Abstract
Abstract Various inorganic ions were measured from the haemolymph of Palaemon longirostns (Milne Edwards) acclimated to a wide range of salinities at 4,12 and 20°C. At each temperature, P. longirostris showed strong hyper-hypo-regulation of sodium, chloride and potassium in salinities ranging from 0.5 to 43\%0. Calcium and magnesium ions were also strongly regulated over this salinity range, however, whereas calcium was consistently higher in the blood than in the external medium, blood magnesium concentrations were always maintained lower than in the external medium. Effect of temperature on ionic regulation was not consistent. Sodium regulation was unaffected by temperature, whereas high temperature (20°C) caused an increase in blood potassium concentration and low temperature (4°C) resulted in an increase in blood chloride, calcium and magnesium concentrations. Concentrations of sodium, chloride, potassium, calcium and magnesium ions in the blood of P. longirostris were estimated to account for > 90% of total blood osmolality at each salinity.
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