. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 206 TH. VON BRAND, M. O. NOLAN, AND E. R. MANN various batches and to small differences in their nutritional state. These differences do not, however, interfere with an evaluation of the experiments since the figures found during exposure to the experimental temperatures and those obtained during the recovery period could be expressed in per cent of the initial value, thus elimi- nating any influence of these variations. The oxygen consumption of the snails (Table 3) increased in the range ° to 37° C. At 41° C., however,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 206 TH. VON BRAND, M. O. NOLAN, AND E. R. MANN various batches and to small differences in their nutritional state. These differences do not, however, interfere with an evaluation of the experiments since the figures found during exposure to the experimental temperatures and those obtained during the recovery period could be expressed in per cent of the initial value, thus elimi- nating any influence of these variations. The oxygen consumption of the snails (Table 3) increased in the range ° to 37° C. At 41° C., however, the animals were definitely damaged. Their respira- tory rate decreased, and it did not come back to the original level during the recovery period. After the end of the recovery period, the snails were kept in beakers over night at room temperature and it was found that all were dead the following morn- ing. The lowest temperature employed, ° C., was also damaging. The respira- tory rate increased only slowly after the snails had been transferred back to 30° C., and, after being kept over night at room temperature, about half the snails were dead. All other temperatures were well tolerated and the respiration returned during the recovery period to the pre-experimental value. Z O I- Q- 5 D CO Z O u ^ UJ O UJ U o; LJ Q_ O O _L 32 33 34 35 36 X I04 37 38 FIGURE 2. Temperature relationships of the oxygen consumption of Australorbis glabratus in the range ° to 37° C. expressed according to Arrhenius' equation. Using the percentage oxygen figures, the temperature relationship was then cal- culated according to Arrhenius' equation (Fig. 2) for the range ° to 37° C. A single straight line was obtained and the /A value of 17,400 is entirely within the normal range. Upon projection of the percentage figures on Krogh's (1914) normal curve a very satisfactory agreement to this curve was obtained (Fig. 3). Krogh's curve has been established only for the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
