Hypoosmotic volume regulation in the sea anemone metridium senile |
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| Institution: | 1. Marine Fishery Environment and Bioremediation Laboratory, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;2. Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China;2. Department of Neurology, Inje University Ilsan Paik Hospital, Goyang, South Korea;3. Department of Neurology, Eulji General Hospital, Seoul, South Korea;4. Department of Neurology, Chung-Ang University Hospital, Seoul, South Korea;6. Department of Neurology, Soonchunhyang University Hospital, Seoul, South Korea;5. Department of Neurology, Eulji University Hospital, Daejeon, Republic Korea;11. Department of Biostatistics, Korea University, Seoul, South Korea;12. Health Insurance Review and Assessment Service, Wonju, South Korea;8. Department of Medicine, University of Toronto, Toronto, Ontario, Canada;10. St. Michael''s Hospital, Toronto, Ontario, Canada |
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| Abstract: | 1. The anemone Metridium senile survives salinities from seawater (950 mOsm) to 55% SW (520 mOsm) for at least two weeks. Animals exposed to 40% SW (380 mOsm) die within three days.2. The tissue amino acid content of M. senile acclimated to 950 mOsm, 807 mOsm, 665 mOsm and 520 mOsm for two weeks is respectively, 444, 382, 331 and 251 μmol/g dry wt. A decrease in the concentration of taurine accounts for nearly all of the decrease in the free amino acid pool.3. Tissue hydration increases in M. senile acclimated to dilute seawater, but the increase was not proportional to the change in ambient salinity, indicating that the anemones partially regulate volume in dilute media.4. Mathematical analyses of changes in tissue hydration as a function of ambient salinity in M. senile, Haliplanella lineata, and Diadumene leucolena suggest that the effectiveness of volume regulation increases in individuals of these species acclimated to progressively more dilute media. The volume regulatory capability of Bunodosoma cavernata does not change in dilute media. |
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