Carbon-13 Depletion in a Subalpine Lake: Carbon Flow Implications

Science  08 Sep 1978:
Vol. 201, Issue 4359, pp. 901-902
DOI: 10.1126/science.201.4359.901


Plankton (larger than 76 micrometers) taken from an undisturbed oligotrophic was found to have δ13C values (=13/12C relative to the Pee Dee be- belemnite standard) rangingfrom –44 to –47 per mil. This extraordinary 13C depletion, together with characteristics of the inorganic carbon pool, indicates that lake respiration as well as surrounding soil respiration provide important carbon sources for plankton production in this lake.