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Short-Term Responses of the Adults of the Common Japanese Intertidal Crab, Hemigrapsus Takanoi (Decapoda: Brachyura: Grapsoidea) at Different Salinities: Osmoregulation, Oxygen Consumption, and Ammonia Excretion

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Abstract Intermolt to premolt males of Hemigrapsus takanoi were exposed to salinities of 0, 10, 20 (control), 30, and 40 ppt. After 2, 4, and 6 h of exposure, oxygen consumption and ammonia excretion were measured. Hemolymph osmolality was measured at the end of 8 h. No mortalities were observed until hemolymph sampling. Hemolymph osmolality was maintained between 570 to 840 mmol/kg. Oxygen consumption increased significantly only at 0 ppt, compared to the control (20 ppt). Ammonia excretion levels showed a remarkable increase at 0 ppt. These results indicate that this species expends increased metabolic effort to tolerate abrupt salinity changes to freshwater compared to brackish or seawater.

Affiliations: 1: a (JS) Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, the University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan ; 2: b (CAS and SW, correspondence) Department of Marine Biosciences, Faculty of Marine Science, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato, Tokyo, 108-8477, Japan ( ; 3: c (MNW) Japan International Research Center for Agricultural Sciences, 1-1 Owashi, Tsukuba, Ibaraki, 305-8686, Japan


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