
Jassby Alan D.
Publication year - 1975
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1935496
Subject(s) - environmental chemistry , phytoplankton , sulfur , sulfate , dissolved organic carbon , productivity , chemistry , trophic state index , carbon fibers , environmental science , ecology , trace metal , nutrient , biology , metal , materials science , macroeconomics , organic chemistry , composite number , economics , composite material
Dark uptake of 3 5 SO 4 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 NH 4 Cl and vitamin B 1 2 to water samples, but not by thiamine, biotin, SO 4 , NO 3 , PO 4 or a trace metal mix. Further studies on the sulfur content of bacteria and the role of phytoplankton in SO 4 uptake are required before dark 3 5 SO 4 uptake is used for routine field measurements.