1. Some features of the osmoregulatory mechanism are compared in four populations of Paranephrops zeal andicus White collected form freshwaters of different ionic concentrations. 2. Crayfish from freshwaters of ca, 2-0 mM-NaCl concentration show a sustained decrease in blood concentration of ca. 8% when placed in 0-2 mM-NaCl. 3. Populations from freshwaters of ca. 0-2-0-4 mM-NaCl show lower rates of net salt loss in distilled water and higher rates of net salt uptake form dilute NaCl solutions than do populations from freshwaters of ca. 0-8-2-0 mM-NaCl. 4. Renal salt losses over the first 24 h in distilled water account for ca. 18% of the total salt loss. 5. It is suggested that P. zealandicus from environments of lowest concentration shows a similar degree of adaptation to freshwater as do crayfish of the northern hemisphere. It differs in possessing a substantially higher blood concentration.
Osmotic and ionic regulation in different populations of the new zealand freshwater crayfish Paranephrops zealandicus
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T. M. Wong, R. F. Freeman; Osmotic and ionic regulation in different populations of the new zealand freshwater crayfish Paranephrops zealandicus. J Exp Biol 1 June 1976; 64 (3): 645–663. doi: https://doi.org/10.1242/jeb.64.3.645
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