. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SALINITY ON ARTEMIA NUTRITION 245. FIGURE 12. Albumin and AMP requirements at high salinity (120/;'f); both abscissae AMP in mg'/( ; albumin: open circles, 5 mg%; closed circles, 20 mg%; closed triangles, 40 mg% ; ordinates growth and survival, see Figure 1. At 120%o salinity, albumin deficiency is detrimental whatever AMP concentra- tion. Growth index increases with AMP concentration only for above optimal (40 mg%) albumin concentration (Fig. 12). In an AMP deficient medium (20 mg%) the supernumerary gonopode morphogenesis
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SALINITY ON ARTEMIA NUTRITION 245. FIGURE 12. Albumin and AMP requirements at high salinity (120/;'f); both abscissae AMP in mg'/( ; albumin: open circles, 5 mg%; closed circles, 20 mg%; closed triangles, 40 mg% ; ordinates growth and survival, see Figure 1. At 120%o salinity, albumin deficiency is detrimental whatever AMP concentra- tion. Growth index increases with AMP concentration only for above optimal (40 mg%) albumin concentration (Fig. 12). In an AMP deficient medium (20 mg%) the supernumerary gonopode morphogenesis is induced only with an albumin excess (40 mg%). These results confirm the higher albumin requirement and lower AMP requirement with increasing salinity. DISCUSSION The problem of energy sources in Crustacea was studied by Renaud (1949) and the results of her work led Vonk (1960) to conclude that Crustacea metabolism is mainly centered around glycogen and fatty acids. But according to Huggins and Munday (1968) the relative significance of carbohydrate in meeting the basic energy requirement still requires further investigation. The large amount of free amino acids in Crustacea and the variability of this amount under conditions leading to an energetic adjustment may be considered as indicating the use of amino acids in the process of energy production (Gilles, 1970). In Artcinia medium the energy requirement is met by starch or lecithin at 24%o salinity. More ener- getic nutrient and more AMP were needed for optimal growth as the albumin level increased. The Artcmia purine nucleotide requirement is specific and ab- solute. "With a given albumin concentration, growth rate and abdominal length increase with AMP concentration (Hernandorena, 1972b). In DrosopJiila de- velopmental rate and ultimate size depend on the protein concentration of the did (Sang, 1959). Dietary RNA requirement depends on protein concentration (Geer, 1963) and RNA requirement reflects essentially an AM
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
