. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYSIOLOGICAL ECOLOGY AND BEHAVIOR 237. Figure 1. Longitudinal section of the sea anemone Haliplanella luciae fixed 4 h after feeding to satiation with Artemia salina nauplii labeled with Evans blue. The arrowheads indicate the regions adjacent it i lite tilameius where endocytosis almost exclusively occurred. The scale bar represents I mm absorb yeast cells or other particles in Haliplanella. Apparently in intact Haliplanella, all yeast cells ingested are trapped in the pharyngal mucus and therefore might not b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYSIOLOGICAL ECOLOGY AND BEHAVIOR 237. Figure 1. Longitudinal section of the sea anemone Haliplanella luciae fixed 4 h after feeding to satiation with Artemia salina nauplii labeled with Evans blue. The arrowheads indicate the regions adjacent it i lite tilameius where endocytosis almost exclusively occurred. The scale bar represents I mm absorb yeast cells or other particles in Haliplanella. Apparently in intact Haliplanella, all yeast cells ingested are trapped in the pharyngal mucus and therefore might not be available to the column wall cells. On the other hand, a small fraction of the artificial food India ink passed the pharynx without being trapped and was then absorbed in the whole gastrodermis as previously observed in other species (2). The differential affinities of yeast and India ink for mucus are currently under investigation. For macrophagous feeding. Anemia salina nauplii were co- valently labeled with the dyes Texas red sulfonyl chloride and fluorescein isothiocyanate, or non-covalently labeled with Evans blue (7). The flexible mesenteries formed tight sacs around all ingested nauplii as observed previously (8. 9). These food sacs were further wrapped with mucus as shown by mucicarmine staining. During extracellular digestion of the wrapped food, very little of the three dyes could be detected in the gastric cavity in all ten tested anemones, which indicated that paniculate food fragments as well as soluble constituents ( the water-soluble dye Evans blue) were almost completely trapped in the mes- enterial sacs. Hence, no mixing of the digestive juices occurred within the gastric cavity. This explains why very little digestive enzymes were previously detected in the gastric cavity during digestion (9, 10). Endocytosis took place almost exclusively in the mesenterial regions directly adjacent to the filaments, even when the animals were fed to satiation (Fig. 1).
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
