. The Biological bulletin. Biology; Zoology; Marine biology. 426 John c. Cornell. 10 HOURS IN 80% SW Figure 1. Changes in D20 water exchange rates in specimens of Libinia cinarginata and Carcinus maenas transferred from 100 to 80% SW, expressed as k in (1/hr), the hourly water exchange fraction. For specimens of Libinia, the results from two experiments are shown: the first, is indicated by the solid circles (average weight of crabs, 168 g) ; the second, is indicated by the open circles (220 g). For specimens of Carcinus, the results are indicated by the open squares (22 g). I have calculated
. The Biological bulletin. Biology; Zoology; Marine biology. 426 John c. Cornell. 10 HOURS IN 80% SW Figure 1. Changes in D20 water exchange rates in specimens of Libinia cinarginata and Carcinus maenas transferred from 100 to 80% SW, expressed as k in (1/hr), the hourly water exchange fraction. For specimens of Libinia, the results from two experiments are shown: the first, is indicated by the solid circles (average weight of crabs, 168 g) ; the second, is indicated by the open circles (220 g). For specimens of Carcinus, the results are indicated by the open squares (22 g). I have calculated Lp* for specimens of Pugettia during the first several hours after transfer to 80% SW. The calculations suggest that there is a reduction in Lp* of about 60% during the first hour; however, this may be an artifact. The calculations, based on measurements which have relatively large variances (weight gain, urine production, and the osmotic gradient, Cornell, 1976), become increasingly sensitive with time to errors in measurement. Since a plot of the logarithm of the osmotic gradient between the blood and the medium versus time is not significantly curvilinear, a large reduction seems unlikely. Perhaps the safest conclusion is that the data are inadequate to indicate whether or not a short-term change in Lp* occurs. Etimates oj k The results of two experiments in which specimens of Libinia were transferred from 100 to 80% SW are shown in Figure 1. For practical reasons, the points at time 0 were actually determined 24 hr prior to the transfer of animals to 80% SW. In the first experiment, k in (1/hr) was for animals in SW and for the same group after one hour in 80% SW, a reduction of 30% (P < , paired i-test). The second experiment is similar to the first, but was carried out for a longer period of time. In this experiment, k, measured after one hour of. Please note that these images are extracted from scanned page images that may have been digitally enhanced f
Size: 1888px × 1324px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
