. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSMOREGULATION IN ISOPODS 99 Ai 12° c. Ligia occidentalis I 25% 50% 75% Ae 100% 125% «0% 175% Sea water percentage FIGURE 1. The relation of the osmotic concentration of the haemolymph (At) of Ligia occidentalis to the concentration of the medium (Ae) at 12° C (continuous line) and 22° C (broken line). Two times the standard error has been plotted on each side of the means for internal osmotic concentrations at each temperature-salinity concentration. at 22° C (P ). It was found that throu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSMOREGULATION IN ISOPODS 99 Ai 12° c. Ligia occidentalis I 25% 50% 75% Ae 100% 125% «0% 175% Sea water percentage FIGURE 1. The relation of the osmotic concentration of the haemolymph (At) of Ligia occidentalis to the concentration of the medium (Ae) at 12° C (continuous line) and 22° C (broken line). Two times the standard error has been plotted on each side of the means for internal osmotic concentrations at each temperature-salinity concentration. at 22° C (P ). It was found that throughout the series of experimental salinities, animals adapted at 12° C showed significantly different osmotic concentrations of haemolymph from those adapted at 22° C (temperature-salinity interaction, F " , P < ). At both temperatures, however, Ligia occidentalis is a slight hyperosmotic regulator in concentrations of sea water of less than 100% and a hypoosmotic regulator in concentrations above 100% (Fig. 1). Effects of size and From each temperature-salinity medium, an equal number of male and female animals between and g wrere selected for measurements of osmotic concentration. Sex, weight, and internal osmotic pressure of animals in 150%, 100%, and 50% sea water at 12° and at 22° C were determined. No significant differences in regulatory abilities in relation to weight or sex could be demonstrated. Rates of osmotic and u'CujJit cliangc. Animals adapted to 150% sea water at 12° and 22° C were transferred to 50% sea water at the same temperatures. Internal osmotic concentrations and weights were determined at 0, 2, 4, 8, 16, 24, and 48 hours. These measurements are plotted in Figures 2 and 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 Labor
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
