Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology

Passerines lack functional salt glands and to a large extent avoid feeding on marine invertebrates. An exception is Cinclodes nigrofumosus. Previous studies reported that the contents of its gastrointestinal tract had a lower osmolality than seawater suggesting that birds were supplementing their ma...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	SABAT,PABLO, MARTÍNEZ DEL RÍO,CARLOS
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2005
Materias:	Cinclodes isotopes renal function osmoregulation seasonal changes
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200009
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0716-078X2005000200009
record_format	dspace
spelling	oai:scielo:S0716-078X20050002000092014-08-12Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiologySABAT,PABLOMARTÍNEZ DEL RÍO,CARLOS Cinclodes isotopes renal function osmoregulation seasonal changes Passerines lack functional salt glands and to a large extent avoid feeding on marine invertebrates. An exception is Cinclodes nigrofumosus. Previous studies reported that the contents of its gastrointestinal tract had a lower osmolality than seawater suggesting that birds were supplementing their marine invertebrate diet with terrestrial invertebrates and fresh water at certain periods of the year. We report seasonal changes in the diet of C. nigrofumosus at two contrasting coastal localities in Central Chile and document the potential correlation between weather and feeding habits with osmoregulatory features in this species. We expected that C. nigrofumosus would increase its use of osmotically challenging marine dietary sources when fresh water is available. Animals were collected at El Quisco and Los Vilos from central Chile during the mist cool winter and during the hot and dry summer. Immediatly after capture several physiological and morphological variables were determined at the field. We used stable isotope analysis as a proxy variable to measure the relative contribution of marine and terrestrial sources to the diet of Cinclodes nigrofumosus. Our results support the notion that osmoregulatory factors constraint dietary selection: in both localities birds consumed more marine prey when environmental conditions were less stressing, i.e., when lower environment temperatures, higher humidity and more fresh water was available. Our results also indicate that osmoregulatory physiology does not respond in a similar fashion in both seasons and suggest that osmoregulatory physiology of birds is affected by environmental variables in a complex fashioninfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.78 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200009en10.4067/S0716-078X2005000200009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cinclodes isotopes renal function osmoregulation seasonal changes
spellingShingle	Cinclodes isotopes renal function osmoregulation seasonal changes SABAT,PABLO MARTÍNEZ DEL RÍO,CARLOS Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
description	Passerines lack functional salt glands and to a large extent avoid feeding on marine invertebrates. An exception is Cinclodes nigrofumosus. Previous studies reported that the contents of its gastrointestinal tract had a lower osmolality than seawater suggesting that birds were supplementing their marine invertebrate diet with terrestrial invertebrates and fresh water at certain periods of the year. We report seasonal changes in the diet of C. nigrofumosus at two contrasting coastal localities in Central Chile and document the potential correlation between weather and feeding habits with osmoregulatory features in this species. We expected that C. nigrofumosus would increase its use of osmotically challenging marine dietary sources when fresh water is available. Animals were collected at El Quisco and Los Vilos from central Chile during the mist cool winter and during the hot and dry summer. Immediatly after capture several physiological and morphological variables were determined at the field. We used stable isotope analysis as a proxy variable to measure the relative contribution of marine and terrestrial sources to the diet of Cinclodes nigrofumosus. Our results support the notion that osmoregulatory factors constraint dietary selection: in both localities birds consumed more marine prey when environmental conditions were less stressing, i.e., when lower environment temperatures, higher humidity and more fresh water was available. Our results also indicate that osmoregulatory physiology does not respond in a similar fashion in both seasons and suggest that osmoregulatory physiology of birds is affected by environmental variables in a complex fashion
author	SABAT,PABLO MARTÍNEZ DEL RÍO,CARLOS
author_facet	SABAT,PABLO MARTÍNEZ DEL RÍO,CARLOS
author_sort	SABAT,PABLO
title	Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
title_short	Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
title_full	Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
title_fullStr	Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
title_full_unstemmed	Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
title_sort	seasonal changes in the use of marine food resources by cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
publisher	Sociedad de Biología de Chile
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200009
work_keys_str_mv	AT sabatpablo seasonalchangesintheuseofmarinefoodresourcesbycinclodesnigrofumosusfurnariidaeavescarbonisotopesandosmoregulatoryphysiology AT martinezdelriocarlos seasonalchangesintheuseofmarinefoodresourcesbycinclodesnigrofumosusfurnariidaeavescarbonisotopesandosmoregulatoryphysiology
_version_	1718439573987524608

Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology

Ejemplares similares