title: Mineral metabolism in a black-necked swan (Cygnus melanocoryphus) population from southern Chile.
abstract: A population of black-necked swans (Cygnus melanocoryphus) residing in a perturbed habitat revealed a low body mass, malnutrition, and hyperferremia during 2005; the swans main dietary item, Egeria densa, was lost during an environmental crisis which occurred in 2004. The objective of this study was to monitor the diet and nutritional status of this population during 2006, as well as to verify how the consumption of sediment, as part of their new diet, may explain the mineral disorders observed in these birds. Results revealed that swans increased their body mass and had an adequate protein, lipid, and iron metabolism, in spite of the fact that they maintained the same new diet (sediment and roots) during 2005-2006. In addition, transferrine saturation was indicative of the high endogenous iron load in birds which agrees with the high iron load of their environment. On the other hand, the consumption of the Cayumapu River sediment in the diet (25%) did not affect the body mass nor the nutritional and hepatic function in domestic geese over a 45-day period.
authors.affiliation: Center for Advanced Studies in Ecology and Biodiversity, Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile. mcnoramb@puc.cl
authors.forename: M Cecilia
authors.initials: MC
authors.lastname: Norambuena
authors.forename: Francisco
authors.initials: F
authors.lastname: Bozinovic
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000835:Animals, Wild; D046090:Anseriformes / Q000378:metabolism*; D002677:Chile; D004032:Diet / Q000662:veterinary*; D017753:Ecosystem; D004784:Environmental Monitoring; D005247:Feeding Behavior / Q000502:physiology; D019015:Geologic Sediments; D008297:Male; D008903:Minerals / Q000378:metabolism*; D009752:Nutritional Status
chemical_list: D008903:Minerals