Effect of water restriction on energy and water balance and osmoregulation of the fruit bat Rousettus aegyptiacus

Z. Arad, C. Korine

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


The energy budget, water balance and osmoregulation of the fruit bat, Rousettus aegyptiacus, were studied during normal hydration and during water restriction (oven-dried apple diet). The water input and output were balanced during both normal hydration and water restriction. The kidney of the fruit bat is well adapted to handle the water load from its fruit diet by excreting large volumes (14% of the body mass per day) of dilute urine (113±25 mosmol·kg H2P-1) as well as reducing urine volume (-95%) and increasing urine osmotic concentration (555±280 mosmol·kg H2O-1) during water restriction. The haematocrit, plasma haemoglobin and total protein concentrations did not increase during water restriction and heat exposure, suggesting the conservation of plasma volume. Gross energy intake was not alfected by water restriction. However, digested energy intake and digestibility were significantly reduced. The effective regulation of energy and water budgets during water restriction suggests that the fruit bat can cope with seasonal climatic changes and with variable fruit supply during various seasons.

Original languageEnglish
Pages (from-to)401-405
Number of pages5
JournalJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Issue number5
StatePublished - 1 Oct 1993
Externally publishedYes


  • Energy budget
  • Fruit bat, Rousettus aegyptiacus
  • Osmoregulation
  • Water balance
  • Water restriction

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry
  • Physiology
  • Animal Science and Zoology
  • Endocrinology


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