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Corpus Systématique Animale

Titre du document

Sodium excretion rates and renal responses to acute salt loading in the European starling

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Springer (journals)
Langue(s) du document
Type de document
Mots-clés d'auteur
  • Avian kidney
  • Sodium excretion
  • Cloacal salt transport
  • Salt loading
  • Glomerular filtration rate
Nom du fichier dans la ressource
Mammiferes_v2b_00282, Oiseaux_v2b_00349
  • Gary Laverty 1
  • Robert F. Wideman Jr. 2
  • 1) School of Life and Health Sciences, University of Delaware, 19716, Newark, Delaware, USA
  • 2) Department of Poultry Science, The Pennsylvania State University, 206 William L. Henning Bldg., 16802, University Park, Pennsylvania, USA

Renal clearance studies were performed in European starlings (Sturnus vulgaris) in order to determine the extent of ureteral sodium excretion under control conditions and during an acute, hyperosmotic salt stress. These experiments also estimated the contribution of the lower intestine (colon and cloaca) to postrenal solute reabsorption by making both cloacal and ureteral urine collections in the same birds. A comparison of ureteral vs cloacal excretion rates found significantly higher sodium (9.09±1.30 vs 1.03±0.38 ?Eq·kg?1·min?1) and chloride (4.15±0.56 vs 1.00±0.38 ?Eq·kg?1·min?1) excretion rates during the ureteral collections. Fractional excretion of sodium was also significantly higher during ureteral collections, but this value did not exceed 1% of the filtered sodium load during either collection series. Urine flow rate was significantly higher during cloacal collections, suggesting osmotic back-flux of water across the cloacal wall. Infusion of a 1M NaCl solution resulted in rapid increases in glomerular filtration rate (GFR), urine flow rate, and urine osmolality. Fractional sodium and water reabsorption decreased by 11% and 4%, respectively. Glomerular counts and size distribution profiles, measured by in vivo alcian blue labelling, provided no evidence for a reduction in the number of filtering glomeruli during hyperosmotic saline loading. We conclude that renal sodium excretion rates for the starling are similar to those seen in other avian species and in mammals. These studies also provide direct evidence for postrenal modification of urine in this species, even under conditions of continuous flow. Acute hyperosmotic salt stress can, under some conditions, cause increased rather than decreased GFR, indicating multiple regulatory pathways. Finally, there was no evidence in these studies for glomerular shutdown in response to salt loading.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - physiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences medicales
  • 4 - ophtalmologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Endocrinology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Animal Science and Zoology
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Biochemistry
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Physiology
Catégories WoS
  • 1 - science ; 2 - zoology
  • 1 - science ; 2 - physiology
Identifiant ISTEX

Journal of Comparative Physiology B

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Score qualité du texte
  • Mammiferes
  • Oiseaux
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