Abstract
Stimulation of photosynthate excretion from zooxanthellae and free-living algae by tissue homogenate of several bivalves was studied. Mantle tissue homogenate of Tridacna derasa enhanced 10-to 15-fold excretion of photosynthetically fixed carbon from freshly isolated zooxanthellae within 2 h incubation. Maximum carbon excretion was 35 to 45% of the total carbon fixed. This excretion stimulating activity was detected in the homogenates of the mantle, adductor muscle, gill, and kidney. However, no excretion stimulating activity was detected in the haemolymph. The excretion stimulation activity of mantle homogenate, directed against freshly isolated zooxanthellae from T. derasa, was higher in bivalves belonging to the Tridacnidae (T. derasa, T. crocea, T. maxima, T. squamosa, Hippopus hippopus) than in the Cardiidae (Fragum fragum, F. mundum, F. unedo), non-symbiotic bivalves (Mytilus edulis, Meretrix lusoria, Ruditapes philippinarum) or gastropods (Umbonium giganteum, Turbo argyrostoma). The mantle homogenate of T. derasa enhanced photosynthate excretion by free-living algae belonging to the Dinophyceae (Prorocentrum micans, Amphidinium carterae, and Heterocapsa triquetra) but did not enhance its excretion by free-living algae belonging to the Chlorophyceae, Cyanophyceae, Rhodophyceae, Prasinophyceae, and Haptophyceae. T. derase used in this study originated from Belau (Palau). T. crocea, T. squamosa, T. maxima, H. hippopus and F. unedo were collected at Ishigaki Island in Okinawa in 1992. F. mundum and F. fragm were collected at Okinawa Island in 1992.
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Communicated by T. Ikeda, Nagasaki
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Masuda, K., Miyachi, S. & Maruyama, T. Sensitivity of zooxanthellae and non-symbiotic microalgae to stimulation of photosynthate excretion by giant clam tissue homogenate. Marine Biology 118, 687–693 (1994). https://doi.org/10.1007/BF00347517
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DOI: https://doi.org/10.1007/BF00347517