Article: Dimethylsulfoniopropionate in Giant Clams (Tridacnidae).

RICHARD W. HILL [l],[*]

JOHN W. H. DACEY [2]

AHSER EDWARD [3]

Abstract. The tridacnid clams maintain symbiotic associations with certain dinoflagellates (termed zooxanthellae). Tridacnids are thus candidates to have high tissue concentrations of dimethylsulfoniopropionate (DMSP), a tertiary sulfonium compound that is not synthesized by animals but is commonly produced by dinoflagellates. This study establishes that DMSP is about an order of magnitude more concentrated in the light-exposed and shaded mantle and gills of Tridacna maxima and T. squamosa than in any other known animal tissues. The DMSP concentration in the light-exposed, siphonal ...

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