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Osmo-ionic regulation in the Brazilian ghost crab Ocypode quadrata (Fabricius, 1787) (Crustacea, Brachyura)
Santos, M.C.F.; Moreira, G.S.; Brotto, R.O. (1989). Osmo-ionic regulation in the Brazilian ghost crab Ocypode quadrata (Fabricius, 1787) (Crustacea, Brachyura), in: Ros, J.D. (Ed.) Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3): pp. 691-694
In: Ros, J.D. (Ed.) (1989). Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3). Instituto de Ciencias del Mar: Barcelona. 145-754 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Peer reviewed article  

Available in Authors 
    VLIZ: Proceedings [16980]
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Santos, M.C.F.
  • Moreira, G.S.
  • Brotto, R.O.

Abstract
    The effects of salinity on haemolymph osmotic, Ca2+, K+ Mg2+ and Na+ regulation in the Brazilian Ocypode quadrata were investigated. The species is a strong hyper-regulator in freshwater or low salinities, while at high salinities it is a hypo-regulator. The iso-osmotic and iso-ionic points are around 27 salinity, except for haemolymph Mg2+, which is around 8 salinity. There is a significant rise in the osmotic concentration during the exposure to freshwater, which coincides with a rise in the Ca2+, but not in the Na+ concentration. The haemolymph K+ and Mg2+ concentrations are well regulated in all experimental salinities. These results were compared with those reported early for the northern hemisphere Ocypode quadrata population, which seems to be more adapted to high salinity waters than is the Guaecá population.

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