. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 13- 12- 11 - lo- g- s' 7- 6- 5 4 (B) 6 meals/week. 012345 nauplii consumed per meal Figure 3. Mean masses of buds produced by green (D) and aposym- biotic (O) hydra during 21 days at various steady state feeding levels for hydra fed three times (A) and six times weekly (B). Least squares regressions (shown) yielded R2 values of and for green hydra fed three times and six times weekly, respectively, and and for aposymbionts fed three times and six times weekly, respectively. els (Fig. 4b), and the benefit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 13- 12- 11 - lo- g- s' 7- 6- 5 4 (B) 6 meals/week. 012345 nauplii consumed per meal Figure 3. Mean masses of buds produced by green (D) and aposym- biotic (O) hydra during 21 days at various steady state feeding levels for hydra fed three times (A) and six times weekly (B). Least squares regressions (shown) yielded R2 values of and for green hydra fed three times and six times weekly, respectively, and and for aposymbionts fed three times and six times weekly, respectively. els (Fig. 4b), and the benefit increased as food level in- creased (slopes differ significantly. P < .05, ANCOVA). For hydra fed every other day (Fig. 4a), green hydra pro- duced more animal tissue than did aposymbionts (P .25, ANCOVA). There is no evidence at ei- ther feeding frequency that the contribution of algae to host tissue production increases as host food level de- creases. The effect of host feeding on algal photosynthesis The rates of photosynthesis and of respiration were measured as a function of time after feeding for hydra consuming either one or two Anemia nauplii apiece. For each sample, the rate of gross photosynthesis was derived by subtracting the rate of oxygen depletion in the dark (due to respiration) from the rate of oxygen depletion in the light (due to the combination of respiration and pho- tosynthesis). As shown in Figure 5, feeding appeared to have little effect on either the photosynthetic rates or the o O) u> o ro T3. 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 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
