AB 14:283-288 (2012)  -  DOI: https://doi.org/10.3354/ab00403

Potential grazing effects in incubations with 14C

John Marra1,*, Elisa Capuzzo2,4, Vivian Montecino3

1Aquatic Research and Environmental Assessment Center, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA
2Edinburgh Napier University, Edinburgh EH14 1DJ, UK
3Department of Ecological Sciences, Faculty of Sciences, Universidad de Chile, Santiago 3425, Chile
4Present address: Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Lowestoft NR33 OHT, UK

ABSTRACT: We conducted experiments to assess the importance of heterotrophic activities (i.e. grazing) in primary production incubations with 14C. Carbon assimilation over 12 and 24 h was measured in whole seawater and in samples that had been diluted with filtered seawater to various concentrations, in surface samples taken from the Gulf of Aqaba (Israel) in April 2008. Carbon assimilation was higher in the diluted samples by about 20%, suggesting that carbon assimilation in undiluted seawater samples is affected by grazing at time scales of 1 d or less. The difference between the diluted and undiluted samples was, however, statistically not significant. Nevertheless, incubations with 14C lasting 12 to 24 h may at times be affected by grazing loss.

KEY WORDS: Grazing · Assimilation · Incubation · Dilution · Heterotrophy

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Cite this article as: Marra J, Capuzzo E, Montecino V (2012) Potential grazing effects in incubations with 14C. Aquat Biol 14:283-288. https://doi.org/10.3354/ab00403

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