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The Water Metabolism of a Small East African Antelope: The Dik-Dik
G. M. O. Maloiy
Proceedings of the Royal Society of London. Series B, Biological Sciences
Vol. 184, No. 1075 (Nov. 27, 1973), pp. 167-178
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/76120
Page Count: 12
You can always find the topics here!Topics: Water loss, Evaporation, Antelopes, Urine, Ungulates, Deserts, Moisture content, Animal physiology, Body temperature, Capsules
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1. In controlled laboratory experiments, rectal temperature, cutaneous moisture evaporation, and respiratory rate were studied in the dik-dik. The water balance of the dik-dik was investigated when the antelope were either fully hydrated or dehydrated at the environmental temperature of 22 degrees C or at temperatures alternating between 22 degrees C and 40 degrees C at 12 h intervals. 2. Faecal, urinary and evaporative water losses were all reduced by varying degrees during dehydration at 22 degrees C and 22 to 40 degrees C. The highest urine osmolality recorded was 4318 ± 105 mosmol/kg H2O which occurred when the antelopes were severely dehydrated. 3. At the high air temperatures (40 to 45 degrees C) cutaneous evaporation measured with a non-ventilated sweat capsule was 19 g H2O m-2 h-1 and the respiratory rate over 360/min. Thus the respiratory tract seems to be the major avenue for dissipating excess heat in dik-dik exposed to thermal stress. Injection of adrenaline, intravenously, stimulated sweat discharges similar to those observed in the small gazelles, and sheep and goats. 4. The low-water exchange and an efficient kidney helps explain the ability of this small antelope to inhabit hot arid areas.
Proceedings of the Royal Society of London. Series B, Biological Sciences © 1973 Royal Society