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Hydromineral regulation in the hydrothermal vent crab Bythograea thermydron.

TitreHydromineral regulation in the hydrothermal vent crab Bythograea thermydron.
Type de publicationJournal Article
Year of Publication2001
AuteursMartinez, A-S, Toullec, J-Y, Shillito, B, Charmantier-Daures, M, Charmantier, G
JournalBiol Bull
Date Published2001 Oct
Mots-clésAnimals, Brachyura, Chlorides, Hemolymph, Pacific Ocean, Sodium, Water-Electrolyte Balance

This study investigates the salinity tolerance and the pattern of osmotic and ionic regulation of Bythograea thermydron Williams, 1980, a brachyuran crab endemic to the deep-sea hydrothermal vent habitat. Salinities of 33 per thousand-35 per thousand were measured in the seawater surrounding the captured specimens. B. thermydron is a marine stenohaline osmoconformer, which tolerates salinities ranging between about 31 per thousand and 42 per thousand. The time of osmotic adaptation after a sudden decrease in external salinity is about 15-24 h, which is relatively short for a brachyuran crab. In the range of tolerable salinities, it exhibits an iso-osmotic regulation, which is not affected by changes in hydrostatic pressure, and an iso-ionic regulation for Na(+) and Cl(-). The hemolymph Ca(2+) concentration is slightly hyper-regulated, K(+) concentration is slightly hyper-hypo-regulated, and Mg(2+) concentration is strongly hypo-regulated. These findings probably reflect a high permeability of the teguments to water and ions. In addition to limited information about salinity around hydrothermal vents, these results lead to the hypothesis that B. thermydron lives in a habitat of stable seawater salinity. The osmoconformity of this species is briefly discussed in relation to its potential phylogeny.

Alternate JournalBiol. Bull.
Identifiant (ID) PubMed11687388