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Oxygen production was measured in the anemone Aiptasia pallida (Verrill) maintained at varying feeding regimes in the laboratory. Host feeding regime had no significant effect on: (1) zooxanthellal gross photosynthesis (GPP max ) expressed as µg O 2 · µg chl a -1 · h -1 or µg O 2 · 10 6 zooxanthellae -1 · h -1 ; (2) the light intensity at which ½ GPP max occurs (K m ); or (3) the chlorophyll a content of the zooxanthellae. Starvation significantly reduced GPP max expressed as µg O 2 · mg host protein -1 · h -1 and zooxanthellal density within the host. Zooxanthellal translocation efficiency was measured by short term incubations of anemones in NaH 14 CO 3 . Host feeding regime had no effect on the percentage of 14 C translocated to the host. These results suggest that, under these conditions, starvation did not alter the photosynthetic capability of the zooxanthellae but decreased total photosynthate translocated to the host by decreasing zooxanthellal density within the host.

HOST FEEDING REGIME AND ZOOXANTHELLAL PHOTOSYNTHESIS IN THE ANEMONE, AIPTASIA PALLIDA (VERRILL)