Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)

We studied the osmoregulatory responses of the granivore Zonotrichia capensis, acclimated to high- and low-protein diets as well as two levels of water intake. We tested whether Z. capensis has the ability to modify the proportion of nitrogenous waste in the excreta when protein intake and water int...

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Autores principales:	ALDEA,PATRICIA, SABAT,PABLO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2007
Materias:	granivory kidney nitrogenous waste osmoregulation passerines
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400006
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spelling	oai:scielo:S0716-078X20070004000062008-03-18Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)ALDEA,PATRICIASABAT,PABLO granivory kidney nitrogenous waste osmoregulation passerines We studied the osmoregulatory responses of the granivore Zonotrichia capensis, acclimated to high- and low-protein diets as well as two levels of water intake. We tested whether Z. capensis has the ability to modify the proportion of nitrogenous waste in the excreta when protein intake and water intake varies. After 21 days of acclimation, plasma osmolality was not significantly affected by dietary treatment; however, excreta osmolality was higher in the high-protein group compared to the low-protein group. Nitrogenous wastes in Z. capensis are excreted mainly in the form of uric acid. The proportion of kidney devoted to medullary tissue was 40 % higher in dehydrated birds than in hydrated birds. Excreta osmolality was higher in dehydrated birds, and in all cases higher than plasma concentration by more than 300 mOsm kg"¹. Our data do not support the hypothesis that Z. capensis can switch nitrogen excretion pathways. We hypothesize that the low water content of the seed-base diet, the comparatively low water intake, and the large difference between urine and plasma concentrations may minimize the retrograde flux of urine to the lower intestinal tract, thereby reducing the potential for post-renal urine modificationinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.80 n.4 20072007-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400006en10.4067/S0716-078X2007000400006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	granivory kidney nitrogenous waste osmoregulation passerines
spellingShingle	granivory kidney nitrogenous waste osmoregulation passerines ALDEA,PATRICIA SABAT,PABLO Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
description	We studied the osmoregulatory responses of the granivore Zonotrichia capensis, acclimated to high- and low-protein diets as well as two levels of water intake. We tested whether Z. capensis has the ability to modify the proportion of nitrogenous waste in the excreta when protein intake and water intake varies. After 21 days of acclimation, plasma osmolality was not significantly affected by dietary treatment; however, excreta osmolality was higher in the high-protein group compared to the low-protein group. Nitrogenous wastes in Z. capensis are excreted mainly in the form of uric acid. The proportion of kidney devoted to medullary tissue was 40 % higher in dehydrated birds than in hydrated birds. Excreta osmolality was higher in dehydrated birds, and in all cases higher than plasma concentration by more than 300 mOsm kg"¹. Our data do not support the hypothesis that Z. capensis can switch nitrogen excretion pathways. We hypothesize that the low water content of the seed-base diet, the comparatively low water intake, and the large difference between urine and plasma concentrations may minimize the retrograde flux of urine to the lower intestinal tract, thereby reducing the potential for post-renal urine modification
author	ALDEA,PATRICIA SABAT,PABLO
author_facet	ALDEA,PATRICIA SABAT,PABLO
author_sort	ALDEA,PATRICIA
title	Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
title_short	Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
title_full	Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
title_fullStr	Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
title_full_unstemmed	Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
title_sort	osmoregulatory responses to dietary protein and water intake in the granivorous zonotrichia capensis (passerine, emberizidae)
publisher	Sociedad de Biología de Chile
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400006
work_keys_str_mv	AT aldeapatricia osmoregulatoryresponsestodietaryproteinandwaterintakeinthegranivorouszonotrichiacapensispasserineemberizidae AT sabatpablo osmoregulatoryresponsestodietaryproteinandwaterintakeinthegranivorouszonotrichiacapensispasserineemberizidae
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Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)

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