. Animal aggregations, a study in general Animal ecology. I go ANIMAL AGGREGATIONS 2 00 180 160 140 120. 100 Fig. 1$.—Showing the total oxj^gen con- sumption of isolated (solid line) and bunched starfish (broken lines) in the different fifths of the starvation experiments. The heavy broken line gives the mean of the two bunches shown by the lighter lines. Each space on the ordinates represents i cc. of oxygen. ing; hence, in the later stages of the tests we are comparing the mean rates of the most hardy of the isolated individu- als with that of a large bunched group that has been
. Animal aggregations, a study in general Animal ecology. I go ANIMAL AGGREGATIONS 2 00 180 160 140 120. 100 Fig. 1$.—Showing the total oxj^gen con- sumption of isolated (solid line) and bunched starfish (broken lines) in the different fifths of the starvation experiments. The heavy broken line gives the mean of the two bunches shown by the lighter lines. Each space on the ordinates represents i cc. of oxygen. ing; hence, in the later stages of the tests we are comparing the mean rates of the most hardy of the isolated individu- als with that of a large bunched group that has been subjected to less rigid selection. When the differential autot- omy is considered in connec- tion with oxygen consumption, it is found that the effect of isolation is much more marked than when only means of sur- vivors are compared. These re- lations are shown in Figure 15, which gives the total oxygen consumed, corrected for weight of the different animal groups. Again the initial value is that which would have been con- sumed had the initial rate held for a period equaling the others shown. It is added only for the purpose of graphic comparison. The preceding types of analysis showed that after the initial period the rate of oxygen con- sumption remained approxi- mately constant at their re- spective levels for both bunched and isolated individuals. On the other hand, the complete data show a decided falling-off in oxygen consumption near the end of the experiments, due to the decrease in numbers of ani- mals present. The effect of the. 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 Allee, W. C. (Warder Clyde), 1885-1955. Chicago : The University of Chicago Press
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