. The Biological bulletin. Biology; Zoology; Marine biology. RESPIRATION IN CRABS 233 temperature regression lines relative to the two salinities gives a significant differ- ence (P =). A crab at 25% sea water shows a 31% increase over that same weight crab at 75% sea water. The lines from which this weight crab was taken are significant at the one per cent level (Table II). At the higher ac- climation temperatures (Fig. 8 and Table II) crabs acclimated to the higher salinity have a higher rate of oxygen consumption and the differences at each acclimation temperature for both sali
. The Biological bulletin. Biology; Zoology; Marine biology. RESPIRATION IN CRABS 233 temperature regression lines relative to the two salinities gives a significant differ- ence (P =). A crab at 25% sea water shows a 31% increase over that same weight crab at 75% sea water. The lines from which this weight crab was taken are significant at the one per cent level (Table II). At the higher ac- climation temperatures (Fig. 8 and Table II) crabs acclimated to the higher salinity have a higher rate of oxygen consumption and the differences at each acclimation temperature for both salinities are statistically significant (P = ). Comparison of a crab acclimated to 20° C. and both salinities shows a 25% difference in rate of oxygen consumption. 200 a: I IOO < \ CM o ro 70 50 30 20 10 Sea water Accl. 25% temp. 5°C Sea water 75% Arr\ Sea water , ' 25% temp. 20°C Sea water 75% HEMIGRAPSUS OREGONENSIS Expt. temp. I0°C. j—i i i Ql Q2 Q3 05 ID 2D 3D BODY WEIGHT IN GRAMS 5D 10 Figure 7. Effect of acclimation salinity on weight-specific oxygen consumption with increasing size in Hemigrapsus oregonensis at two acclimation temperatures (5° and 20° C). Regression lines were fitted by the method of least squares. Slope values are given in Table I, significance of slope change and other data are given in Table II. The two intermediate ac- climation temperatures (10° and 15° C.) are not included but the analyses are given in the tables. Reference to Figure 8 and Table II indicates no significant changes in slope either for a given acclimation temperature regression line compared at two salinities or total regression lines. The response of this species at the 20° C. experimental temperature shows no statistically significant differences when any acclimation regression line is compared at the two salinities, or when slopes are compared (Table II). Interspecific comparison: When these two species are compared with regard to their acclimation
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