Ammonia excretion by hummingbirds

  title={Ammonia excretion by hummingbirds},
  author={M. Preest and C. Beuchat},
Ammonotely in a neotropical frugivorous bat as energy intake decreases.
By favoring ammonia production over urea, bats on the energy-poor diet may save up to 1% of their basal metabolic rate, which is inversely related to energy intake, but they were not related to N intake. Expand
Can birds be ammonotelic? Nitrogen balance and excretion in two frugivores
Two non-exclusive mechanisms for the post-renal modification of urine in these birds are suggested: bacterial catabolism of uric acid and reabsorption of Uric acid in the hindgut and birds might benefit from its re absorption. Expand
Are Hummingbirds Facultatively Ammonotelic? Nitrogen Excretion and Requirements as a Function of Body Size
The results support the hypothesis that nectar‐feeding birds have low protein requirements but cast doubt on the notion that they are facultatively ammonotelic, and hint at a possible size‐dependent dichotomy in hummingbirds. Expand
Ammonotely in a passerine nectarivore: the influence of renal and post-renal modification on nitrogenous waste product excretion.
It is suggested that ammonotely may not be a unique feature of nectarivorous birds and could occur in any species in which breakdown of urate in the hindgut allows the uric acid-nitrogen concentration in the excreta to fall below that of the ammonia-Nitrogen concentration. Expand
The Influence of Ambient Temperature and the Energy and Protein Content of Food on Nitrogenous Excretion in the Egyptian Fruit Bat (Rousettus aegyptiacus)
Both the absolute quantity and the fraction of ammonia in the bats’ urine increased significantly with food intake and food intake decreased exponentially with increasing sucrose concentration. Expand
Comparative Physiology of the Vertebrate Kidney
1. Introduction.- 1.1 The Comparative Approach.- 1.2 Environmental Requirements in Regulating the Water and Solute Composition of the Internal Environment.- 1.3 Possible Roles of Kidneys inExpand
Transport of Organic Substances by Renal Tubules
The excretion of numerous organic substances is regulated by renal tubular transport. For a few of these substances, enough information is now available on the transport processes in nonmammalianExpand
Osmoregulatory Systems of Birds
Birds that consume prey that are high in salt content or that take in fluids high in salinity have functional salt glands that are capable of eliminating excess ions, usually sodium chloride, and in the process produce free water. Expand
Osmoregulation and excretion.
How knowledge in these areas of comparative physiology has expanded considerably during the last two decades is demonstrated, bridging seminal classical works with studies based on new approaches at all levels of anatomical and functional organization. Expand


Nitrogen Metabolism and Excretion
Protein Turnover in Animals, D.F. Wright and D.A. Wright Uptake and Effects of Nitrite and Nitrate in animals, F.B.D. Dantzler Urea Synthesis in Mammals, A.J. Meijer Urea and Ammonium Transport in the Mammalian Kidney, M.M. Expand
The Integration of Osmoregulation and Energy Balance in Hummingbirds
The hummingbird is a unique animal: its kidney appears to be structurally similar to that of a reptile, but its rate of waterflux is more typical of an amphibian; it sustains a metabolic level as high as that of any endotherm. Expand
Nitrogen Excretion by Turkey Vultures
Investigation of nitrogen excretion in a carnivorous species, the Turkey Vulture, found an adaptive increase in the percentage of urinary N excreted as urate and a decrease in NH3-N and urea-N in the period after feeding on meat, which increases the efficiency of N excretion. Expand
On the temperature-dependency of optimal nectar concentrations for birds.
  • W. Calder
  • Biology, Medicine
  • Journal of theoretical biology
  • 1979
Hypothetically, flowers which have coevolved with pollination by hummingbirds could provide both energy and water balance simultaneously if they produced nectars of appropriate concentrations which depend upon environmental temperature. Expand
The effects of dietary protein content on water requirements and ammonia excertion in pigeons,Columbia livia
Abstract 1. Ad lib. drinking rates, minimum water requirements, and the rates of urine flow and ammonia excertion in the pigeon vary directly with the dietary protein content. 2. Increased dietaryExpand
The renal excretion of nitrogenous compounds by the duck (Anas platyrhynchos) maintained on freshwater and on hypertonic saline.
The urea:inulin clearance ratios for the individual urine samples from all birds suggested that renal tubular synthesis and secretion of urea may occur and may be interpreted as a reliable measure of the renal plasma flow rate. Expand
Oxygen Consumption of Torpid, Resting, Active, and Flying Hummingbirds
This investigation was supported, in part, by grant G-9238 from the National Science Foundation to Dr. W. R. Dawson, and by funds from the Graduate Student Research Fund, Horace H. Rackham School of Graduate Studies, University of Michigan. Expand
Nitrogenous excretion in Chelonian reptiles.
  • V. Moyle
  • Biology, Medicine
  • The Biochemical journal
  • 1949
Bates, R. W. (1937). J. biol. Chem. 119, vii. Bawden, F. C. & Kleczkowski, A. (1941). Brit. J. exp. Path. 22, 208. Bawden, F. C. & Kleczkowski, A. (1942a). Brit. J. exp. Path. 23, 169. Bawden, F. C.Expand