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Journal of Experimental Biology 61,269-276 (1974)
Published by Company of Biologists 1974

Renal Concentrating Ability in Selected West Australian Birds

ERIK SKADHAUGE ¹

¹ Institute of Medical Physiology, Dept. A, University of Copenhagen, and Department of Zoology, University of Western Australia

1. The osmotic ratio between ‘urine’ (the supernatant of the ureteral part of the droppings) and plasma has been determined in a number of dehydrated West Australian birds.

2. The U/P ratio was 1.4 in the Emu, 1.7 in two Columbidae (Senegal Turtle Dove and Crested Pigeon), 2.4 in two Meliphagidae (Singing Honey-eater and Red Wattle Bird), 2.6 in three Psittacidae (Bourke Parrot, 28-Parrot, and Galah), 2.7 in the Laughing Kookaburra, and 2.8 in the Zebra Finch.

3. The Na⁺ and Cl^- concentrations in the ‘urine’ ranged from 5 to 71 m-equiv./l, the K⁺ concentration from 92 to 201 m-equiv./l.

4. There seems to be a rather narrow range for the concentrating ability within each family, but the concentrating ability of xerophilic birds differs considerably.

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