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Fig. 7. Salt gland secretion [Na+] and flow rate in freshwater (open symbols) and saline-acclimated (filled symbols) mallards Anas platyrhynchos (circles), canvasbacks Aythya valisineria (triangles) and Barrow's goldeneyes Bucephala islandica (squares) infused intravenously with 500 mmol l–1 NaCl at 0.175 ml min–1. Values are means ± S.E.M. (N=4 ducks per treatment).