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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第74巻 第1号 >
オニクマムシMilnesium tardigradumの樽化から復帰に至る過程で取り込まれた気泡の役割
| Title: | オニクマムシMilnesium tardigradumの樽化から復帰に至る過程で取り込まれた気泡の役割 |
| Other Titles: | Function of Bubble for Recovery from Cryptobiosis in Tardigrade Milnesium tardigradum |
| Authors: | 伊勢, 昌宏1 Browse this author | | 中谷, 敏邦2 Browse this author →KAKEN DB | | 石原, 千晶3 Browse this author →KAKEN DB |
| Authors(alt): | Ise, Masahiro1 | | Nakatani, Toshikuni2 | | Yasuda, Chiaki I.3 |
| Keywords: | Tardigrade | | Milnesium tardigradum | | Cryptobiosis | | Bubbles | | Recovery |
| Issue Date: | 4-Aug-2024 |
| Publisher: | 北海道大学大学院水産科学研究院 |
| Journal Title: | 北海道大学水産科学研究彙報 |
| Journal Title(alt): | Bulletin of Fisheries Sciences, Hokkaido University |
| Volume: | 74 |
| Issue: | 1 |
| Start Page: | 1 |
| End Page: | 11 |
| Abstract: | Tardigrades enter a cryptobiotic state (barrel-shaped form) to persist in extreme environments, but there are few experimental observations to examine how complete recovery from this state occurs. Here, we directly observed the tardigrade Milnesium tardigradum in the cryptobiotic and active states under the microscope with a video system. Rates of complete recovery of cryptobiotic organisms with or without cover glasses were 71.4% and 73.3%, respectively, suggesting no effect of the cover glass on the recovery success in this species. More than 50% of organisms showed bubbles in the mouth canal during the recovery process regardless of the recovery success. Since these bubbles disappeared just before the recovery at the end of the mouth canal, but did not flow into the pharynx, bubbles might flow into the body cavity and regulate the intracorporeal pressure during recovery. Bubbles were also observed in the mouth canal of active organisms entering the cryptobiotic state. Bubbles therefore occurred in both cryptobiotic-to-recovery and active-to-cryptobiotic processes. The end of the mouth canal in M. tardigradum might function as a barrier between the external and internal environment and contribute to the regulation of hydrostatic pressure in the body cavity. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/92921 |
| Appears in Collections: | 北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第74巻 第1号
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