. The Biological bulletin. Biology; Zoology; Marine biology. 242 LOUIS R. D'ABRAMO Results Particles Two types of particles were used as food in all media. It was important, there- fore, to determine their size distribution. Although formulated separately, starch- protein and lipid-protein particles did not differ in size distribution. Particle size ranged from 2 to 20 /x3 with the majority of particles (80%) in the 2 to 10 range. Because of the similar size distributions it was assumed that there was no different sedimentation rate which could affect the probabilities of ingestion of the
. The Biological bulletin. Biology; Zoology; Marine biology. 242 LOUIS R. D'ABRAMO Results Particles Two types of particles were used as food in all media. It was important, there- fore, to determine their size distribution. Although formulated separately, starch- protein and lipid-protein particles did not differ in size distribution. Particle size ranged from 2 to 20 /x3 with the majority of particles (80%) in the 2 to 10 range. Because of the similar size distributions it was assumed that there was no different sedimentation rate which could affect the probabilities of ingestion of the two types of particles. Effects of dietary fatty acids and temperature on productivity A series of experiments was done to define the effect of varying the quantity and quality of dietary fatty acids at different temperatures. Results of the experi- ments are shown in Figures 1, 2, and 3. Points of graphs represent either a single determination or an arithmetic average of multiple (2â1) determinations of biomass of populations developed on particular diets at selected days of harvest. Points derived from multiple observations include the range of values (vertical bars). Computed regression lines are included. Mortality within populations did not affect productivity determinations since, in most cases, the maximum length of an experimental period never exceeds the life span of Aloina. If mortality was ob- served the population was discarded. 1700 â FAT MIXTURE TYPE â CHL0R0PHYTE 1500- ⢠DIATOM ⢠⢠A 1 / 1300 â iioo- â i 900- // 700- /y 500 . , T .. .. Figure 3. Fatty acid composition dependent temperature effect. Diets containing chloro- phyte and diatom fatty acids at 3 mg%, 30° C and 22° 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Ric
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