. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 B. H. TER KU1LE AND J. EREZ Table II Protein and chlorophyll measurements of Amphistegma lobifera and Amphisorus hemprichii (duplicate measurements mi ditlerent si:e groups) Protein Organism (Mg/mg weight foram ) (Mg) A lobifera 340 340 60 60 A . hemprichii 1107 1107 283 283 Ratio protein/ chlorophyll Organism weight .4. lobifera A. hemprichii >250 75-250 2000 >2000 <500 <500 I). Under the experimental conditions, specimens of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 B. H. TER KU1LE AND J. EREZ Table II Protein and chlorophyll measurements of Amphistegma lobifera and Amphisorus hemprichii (duplicate measurements mi ditlerent si:e groups) Protein Organism (Mg/mg weight foram ) (Mg) A lobifera 340 340 60 60 A . hemprichii 1107 1107 283 283 Ratio protein/ chlorophyll Organism weight .4. lobifera A. hemprichii >250 75-250 2000 >2000 <500 <500 I). Under the experimental conditions, specimens of the size range used in this study (around 70 Mg) grew at a daily rate of about 3%/day. This rate was determined op- tically, by converting size increase to weight increase (ter Kuile and Erez, 1984), and by the incorporation of UCO32~ into the skeleton. Approximately () Mg C/mg foram/24 h net is fixed photosynthetically by the symbionts. The chlorophyll:protein ratio does not change with size (Table II), indicating that the symbionts grow in proportion to the organic matter. When growing at a rate of 3% a day, the symbionts need Mg C/mg foram/24 h for growth. Hence, a net amount of Mg C/ mg foram/24 h will be available for translocation to the host. Calculations based on the results of pulse-chase ex- periments indicate a transfer of Mg C/mg foram/24 h. At the measured growth rate, the host needs Mg C/mg foram/24 h for growth. Transfer of respired Ci to the skel- eton amounts to Mg C/mg foram/24 h. Loss of respired Ci to the environment is roughly Mg C/mg foram/24 h. Incorporation into the skeleton is Mg C/mg foram/ 24 h (Table I). This carbon is initially concentrated in the pool which, in turn, derives Mg C/mg foram/24 h from respired carbon (see above) and, by balance. Mg C/mg foram/24 h is taken up directly from seawater. When no feeding occurs, the budget is balanced with respect to up- take, growth, and respiration. During fe
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