. The Biological bulletin. Biology; Zoology; Marine biology. TEMPERATURE TOLERANCE IN CRABS 163 100- 80- > Z) en LU o (T UJ Q_ 60- 40- 20- 0- HEMIGRAPSUS NUDUS SUMMER BASE LINE 20°C, 35% SEA WATER 5 ANIMALS / DISH. 3295 24 —i- 26 28 30 32 34 TEST TEMPERATURE Figure 6. The influence in Hcmigrapsus nudus of differing densities of crabs per 4 liters of sea water on the 50 per cent survival temperature at 12 hours with a previous history of 20° C, 35 per cent sea water: 5 animals per dish (O), 10 to 15 animals per dish (#), 19 to 28 animals per dish (A). Each point represents the average surviv
. The Biological bulletin. Biology; Zoology; Marine biology. TEMPERATURE TOLERANCE IN CRABS 163 100- 80- > Z) en LU o (T UJ Q_ 60- 40- 20- 0- HEMIGRAPSUS NUDUS SUMMER BASE LINE 20°C, 35% SEA WATER 5 ANIMALS / DISH. 3295 24 —i- 26 28 30 32 34 TEST TEMPERATURE Figure 6. The influence in Hcmigrapsus nudus of differing densities of crabs per 4 liters of sea water on the 50 per cent survival temperature at 12 hours with a previous history of 20° C, 35 per cent sea water: 5 animals per dish (O), 10 to 15 animals per dish (#), 19 to 28 animals per dish (A). Each point represents the average survival of at least thirty animals. Discussion Acclimation to a high temperature, with resulting increase in the high tem- perature tolerance of the species, has been demonstrated many times (Sumner and Doudoroff, 1938; Brett, 1946; Mellanby, 1954; Spoor, 1955; McLeese, 1956). The two species of crabs, H. nudus and H. oregonensis, studied here, would seem to be no exception. Temperature tolerance in conjunction with salinity has been studied less extensively, and it was of interest to find that the salinity had a very marked effect on the temperature tolerance of the species. Although results from. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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