A comparison of four methods for determining planktonic community production1
Open Access
- 1 September 1987
- journal article
- research article
- Published by Wiley in Limnology and Oceanography
- Vol. 32 (5) , 1085-1098
- https://doi.org/10.4319/lo.1987.32.5.1085
Abstract
Samples from two coastal experimental ecosystems were incubated in vitro and sampled over 24 h. Production rates were measured by the 14C method, the O2 and CO2 light‐dark bottle methods, and the18O method. O2 production in the experimental enclosures (volume ∼ 1.3 × 104 liters) was also measured directly.Photosynthetic and respiratory quotients were close to 1.0. Gross production values determined by O2 light‐dark experiments, CO2 light‐dark experiments, and 18O were similar. 14C production ranged from 60 to 100% of gross production measured in CO2 light‐dark experiments, indicating that 14C uptake is not precisely fixed with respect to other measures of community metabolism. There was no evidence that 14C or any other method underestimated the rate of primary production in vitro by more than 40%. Productivities in vitro ranged from 35 to 100% of those in the mesocosm at similar light intensities.In samples from one of the ecosystems, the rate of respiration in the light (calculated from 18O data) was an order of magnitude greater than the rate in the dark. This difference may be ascribed to either photorespiration or light enhancement of mitochondrial respiration.This publication has 17 references indexed in Scilit:
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