...Scott A. Carleton; Bradley Hartman Bakken; Carlos Martínez del Rio SUMMARY We fed broad-tailed hummingbirds ( Selasphorus platycercus ) diets of contrasting carbon isotope composition and measured changes in theδ 13 C of expired breath through time. By measuring theδ 13 C in the breath of fed...

... 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. At midday, GFR increased...

..., USA 27 07 1999 30 09 1999 © 1999 by Company of Biologists 1999 hummingbird Selasphorus platycercus food ingestion water turnover diet osmoregulation nectar A perpetual challenge facing terrestrial animals is the maintenance of fluid and electrolyte balance...

... Veterinary College, Royal College Street, London NW1 0TU, United Kingdom. 28 01 1993 © 1993 by Company of Biologists 1993 aerodynamics flight hummingbird muscle power Selasphorus platycercus Selasphorus rufus Hovering flight has been described as the most...