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Fig. 4. Glomerular filtration rates (GFR) in broad-tailed hummingbirds before, during and after a ~1.5 h food/water deprivation episode. During food/water removal, mean GFR was significantly reduced relative to the pre-removal period (GFR'FAST and GFRMIDDAY were equal to 0.9±0.5 and 1.8±0.4 ml h–1, respectively; N=9). When we returned the food/water, GFRRETURNED (1.4±1.0 ml h–1; N=9) was not different from either GFRMIDDAY or GFR'FAST. GFRPREDICTED is equal to 2.1 ml h–1 (Bennett and Hughes, 2003).





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