. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. J_ _L 12 IS TIME (h ) 18 21 24 27 30 4 6 TIME (h ) 10 FIGURE 3. Concentrations of protein in the hemolymph of M. rosenbergii following a transfer from 0 %o to 24 %«. Points are means ± SE, sample size in parenthesis. O = FW, • = 24 %o. FIGURE 4. Concentrations of total primary amino acids in hemolymph of M. rosenbergii transferred from FW (O) to 24%o (•). Points are means ± SE of 10-14 animals per time. In contrast, total blood osmolarity increased mOsm-P1 -h"1 and was isosmotic to 24%o (693 mOsm-r1) 20 h after tra
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. J_ _L 12 IS TIME (h ) 18 21 24 27 30 4 6 TIME (h ) 10 FIGURE 3. Concentrations of protein in the hemolymph of M. rosenbergii following a transfer from 0 %o to 24 %«. Points are means ± SE, sample size in parenthesis. O = FW, • = 24 %o. FIGURE 4. Concentrations of total primary amino acids in hemolymph of M. rosenbergii transferred from FW (O) to 24%o (•). Points are means ± SE of 10-14 animals per time. In contrast, total blood osmolarity increased mOsm-P1 -h"1 and was isosmotic to 24%o (693 mOsm-r1) 20 h after transfer (Fig. 6B). DISCUSSION Although an essential ingredient of many organic compounds, ammonia is usually viewed as a potentially toxic molecule, excreted from organisms as anabolic requirements are exceeded by catabolic release from assimilated food and by turn- over of endogenous nitrogen compounds. Having once left an organism, ammonia per se is not thought to re-enter the bodies of higher aquatic animals except in toxic situations. We have shown in this study that when the euryhaline shrimp M. rosenbergii is subjected to a hyperosmotic shock, external ammonia decreases dur- ing the first 20-24 h after transfer to saltwater. This loss of ambient ammonia cannot be accounted for by bacterial uptake or aerial diffusion to the atmosphere, rr Q 700 650 600 550 125 IOO 75 50. GLYCINE STD I _|_ PROLINE STD J I I 12 18 24 30 TIME (h ) 350 325 300 275 50 375 25 rr O Lu 21 E 36 42 48 FIGURE 5. Concentrations of free amino acids in the tail muscle of M. rosenbergii acclimated to FW (open symbols) and following abrupt transfer to 24%« (closed symbols) for 48 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. )
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
