Photosynthetic measurements in thecentral North Pacific: The dark loss of carbon in 24-h incubations

Eppley, R.W.; Sharp, J.H.

Limnology and Oceanography 20(6): 981-987


ISSN/ISBN: 0024-3590
DOI: 10.4319/lo.1975.20.6.0981
Accession: 068500804

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Half-day incubations (noon-sunset) and 24-h incubations (noon–noon) with 14C-labeled bicarbonate gave similar values for net primary production in the central gyre of the North Pacific (ca. 28°N, 155°W). Photosynthetic rates per light hour were nearly twice as high in 6-h as in 24-h incubations. The discrepancy seems to be due largely to dark respiration in the 24-h incubations, and the data can be used to estimate dark loss of 14C.