Effect of oxygen and salt on haemolymph oxygen binding in the brine shrimpArtemia franciscana

✍ Scribed by B. Wachter; J. Abbeele; G. Wolf

• Book ID: 104734417
• Publisher: Springer-Verlag
• Year: 1994
• Tongue: English
• Weight: 729 KB
• Volume: 118
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00349793

✦ Synopsis

The oxygen-binding properties of haemolymph from laboratory-reared Artemiafranciscana were investigated in vitro. Adult female brine shrimp without eggs were acclimated to seven different combinations of salinity and oxygen. The oxygen affinity (Pso) of unprocessed haemolymph rises with acclimation oxygen partial pressure (PO2) up to normoxic values, after which no influence of oxygen occurs. The increase in Ps0 with acclimation PO 2 can be explained by the change in proportion of each of three different haemoglobins in the haemolymph. Salinity acclimation has no effect on haemolymph Pso-The effects of the different major salts [NaNO3, NaC1, Ca(NO3)2, Mg(NO3)2], pH, and the metal-binding ligand EGTA on the oxygen-binding properties of buffered haemolymph (of shrimp acclimated to 10 %0 salinity) were also studied. Little or no effect of these salts could be found. A small Bohr effect (pH 6.5 to 9.1, ~b = -0.11) was noted. Addition of EGTA caused a significant decrease of the oxygen affinity at concentrations up to 50 mmol 1-'.