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Fig. 7. Despite the overall trend (Fig. 4), broad-tailed hummingbirds showed heterogeneous responses to food/water deprivation. Values associated with each regression line are glomerular filtration rate (GFR; ml h–1) estimates. Solid regression lines denote estimates obtained using equation 2; broken regression lines denote estimates made using equation 4. Although data of [14C] of excreta are loge-transformed here for clarity, our analyses were performed on non-transformed data (Motulsky and Ransnas, 1987). (A) Data from one representative hummingbird. (B) Data from one hummingbird illustrating that GFR'FAST was not always substantially reduced (~25%). (C) Data from one hummingbird showing a GFR'FAST that was considerably reduced (~90%). The hummingbirds in B and C exhibited a GFRRETURNED greater than GFRMIDDAY.





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