Osmoregulatoryability of Chiromantesortmanni (crosnier, 1965) Subjected to Diluteand Hypersaline Seawater By
نویسنده
چکیده
The short-term osmoregulatory ability and salinity tolerance of Chiromantes ortmanni was studied in the laboratory.C. ortmanni is a non-burrowing, high shore mangrove crab often subjected to extreme salinity uctuations. They were found to be exceptional osmoregulators in salinities ranging from0‰ to 65‰ after threedays. They could also osmoregulate in 80‰ for at least 24 hours, but 96‰ proved to be lethal after just 12 hours. Osmotic capacity suggests that they are best suited for salinities ranging from about 16‰ to 48‰. As they are frequently found in salinities higher than this, it is hypothesized that they tolerate the higher energetic costs of large osmotic gradients as a trade-off for other bene ts such as reduced predation and food competition.
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