Coupled transformation of inorganic stable carbcn‐13 and nitrogen‐15 isotopes into higher trophic levels in a eutrophic shallow lake1

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Abstract
Enclosure and bag experiments were done in a eutrophic shallow lake with simultaneous use of inorganic 13C and 15N isotopes. It was demonstrated that coupled transformation of inorganic carbon and nitrogen can occur into herbivorous zooplankton through phytoplankton. Direct evidence is provided that there is an apparent coupling between photosynthesis and inorganic nitrogen uptake by phytoplankton during daytime under natural conditions and that the coupling occurs at a constant ratio.