Translocation of carbon and nitrogen from the turbellarian host Amphiscolops langerhansi (Turbellaria: Acoela) to its algal endosymbiont Amphidinium klebsii (Dinophyceae)

The movement of carbon and nitrogen from Amphiscolops langerhansi , fed on ¹⁴C- and ¹⁵N-labelled Tigriopus japonica , to its algal endosymbiont Amphidinium klebsii is examined in a series of experiments designed to detect both sources in the host and utilization by the symbiont. Data for carbon indicate that.1. klebsii utilizes host carbon primarily as respired CO₂ taken up in photosynthesis. Data for nitrogen suggest that translocation takes place primarily through the excretion of ammonia, and that uptake and incorporation by the alga is light-dependent.