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Acetate incorporation into the lipids of the anemone Anthopleura elegantissima and its associated zooxanthellae

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Abstract

Anthopleura elegantissima containing zooxanthellae, as well as isolated zooxanthellae, incubated with acetate-1-14C under both light and dark conditions readily incorporate radioactivity into their total lipid pools. In both cases, the specific activity was greatly increased in the light. Dark-incubated anemones and isolated zooxanthellae incorporate activity predominantly into polar lipid; the remainder being present principally in the triglyceride moiety. Light-incubated organisms, however, show a dramatic redistribution of isotope towards greatly increased triglyceride and was ester incorporation, with a concomitant drop in polar lipid. onder light conditions, 70 to 75% of the radioactivity found in the fatty acids of the total zooxanthellae lipid was present in hexadecanoic (16:0) and octadecenoic (18:1) fatty acids. These are also the two major fatty acids by mass. Octadecanoic acid (18:0) is less than 5% by mass. Isotope incorporation patterns suggest that octadecenoic acids arise by elongation of hexadecenoic acids and that this conversion is blocked in the dark. Isotope incorporation patterns for anemones suggest that fatty acids, primarily in the form of saturated or monoenoic fatty acids, are translocated from algal to animal cells. No activity was found in either octadecadienoic (18:2) or octadecatrienoic (18:3) acids. The significance of these data is discussed.

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Authors and Affiliations

  1. Department of Biology, Georgetown University, 37th & O Sts, NW, 20057, Washington, D.C., USA

    R. S. Blanquet

  2. Marine Biological Research Division, Scripps Institution of Oceanography, University of California, San Diego, 92093, La Jolla, California, USA

    J. C. Nevenzel & A. A. Benson

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  1. R. S. Blanquet
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  2. J. C. Nevenzel
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  3. A. A. Benson
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Communicated by I. Morris, West Boothbay Harbor

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Blanquet, R.S., Nevenzel, J.C. & Benson, A.A. Acetate incorporation into the lipids of the anemone Anthopleura elegantissima and its associated zooxanthellae. Mar. Biol. 54, 185–194 (1979). https://doi.org/10.1007/BF00386597

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