. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AMMONIA. 2 I 2 3 4 5 6 7 8 9 10 II 12 13 14 HOURS DAYS TIME FIGURE 4. Activity (A, 0 = operculum closed, = foot out, but not attached, = foot out and attached to substrate), ammonia excretion (B, in ^moles-g dry weight'1 • h ') and primary amine excretion (C, in ^moles • g dry weight'' • h~') over 14 days in Thais haemastoma directly transferred from 10 to 30%«. (x±, n = 12). by hour 24. The total FAA pool at 24 h after transfer is not significantly different in the NH4+-spiked transfers and in the control transf
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AMMONIA. 2 I 2 3 4 5 6 7 8 9 10 II 12 13 14 HOURS DAYS TIME FIGURE 4. Activity (A, 0 = operculum closed, = foot out, but not attached, = foot out and attached to substrate), ammonia excretion (B, in ^moles-g dry weight'1 • h ') and primary amine excretion (C, in ^moles • g dry weight'' • h~') over 14 days in Thais haemastoma directly transferred from 10 to 30%«. (x±, n = 12). by hour 24. The total FAA pool at 24 h after transfer is not significantly different in the NH4+-spiked transfers and in the control transfer due mainly to the very large variation in alanine concentration at 24 h in the control transfer ( ± ^moles • g dry weight"1—Table V). DISCUSSION Thais haemastoma is a euryhaline species that partially regulates its volume by changes in the intracellular free amino acid pool. The FAA pool of T. haemastoma is composed of a mixture of seven quantitatively important free amino acids (Table I) rather than being dominated by a single free amino acid, such as taurine, as occurs in T. lapillus (Stickle et ai, in press). When subjected to altered salinity, volume regulation is achieved by the rapid initial alteration of the intracellular concentrations of alanine and glycine. The water content of Thais haemastoma remained remarkably constant across acclimation salinities (Table II), and had returned to the steady state level two weeks after a direct salinity transfer in either direction between 30 and 10%o (Fig. 3). Since the analysis of variance for water content versus salinity was not significant over the range of 5 to 30%o, we must assign a value of zero to Oglesby's (1975) beta. Hildreth. 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.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
