. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100, 50 100 150 200 250 300 350 400 450 mM I I I I I I 14 21 %o SALINITY 24 28 ISOSMOTIC LINE: = 366mM No/I = 693mOSM/l • FW-No O 24 %0-No A FW-OSMOLARITY A 24 %o-OSMOLARITY. 12 18 24 30 36 TIME (h ) 42 48 CO O E cr CO O 0 o 3 CD FIGURE 6. (A) Blood Na+ concentrations in shrimp gradually acclimated to a specific salinity from 0%o to 28%o. Animals were held at a given test salinity 48 h before sampling. Points are mean ± SE of at least eight animals per salinity. (B) Time course change in blood Na+ and total osmolarity after
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100, 50 100 150 200 250 300 350 400 450 mM I I I I I I 14 21 %o SALINITY 24 28 ISOSMOTIC LINE: = 366mM No/I = 693mOSM/l • FW-No O 24 %0-No A FW-OSMOLARITY A 24 %o-OSMOLARITY. 12 18 24 30 36 TIME (h ) 42 48 CO O E cr CO O 0 o 3 CD FIGURE 6. (A) Blood Na+ concentrations in shrimp gradually acclimated to a specific salinity from 0%o to 28%o. Animals were held at a given test salinity 48 h before sampling. Points are mean ± SE of at least eight animals per salinity. (B) Time course change in blood Na+ and total osmolarity after an abrupt transfer from 0%o to 24%o. Points are mean ± SE of data from 8-15 animals per interval. and therefore indicates uptake by the animals themselves. This is the first report of ammonia uptake by higher aquatic animals, although several authors have sug- gested that possibility. Maetz (1973) found that sodium influx to goldfish was inhibited by increased ammonia in the water, yet ammonia excretion was not. He concluded that an NHJ/NH! exchange was operative, but did not pursue its possible significance. During experiments to study the excretion of ammonia as NH| or NH3 from marine invertebrates, Mangum et al. (1978) found that total ammonia of ambient water in vessels holding the clam Rangia cuneata declined from 5 to mM during tests. Discounting loss by volatilization, they concluded that at least some ammonia permeated the body. Shaw (1960) reported the competitive inhibition of Na4 influx into crayfish by NHI and postulated that this implied movement of the latter into animals. Thomas et al. (1976) reported enhanced growth of the gastropod Biom- phalaria glabrata in alkaline water containing high concentrations of ambient. 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 La
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
