. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 230 HENRY O. WERNTZ the fresh-water G. jasciatus. The experiments were carried out at approximately 15° C. RESULTS Osmoregulatory behavior The four species regulated osmotically in the manner shown in Figure 1. Each point is the mean of determinations on several animals (see methods section). The vertical lines at each point give ±2 X the standard error of the mean, or the 95% confidence interval for the mean. O GAMMARUS OCEANICUS • GAMMARUS FASCIATUS O?. 0 OSMOTIC CONCENTRATION OF MEDIUM, M/KG FIGURE 2.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 230 HENRY O. WERNTZ the fresh-water G. jasciatus. The experiments were carried out at approximately 15° C. RESULTS Osmoregulatory behavior The four species regulated osmotically in the manner shown in Figure 1. Each point is the mean of determinations on several animals (see methods section). The vertical lines at each point give ±2 X the standard error of the mean, or the 95% confidence interval for the mean. O GAMMARUS OCEANICUS • GAMMARUS FASCIATUS O?. 0 OSMOTIC CONCENTRATION OF MEDIUM, M/KG FIGURE 2. Relationship of rate of urine flow to external concentration in Gammarus oceanicus (marine) and G. jasciatus (fresh-water). Points represent individual animals. Points marked with a question mark are not included in the statistics. Curves connect the means. Vertical lines show ±2 X the standard errors. The marine species (M. finmarchicus and G. oceanicus) exhibited nearly iden- tical relationships of blood concentration to external concentration. In full strength sea water their blood was nearly isotonic to the medium. They began to regulate the blood concentration when sea water was diluted only slightly to below molal. As the medium was further diluted, they maintained a progressively greater concentration gradient, and in molal sea water the blood concentration was still molal. In the most dilute sea-water media the gradient failed to increase fur- ther, or even decreased, but all animals in molal sea water survived. In fresh water all M. finmarchicus died, but three out of ten G. oceanicus survived 24 hours,. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-195
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
