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- Title
Primary production in lakes Huron and Michigan: in vitro and in situ comparisons.
- Authors
Fahnenstiel, Gary L.; Carrick, Hunter J.
- Abstract
Oxygen- and carbon-14-based primary production estimates from 9–16 h incubations were compared in lakes Huron and Michigan. For surface mixing layer compansons, gross O/C photosynthetic quotients (gross PQ) averaged 2.2, and net O/C photosynthetic quotients (net PQ) averaged 1.4. The mean gross PQ is consistent with a theoretical P0 based on the CO and NO assimilation ratio. However, within the deep chlorophyll layer, gross PQ and net PQ averaged 4.9 and 2.8 respectively. These higher values were likely due to excess NO reduction at the expense of CO uptake. Thus, during short experiments under low light conditions, oxygen evolution and CO uptake may not be tightly coupled. and O production estimates were compared in four diurnal (dawn to dusk) experiments in Lake Huron. In situ production estimates were determined by measuring water-mass oxygen changes and oxygen transfer across the air-water interface. production estimates were approximately twice production estimates for both surface mixing layer and deep chlorophyll layer comparisons. The difference between estimates was attributable to containment effects manifest in 13–16 h bottle incubations. Short-term (1–2 h) production was also compared to diurnal in vitro production. Rates of short-term production were ˜1.6 times higher than rates of diurnal production, suggesting that short-term production experiments may provide reasonable estimates of primary production.
- Publication
Journal of Plankton Research, 1988, Vol 10, Issue 6, p1273
- ISSN
0142-7873
- Publication type
Article