Hummingbirds arrest their kidneys at night: diel variation in glomerular filtration rate in Selasphorus platycercus.

  title={Hummingbirds arrest their kidneys at night: diel variation in glomerular filtration rate in Selasphorus platycercus.},
  author={Bradley Hartman Bakken and Todd J McWhorter and Ella Tsahar and Carlos Mart{\'i}nez del Rio},
  journal={The Journal of experimental biology},
  volume={207 Pt 25},
Small nectarivorous vertebrates face a quandary. When feeding, they must eliminate prodigious quantities of water; however, when they are not feeding, they are susceptible to dehydration. We examined the role of the kidney in the resolution of this osmoregulatory dilemma. Broad-tailed hummingbirds (Selasphorus platycercus) displayed diurnal variation in glomerular filtration rate (GFR). During the morning, midday and evening, GFRs were 0.9+/-0.6, 1.8+/-0.4 and 2.3+/-0.5 ml h(-1), respectively… CONTINUE READING

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