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J Physiol Volume 540, Number 3, 1039-1046, May 1, 2002 DOI: 10.1113/jphysiol.2001.016980
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Journal of Physiology (2002), 540.3, pp. 1039-1046
© Copyright 2002 The Physiological Society
DOI: 10.1113/jphysiol.2002.016980

Hypertonic fluids are secreted by medial and lateral segments in duck (Anas platyrhynchos) nasal salt glands

David G. Butler

Departments of Zoology and Physiology, University of Toronto, Toronto, Ontario, Canada M5S 3G5

Indwelling catheters were used to collect fluid directly from the medial and lateral segments of duck nasal salt glands showing, for the first time, that the secretions are fully hypertonic before reaching the medial and lateral drainage ducts. Using this method it was possible to show that (a) there is a functional symmetry between the left and right salt glands, (b) the medial segment always secretes fluid at approximately twice the rate of the lateral segment and (c) fluid secreted by the medial segment has the same ionic composition but variable ion concentrations when compared with fluid from the lateral segment. A 12 % increase in post-segmental fluid osmolality was probably due to the evaporation of water from epithelial surfaces in the nasal cavities during breathing. A post-segmental outflux of Ca2+, Mg2+ and Cl- in the medial and lateral collecting ducts and/or nasal epithelium may be of adaptive significance when birds inhabit calcium- and magnesium-rich marine environments.



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C. Muller, M. Sendler, and J.-P. Hildebrandt
Downregulation of aquaporins 1 and 5 in nasal gland by osmotic stress in ducklings, Anas platyrhynchos: implications for the production of hypertonic fluid
J. Exp. Biol., October 15, 2006; 209(20): 4067 - 4076.
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