Effects of fluctuating salinity on the behaviour of the West African blood clam Anadara senilis and on the osmotic pressure and lonic concentrations of the haemolymph
- 107 Downloads
Specimens of the West African blood clam Anadara senilis were exposed to both sinusoidal and abrupt salinity regimes. Measurements showed that haemolymph osmolality and concentrations of Na, K+, Ca2+ and Mg2+ followed the concentrations of the external medium up to the time of shell valve closure. Shell valves closed when the seawater concentration had fallen to about 15.4% S and reopened at a similar salinity. The closure mechanism was effective in preventing excessive haemolymph dilution.
KeywordsOsmotic Pressure External Medium Valve Closure Salinity Regime Closure Mechanism
Unable to display preview. Download preview PDF.
- Davenport, J., Ll. D. Gruffydd and A.R. Beaumont: An apparatus to supply water of fluctuating salinity and its use in a study of the salinity tolerance of larvae of the scallop Pecten maximus L. J. mar. biol. Ass. U.K. 55, 391–409 (1975)Google Scholar
- Holyeaux, J., R. Gilles and C. Jeuniaux: Osmotic regulation in molluscs of the intertidal zone. Comp. Biochem. Physiol. 53A, 361–365 (1976)Google Scholar
- Perkin-Elmer: Analytical methods for atomic absorption spectrophotometry, p. EN-1. Norwich, Connecticut, USA: Perkin Elmer 1973Google Scholar
- Pierce, S.K.: The water balance of Modiolus (Mollusca: Bivalvia: Mytilidae): osmotic concentrations in changing salinities. Comp. Biochem. Physiol. 36, 521–533 (1970)Google Scholar
- Shumway, S.E.: Effect of salinity fluctuation on the osmotic pressure and Na+, Ca2+ and Mg2+ ion concentrations in the haemolymph of bivalve molluscs. Mar. Biol. 41, 153–177 (1977)Google Scholar
- Spaargaren, D.H.: A study on the adaptation of marine organisms to changing salinities with special reference to the shore crab Carcinus maenas L. Comp. Biochem. Physiol. 47A, 499–512 (1974)Google Scholar