Biologically-mediated carbon export transports carbon from the sunlit surface layers into the ocean's interior where it can be sequestered for centuries.  It is a process mediated primarily by plankton ecology, particularly the phytoplankton that fix inorganic carbon and zooplankton that either rerespire it or repackage it into larger particles.  On a cruise in the CCE, we tracked parcels of water for four-day "cycles" during which we measured carbon flux and biological rates while measuring net changes to the plankton community.  These experimental cycles provided us with a unique opportunity to directly compare trophic cycling to the biological pump of carbon out of the surface ocean.  A series of trophic cycling equations were constructed to estimate the flow of carbon through and out of the ecosystem.  These simple relationships suggest that experimentally-measured carbon flux rates were consistent with export on mesozooplankton fecal pellets.