caa a22 4500 469082321 CHVBK 20180323132954.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF00318689 doi (NATIONALLICENCE)springer-10.1007/BF00318689 Salinity tolerance and structure of external and internal gills in tadpoles of the crab-eating frog, Rana cancrivora [Elektronische Daten] [Minoru Uchiyama, Hideki Yoshizawa] Summary: Salinity tolerance and histology of gills were studied in Rana cancrivora larvae. The tadpoles at the external gill stages (W stages 21-22) were able to survive in media containing up to 40% seawater, but died in water of higher salinity. Their external gills appear to have no critical role in adaptation to seawater. However, advanced tadpoles with internal gills (T-K stages I-XVIII) were able to tolerate 50% or higher seawater. In the internal gills, there are numerous mitochondriarich cells (MR cells) scattered on the ventral and lateral epithelia of the gill arches and the gill tufts in both freshwater-and seawater-acclimated tadpoles. In freshwater-acclimated tadpoles there are three types of MR cell: (1) microplicated, (2) microvillous, and (3) apically vacuolated. In tadpoles acclimated to dilute seawater, the ratio of type-1 to type-2 cells is lower, although all three types of MR cell are present. In 60%-seawater-acclimated tadpoles, a few MR cells with a lumen and concave cytoplasm at the apical membrane (type 4) are present. The changes in MR cell morphology under ambient conditions of low or high salinity may reflect alterations in the physiological roles of the gills with regard to transport of ions. Springer-Verlag, 1992 Osmotic stress nationallicence Gills nationallicence Mitochondria-rich cells nationallicence Polymorphic cell nationallicence Rana cancrivora (Anura) nationallicence Uchiyama Minoru Department of Oral Physiology, School of Dentistry at Niigata, The Nippon Dental University, 1-8 Hamaura-cho, 951, Niigata, Japan aut Yoshizawa Hideki Department of Oral Histology, Matsumoto Dental College, 399-07, Shiojiri, Japan aut Cell and Tissue Research Springer-Verlag 267/1(1992-01-01), 35-44 0302-766X 267:1<35 1992 267 441 https://doi.org/10.1007/BF00318689 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00318689 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Uchiyama Minoru Department of Oral Physiology, School of Dentistry at Niigata, The Nippon Dental University, 1-8 Hamaura-cho, 951, Niigata, Japan aut NATIONALLICENCE 700 1- Yoshizawa Hideki Department of Oral Histology, Matsumoto Dental College, 399-07, Shiojiri, Japan aut NATIONALLICENCE 773 0- Cell and Tissue Research Springer-Verlag 267/1(1992-01-01), 35-44 0302-766X 267:1<35 1992 267 441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer