. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 T. CUNLIFFE BARNES. 20 40 60 80 100 FIG. 2. Survival times of isopods in sea water in which the concentration of one ion is increased. Ordinates : average survival in hours. Abscissae: con- centration of 5/8 M KC1 and NaCl and of M CaCL in cc. per 100 cc. of modified sea water. Solid circles: KC1; open circles : NaCl; triangles: CaCL. through the 100 cc. of salt solution in several cases, but did not affect the survival times in distilled water, % M NaCl or % M KC1 (Table III). TABLE III Survival in oxygenated solu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 T. CUNLIFFE BARNES. 20 40 60 80 100 FIG. 2. Survival times of isopods in sea water in which the concentration of one ion is increased. Ordinates : average survival in hours. Abscissae: con- centration of 5/8 M KC1 and NaCl and of M CaCL in cc. per 100 cc. of modified sea water. Solid circles: KC1; open circles : NaCl; triangles: CaCL. through the 100 cc. of salt solution in several cases, but did not affect the survival times in distilled water, % M NaCl or % M KC1 (Table III). TABLE III Survival in oxygenated solutions Medium Average survival Maximum survival Number of specimens Distilled water hours 40± hours 6 8 5/8 M NaCl . ± 11 4 5/8 M KC1 ± 3 7 Discussion It is of interest to note that the aversion for sea water is similar to aversion for NaCl and in both cases the negative reaction ceases at half dilution. The quantity of KC1 in sea water is below the threshold for the negative reaction to this salt, while CaCL has no repellent action when compared with distilled water. It was suggested (Barnes, 1938) that the salts on the paper stimu- late the isopods to greater movement which compels them to collect on the salt-free side. The pronounced aversion for KC1 and positive reac-. 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. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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