Ammonia excretion by hummingbirds

@article{Preest1997AmmoniaEB,
  title={Ammonia excretion by hummingbirds},
  author={Marion R. Preest and Carol A. Beuchat},
  journal={Nature},
  year={1997},
  volume={386},
  pages={561-562}
}

Ammonotely in a neotropical frugivorous bat as energy intake decreases.

TLDR
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.

Can birds be ammonotelic? Nitrogen balance and excretion in two frugivores

TLDR
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.

Are Hummingbirds Facultatively Ammonotelic? Nitrogen Excretion and Requirements as a Function of Body Size

TLDR
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.

Ammonotely in a passerine nectarivore: the influence of renal and post-renal modification on nitrogenous waste product excretion.

TLDR
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.

The Influence of Ambient Temperature and the Energy and Protein Content of Food on Nitrogenous Excretion in the Egyptian Fruit Bat (Rousettus aegyptiacus)

TLDR
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.

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 nonmammalian

Comparative Physiology of the Vertebrate Kidney

  • W. Dantzler
  • Biology, Environmental Science
    Springer New York
  • 2016
TLDR
The Comparative Approach helps clarify the role of kidneys in Regulating the Water and Solute Composition of the Internal Environment and provides a framework for future studies of Renal Morphology.

Osmoregulatory Systems of Birds

Osmoregulation and excretion.

TLDR
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.

STUDIES ON DIETARY PROTEIN UTILIZATION IN JAPANESE QUAIL

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