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Effects of fluctuating salinity on the behaviour of the West African blood clamAnadara senilisand on the osmotic pressure and lonic concentrations of the haemolymph

✍ Scribed by J. S. Djangmah; S. E. Shumway; J. Davenport

Publisher: Springer-Verlag
Year: 1979
Tongue: English
Weight: 381 KB
Volume: 50
Category: Article
ISSN: 0025-3162
DOI: 10.1007/bf00394202

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✦ Synopsis

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 Mg 2+ 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.

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