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Fig. 6. Relationship between urine flow rate and (A) glomerular filtration rate and (B) the fractional reabsorption of water in freshwater (open symbols) and saline-acclimated (filled symbols) mallards Anas platyrhynchos (circles), canvasbacks Aythya valisineria (triangles) and Barrow's goldeneyes Bucephala islandica (squares).