Uptake of dissolved inorganic nitrogen by the symbiotic clam Tridacna gigas and the coral Acropora sp. |
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| Authors: | F P Wilkerson R K Trench |
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| Institution: | (1) Department of Biological Sciences and Marine Science Institute, University of California at Santa Barbara, 93106 Santa Barbara, California, USA;(2) Present address: Allan Hancock Foundation, University of Southern California, University Park, 90089 Los Angeles, California, USA |
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| Abstract: | Dissolved inorganic nitrogen flux was studied in the giant clam Tridacna gigas and the corals Acropora sp. and Tubastrea micrantha from the tropical reefs of Belau, Micronesia in 1983. T. micrantha, a nonsymbiotic coral, excreted ammonium. However, Tridacna gigas and Acropora sp., which contain symbiotic dinoflagellates (zooxanthellae) were able to take up both ammonium and nitrate. The requirement for a previous light exposure to sustain uptake by T. gigas is reported. The uptake kinetics of these symbioses are described and include the capacity of the zooxanthellae for  surge uptake when given nutrient spikes.Contribution No. 417 of the Allan Hancock Foundation |
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