. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 218 B. AUBREY SCHNEIDER per cent. Comparing these percentages we find the following differences: (a) vs. (b), ± per cent ( X P. E.) ; (a) vs. (c), ± per cent; ( X P. E.) ; and (b) vs. (c), ± per cent ( X P- E.). Only one of these differences is statisti- cally significant; that existing between groups (a) and (c). Clearly something in addition to chance fluctuation caused the heavier mortality in group (c). In all probability, it was the larval density factor which was responsib
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 218 B. AUBREY SCHNEIDER per cent. Comparing these percentages we find the following differences: (a) vs. (b), ± per cent ( X P. E.) ; (a) vs. (c), ± per cent; ( X P. E.) ; and (b) vs. (c), ± per cent ( X P- E.). Only one of these differences is statisti- cally significant; that existing between groups (a) and (c). Clearly something in addition to chance fluctuation caused the heavier mortality in group (c). In all probability, it was the larval density factor which was responsible for this effect. The difference between (a) and (b) ( X P- E.) is a borderline case of significance, and hence cannot be considered a real difference. The difference between (b) and (c) is 40 § 1C I X I 10 Denut,lot ntltjiol 0«n.,t,(c). 24 26 W SO X 34 36 98 40 42 44 46 48 50 92 54 96 58 60 62 64 66 TIME IN DAYS AFTER HATCHING FIG. 3. Frequency distribution of length of larval period for various larval population densities. clearly not significant. These observations on the density factor as related to larval mortality are also in accord with those of Park (1938). It is easy to understand the differences that exist between densities (a) and (c), since there are three times as many larvae per unit of environment in (c) as there are in (a). However, the differences be- tween (a) and (b} are more difficult to fathom in view of the fact that the two had the same population density per unit of environment. The only difference lay in the size of the total populations; one was made up of 10 larvae in 10 grams of flour, the other of 100 larvae in 100 gram?. 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. ).
Size: 1147px × 2180px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
