Tigriopus japonicusの消化管における栄養物質の吸収形態

抄録

The absorptive function of the alimentary canal of Tigriopus japonicus was investigated using lipids, saccharated iron oxide, and ferritin as tracers. Light and electron microscopic examinations revealed that nutritive substances were absorbed only in the mid-gut. Lipids were absorbed by the non-vacuolated cells by means of transmembrane absorption and accumulated in lipid vacuoles of the non-vacuolated cells and lipid storing tissues of the body. Positive Berlin blue reaction by absorbed iron was found in all the mid-gut epithelial cells. Ferritin was absorbed only by the vacuolated cells by means of endocytosis. These tracer substances were found to be absorbed more actively in the mid-gut in the metasome than that in the urosome. These results indicate that there are differences in mode and degree of absorption between the mid-gut in the metasome and that in the urosome.