. The Biological bulletin. Biology; Zoology; Marine biology. 234 PAUL A. DEHNEL 200 9 100 < 70 ® 50 CM o to 30 20 10 Accl. temp. 5°C Accl. temp- 2<fC Seo water 25% HEMIGRAPSUS NUOUS Expt. temp. I0°C. _i_j ' i « 01 02 Q3 05 ID 2D 3j0 BODY WEIGHT IN GRAMS 5j0 70 10 Figure 8. Effect of acclimation salinity on weight-specific oxygen consumption with increasing size in Hemigrapsus nudus 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 Tabl
. The Biological bulletin. Biology; Zoology; Marine biology. 234 PAUL A. DEHNEL 200 9 100 < 70 ® 50 CM o to 30 20 10 Accl. temp. 5°C Accl. temp- 2<fC Seo water 25% HEMIGRAPSUS NUOUS Expt. temp. I0°C. _i_j ' i « 01 02 Q3 05 ID 2D 3j0 BODY WEIGHT IN GRAMS 5j0 70 10 Figure 8. Effect of acclimation salinity on weight-specific oxygen consumption with increasing size in Hemigrapsus nudus 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 acclimation temperatures (10° and 15° C.) are not included but the analyses are given in the tables. are similar in position and slope. Low temperature, low salinity combination gives the greater rate. If, however, crabs are acclimated to high temperature at both low and high salinities, H. nudus has the higher rate at the high salinity combination and H. oregonensis at the low salinity combination. Percentage differences of a animal for both species are approximately the same, 25%. Effect of size Hemigrapsus oregonensis: Reference to Figure 5 and Table I shows that there is a statistically significant change (P = ) in slope (decrease) as the ac- climation temperature increases, when crabs are measured at 10° C. experimental temperature, and maintained at the low acclimation salinity. The fact that the four regression lines converge at the higher end of the weight range shows that weight-specific oxygen consumption of small animals, except at the low temperature, is affected by increase of acclimation temperature to a greater degree than large ones. With increasing weight there is a smaller change in rate for 20° C. ac- climated animals than for 5° C. ones. Thus, animals acclimated to high tem- peratures are less size-dependent. The Q10 values increase as weight increases over the range from 5° to 10° C. Comparison of a small
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