Sample dilution and bacterial community composition influence empirical leucine-to-carbon conversion factors in surface waters of the world's oceans
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AuthorsTeira, E.; Hernando-Morales, V.(Víctor); Cornejo-Castillo, F.M.; Alonso-Sáez, L.(Laura); Sarmento, H.(Hugo); Valencia-Vila, J. (Joaquín); Catalá, T.S.; Hernández-Ruiz, M.(Marta); Varela-Rozados, M. (Marta); Ferrera, I.(Isabel); Morán, X.A.G. (Xosé Ánxelu Gutiérrez); Gasol, J.M.
bacterial community composition
leucine-to-carbon conversion factors
The transformation of leucine incorporation into prokaryotic carbon production rates requires the use of either theoretical or empirically determined conversion factors. Empirical leucine-to-carbon conversion factors (eCFs) vary widely across environments, and little is known about their potential controlling factors. We conducted 10 surface seawater manipulation experiments across the world’s oceans, where the growth of the natural prokaryotic assemblages was promoted by filtration (i.e. removal of grazers; F treatment) or filtration combined with dilution (i.e. relieving also resource competition; FD treatment). The impact of sunlight exposure was also evaluated in the FD treatments, and we did not find a significant effect on the eCFs. The eCFs varied from 0.09 to 1.47 kg C mol Leu-1 and were significantly lower in the filtered and diluted (FD) than in the filtered (F) treatments. Also, changes in bacterial community composition during the incubations, as assessed by Automated ...
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