Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?

Feeding on saline marine foods may be especially challenging for passerine birds that lack functional salt glands and have a limited ability to concentrate urine. To reduce the salt load imposed by consumption of marine food these birds may select food with low salt contents and/or increase their in...

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Autores principales:	SABAT,PABLO, FARIÑA,JOSÉ M., SOTO-GAMBOA,MAURICIO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2003
Materias:	Cinclodes dietary habits osmoregulation osmotic load
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200017
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spelling	oai:scielo:S0716-078X20030002000172003-10-09Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?SABAT,PABLOFARIÑA,JOSÉ M.SOTO-GAMBOA,MAURICIO Cinclodes dietary habits osmoregulation osmotic load Feeding on saline marine foods may be especially challenging for passerine birds that lack functional salt glands and have a limited ability to concentrate urine. To reduce the salt load imposed by consumption of marine food these birds may select food with low salt contents and/or increase their intake of freshwater. The genus Cinclodes is particular among passerines because it includes species that inhabit both inland and maritime shores. We analyzed the diet of Cinclodes nigrofumosus and explored the possible relationships between dietary composition and salt load at mesic and arid coastal sites of Chile. From a biogeographical perspective, we hypothesized that freshwater availability is critical to the relationship between diet composition and osmotic load of C. nigrofumosus. Our analysis of prey abundance and distribution indicated that the diet of C. nigrofumosus is composed mainly by marine prey, in spite of the availability of terrestrial insects at both sites. Stomach content osmolality was higher in the arid site, but it was not correlated with prey type, which suggests that Cinclodes nigrofumosus avoid a high osmotic load, drinking fresh water when available. Thus physiological constraints are modulating niche breath of Cinclodesinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.76 n.2 20032003-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200017en10.4067/S0716-078X2003000200017
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cinclodes dietary habits osmoregulation osmotic load
spellingShingle	Cinclodes dietary habits osmoregulation osmotic load SABAT,PABLO FARIÑA,JOSÉ M. SOTO-GAMBOA,MAURICIO Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
description	Feeding on saline marine foods may be especially challenging for passerine birds that lack functional salt glands and have a limited ability to concentrate urine. To reduce the salt load imposed by consumption of marine food these birds may select food with low salt contents and/or increase their intake of freshwater. The genus Cinclodes is particular among passerines because it includes species that inhabit both inland and maritime shores. We analyzed the diet of Cinclodes nigrofumosus and explored the possible relationships between dietary composition and salt load at mesic and arid coastal sites of Chile. From a biogeographical perspective, we hypothesized that freshwater availability is critical to the relationship between diet composition and osmotic load of C. nigrofumosus. Our analysis of prey abundance and distribution indicated that the diet of C. nigrofumosus is composed mainly by marine prey, in spite of the availability of terrestrial insects at both sites. Stomach content osmolality was higher in the arid site, but it was not correlated with prey type, which suggests that Cinclodes nigrofumosus avoid a high osmotic load, drinking fresh water when available. Thus physiological constraints are modulating niche breath of Cinclodes
author	SABAT,PABLO FARIÑA,JOSÉ M. SOTO-GAMBOA,MAURICIO
author_facet	SABAT,PABLO FARIÑA,JOSÉ M. SOTO-GAMBOA,MAURICIO
author_sort	SABAT,PABLO
title	Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
title_short	Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
title_full	Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
title_fullStr	Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
title_full_unstemmed	Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
title_sort	terrestrial birds living on marine environments: does dietary composition of cinclodes nigrofumosus (passeriformes: furnariidae) predict their osmotic load?
publisher	Sociedad de Biología de Chile
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200017
work_keys_str_mv	AT sabatpablo terrestrialbirdslivingonmarineenvironmentsdoesdietarycompositionofcinclodesnigrofumosuspasseriformesfurnariidaepredicttheirosmoticload AT farinajosem terrestrialbirdslivingonmarineenvironmentsdoesdietarycompositionofcinclodesnigrofumosuspasseriformesfurnariidaepredicttheirosmoticload AT sotogamboamauricio terrestrialbirdslivingonmarineenvironmentsdoesdietarycompositionofcinclodesnigrofumosuspasseriformesfurnariidaepredicttheirosmoticload
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Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?

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