Fig. 4. Effect of hypotonic and hypertonic saline infusion (75 and 500 mmol l^–1 NaCl, respectively) on (A) effective renal plasma flow (ERPF), (B) glomerular flow rate (GFR) and (C) urine flow rate (UFR) in freshwater (open symbols) and saline-acclimated (filled symbols) mallards Anas platyrhynchos (circles), canvasbacks Aythya valisineria (triangles) and Barrow's goldeneyes Bucephala islandica (squares). The period of 500 mmol l^–1 NaCl infusion was subdivided into two parts: the period prior to secretion (–) and the period of secretion (+). Values are means ± S.E.M. (N=4 ducks per treatment).

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