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Fig. 2. Diel variation in glomerular filtration rate (GFR) in broad-tailed hummingbirds. Our GFR estimates for the evening, night and morning were 2.3±0.5, –0.1±0.2 and 0.9±0.6 ml h–1 (N=9), respectively, and were significantly different from each other. GFRMORNING was lower than GFREVENING by a factor of 2.6, and GFR'NIGHT was not different from 0. GFREVENING was approximately 110% of the allometric prediction (GFRPREDICTED=2.1 ml h–1; Bennett and Hughes, 2003).





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