% of world primary productivity
||Duursma EK, Boisson MPRM, Global oceanic and atmospheric oxygen stability considered in relation to the carbon-cycle and to different time scales. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 2 , P. 117-141 link p.135 right column 3rd paragraph
||Taube M. (1992). Evolution of matter and energy, in: The Natural Environment and the Biogeochemical Cycles, vol. 1, part F, O. Hutzinger, editor. The Handbook of Environmental Chemistry SpringerVerlag, Heidelberg, Germany, 65-182
||P.135 right column 3rd paragraph: "Despite the fact that the oceans only contain 0.22% of the world's biomass, their primary productivity is in great measure due to a much more rapid turnover of the oceanic biomass, viz., 54 % of the world primary production (cf. Tab. 2 and primary source)."