Abstract
1. 1. Glomerular filtration rate was estimated by measurement of cloacal excretion of intramuscularly injected 14C PEG in fresh water and sea water acclimated Mallards, Anas platyrhynchos, Canada Geese, Branta canadensis, and Glaucous-winged Gulls, Larus glaucescens. 2. 2. GFR (ml/min kg) of FW Mallards was 3.3 ± 1.8 (5); FW geese, 1.2 ± 0.1 (2) and FW gulls, 1.9 ± 0.4(4). 3. 3. Acclimation to SW did not affect the GFR of ducks, but increased the GFR of geese, 2.2 ± 0.1 (2) ( P < 0.0005) and gulls, 4,0 ± 0.3 (5) ( P < 0.005).
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