Gastrointestinal and renal responses to water intake in the green-backed firecrown (Sephanoides sephanoides), a South American hummingbird

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Bradley Hartman Bakken, Pablo Sabat

Abstract

To maintain water balance, nectar-feeding vertebrates oscillate between meeting the challenges of avoiding overhydration and preventing dehydration. To understand how green-backed firecrowns (Sephanoides sephanoides) accomplish this, we examined the response of water-handling processes in the gastrointestinal tract (GIT) and kidney to different rates of water intake during the evening, night, and morning. Fractional water absorption in the GIT was independent of water intake rate (evening: 0.91 +/- 0.08; morning: 0.88 +/- 0.04). Consistent with this nonregulated water absorption, we found linear increases in water flux, fractional turnover of body water, and the rate of renal water loading as water intake rate increased during both the evening and morning. Despite these relationships, glomerular filtration rate (GFR) was insensitive to water loading (evening: 2.08 +/- 0.56 ml/h; morning: 1.84 +/- 0.68 ml/h) and less than the allometric expectation (2.92 ml/h). During the evening, fractional renal water reabsorption decreased linearly as the rate of water intake increased. At night, a period of natural fasting for hummingbirds, mean GFR was not different from zero (0.00 +/- 0.05 ml/h). These findings indicate that green-backed f...Continue Reading

References

Jan 1, 1977·The American Journal of Physiology·J E HallB M Farr
Dec 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·R K SuarezP W Hochachka
Feb 1, 1989·The American Journal of Physiology·D L Goldstein, E J Braun
Jul 1, 1994·Kidney International·K W FlorijnP C Chang
Nov 12, 1996·Proceedings of the National Academy of Sciences of the United States of America·D D LooE M Wright
Mar 30, 2002·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Susan W Nicolson
Jan 9, 2003·The Journal of Experimental Biology·Todd J McWhorterBerry Pinshow
Feb 20, 2003·Proceedings. Biological Sciences·B Irene TielemanPaulette Bloomer
Feb 26, 2003·Physiological and Biochemical Zoology : PBZ·B Irene Tieleman, Joseph B Williams
Sep 11, 2003·The Journal of Experimental Biology·Michael J HaugenJoseph B Williams
Dec 17, 2003·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·M-H ChangW H Karasov
Mar 5, 2004·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·P A FlemingS W Nicolson
Aug 25, 2004·The Journal of Experimental Biology·Todd J McWhorterLizanne Roxburgh
Oct 9, 2004·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·David L Goldstein, Stacy Newland
Nov 24, 2004·The Journal of Experimental Biology·Bradley Hartman BakkenCarlos Martínez Del Rio
Apr 15, 2005·The New England Journal of Medicine·Christopher S D AlmondDavid S Greenes
Oct 18, 2005·Physiological and Biochemical Zoology : PBZ·Nicte RamirezLeticia Miron
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·J E SchondubeC Martínez del Rio
May 1, 1999·Journal of Morphology·Carol A BeuchatEldon J Braun

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Citations

Jun 30, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Cromwell PurchaseSusan Nicolson
Aug 14, 2009·Biological Reviews of the Cambridge Philosophical Society·Todd J McWhorterWilliam H Karasov
Oct 24, 2008·American Journal of Physiology. Renal Physiology·Bradley Hartman BakkenCarlos Martínez Del Rio
Nov 28, 2007·Physiological and Biochemical Zoology : PBZ·L Gerardo Herrera M, Carlos A Mancina G
Mar 16, 2012·Physiological and Biochemical Zoology : PBZ·Kathryn R NapierPatricia A Fleming
Feb 6, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·S Lerch-HenningS W Nicolson
Jul 26, 2013·American Journal of Physiology. Renal Physiology·Alexander R Gerson, Christopher G Guglielmo
Jan 7, 2015·Physiology·Edwin R PriceWilliam H Karasov

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