. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. *•. V' f -J "- 'i& • i'f ' r *> ' 1 - ^ •< v 7 X » Xj*» ..." . - A. M FIGURE 11. Light micrograph of squash of fecal pellet of Pteraeolidea ianlhina showing presumably degenerate and healthy zooxanthellae. ZxD-degenerate zooxanthellae, ZxH-healthy zooxanthellae. Bar = 20 ^m. FIGURES 12-14. Healthy and degenerate zooxanthellae in fecal pellet of Melibe sp. FIGURE 12. Morphologically intact, presumably healthy zooxanthella. Amphiesma is intact and regular, organellar structure is organized, and organelles a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. *•. V' f -J "- 'i& • i'f ' r *> ' 1 - ^ •< v 7 X » Xj*» ..." . - A. M FIGURE 11. Light micrograph of squash of fecal pellet of Pteraeolidea ianlhina showing presumably degenerate and healthy zooxanthellae. ZxD-degenerate zooxanthellae, ZxH-healthy zooxanthellae. Bar = 20 ^m. FIGURES 12-14. Healthy and degenerate zooxanthellae in fecal pellet of Melibe sp. FIGURE 12. Morphologically intact, presumably healthy zooxanthella. Amphiesma is intact and regular, organellar structure is organized, and organelles and components are well denned. A-amphiesma, Ch-chloroplast, St-starch granule. Bar = urn. FIGURE 13. Degenerating zooxanthella. Amphiesma is highly irregular and beginning to break-up. A-amphiesma, DV-dense osmophilic vesicle, GM-granular matrix, St-starch granule. Bar = Mm. FIGURE 14. Probable membranous and granular remains of completely degenerated (digested?) zoox- anthella. Granular matrix is similar to that within algal cell in Figure 13. Note myelin figures like those described by Trench (1974, p. 204) in degrading zooxanthella of Zoanthus sociatus. GM-granular matrix, M-myelin figure. Bar = Translocation of nutrients from symbiont to host The term "translocatiorT has been used in previous work to describe the leakage of fixed carbon from algal symbionts to the host tissues (Muscatine and Hand, 1958; Muscatine, 1967; Taylor, 1969a; Trench, 1971a, b, c;Goreau etai, 1973; and others). The implication is that the mechanism for this leakage is a host-mediated transport or diffusion of fixed carbon across the amphiesma of healthy symbionts (Muscatine, 1967; Trench, 197 la, b, c). The results of starvation experiments carried out in the present study lead one to conclude that a similar mechanism for translocation functions in Melibe pilosa. Upon initial inspection of starvation results, a similar conclusion. Please note that these images are extracted
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
