dc.creatorSabat Kirkwood, Alejandro Pablo
dc.creatorMaldonado, Karin
dc.creatorFariña, Jose Miguel
dc.creatorDel Rio, Carlos Martínez
dc.date.accessioned2019-01-29T13:47:56Z
dc.date.available2019-01-29T13:47:56Z
dc.date.created2019-01-29T13:47:56Z
dc.date.issued2006
dc.identifierOecologia, Volumen 148, Issue 2, 2006, Pages 250-257
dc.identifier00298549
dc.identifier10.1007/s00442-006-0377-4
dc.identifierhttps://repositorio.uchile.cl/handle/2250/159863
dc.description.abstractCinclodes nigrofumosus and C. oustaleti are two closely related songbirds that inhabit the northern Chilean coast during the austral fall and winter.This stretch spans a dramatic north to south latitudinal gradient in rainfall and temperature. Whereas C. nigrofumosus lives exclusively on coastal environments, C. oustaleti shifts seasonally from coastal environments to inland freshwater ones. We used the δ13C of these two species’ tissues to investigate whether the reliance on marine versus terrestrial sources varied from the hyper-arid north to the wet south. We also investigated latitudinal variation in the renal traits that mediate how these birds cope with dehydration and a salty marine diet. Both species increased the incorporation of terrestrial carbon, as measured by δ13C, as terrestrial productivity increased southwards. However, C. nigrofumosus had consistently more positive (i.e. more marine) and less variable δ13C values than C. oustaleti. The osmoregulatory traits of both species varied with latitude as well. Urine osmolality decreased from extremely high values in the north to moderate values in the south, while C. nigrofumosus produced more concentrated urine than C. oustaleti. In both species, the proportion of kidney devoted to medullary tissue decreased from north to south, and kidney size increased significantly with latitude. Cinclodes nigrofumosus had larger kidneys with larger proportions of medullary tissue than C. oustaleti. C. nigrofumosus and C. oustaleti are terrestrial organisms subsidized by a rich marine environment where it is adjacent to an unproductive terrestrial. Variation in the reliance on marine food sources seems to be accompanied by adjustments in the osmoregulatory mechanisms used by these birds to cope with salt and dehydration.
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile
dc.sourceOecologia
dc.subjectCinclodes
dc.subjectLatitudinal gradient
dc.subjectMarine-terrestrial nutrient transfer
dc.subjectOsmoregulation
dc.subjectStable isotopes
dc.titleOsmoregulatory capacity and the ability to use marine food sources in two coastal songbirds (Cinclodes: Furnariidae) along a latitudinal gradient
dc.typeArtículo de revista


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