Norambuena M Cecilia, Bozinovic Francisco
Center for Advanced Studies in Ecology and Biodiversity, Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
J Zoo Wildl Med. 2009 Dec;40(4):624-31. doi: 10.1638/2007-0160.1.
The Cayumapu River black-necked swan (Cygnus melanocoryphus) population in southern Chile suffered a syndrome of malnutrition and hyperferremia in 2005. The iron metabolic imbalance could not be explained on the basis of the quality of their diet. Hence, the primary objective of this study was to determine the relationship between malnutrition and iron homeostasis in black-necked swans. It was proposed that catabolic processes could increase serum iron levels due to the release of endogenous iron from tissues. A free-living swan population undergoing natural nutritional imbalance due to molting was studied. In addition, swans captured were subjected to a diet restriction until they became emaciated. The results revealed that neither lipolytic activity nor emaciation affected serum iron concentrations. The increment of total iron binding capacity observed was in agreement with the reduction of endogenous iron stored, with the increase of erythropoeitic demand, or with both. Future studies are needed to determine the effect of incremental erythropoietic activity on iron homeostasis in anemic, malnourished birds.
2005年，智利南部的卡尤马普河黑颈天鹅（Cygnus melanocoryphus）种群出现了营养不良和高铁血症综合征。根据它们的饮食质量无法解释铁代谢失衡的情况。因此，本研究的主要目的是确定黑颈天鹅营养不良与铁稳态之间的关系。有人提出，分解代谢过程可能由于组织中内源性铁的释放而增加血清铁水平。对一群因换羽而自然营养失衡的自由生活天鹅进行了研究。此外，捕获的天鹅接受饮食限制，直到它们变得消瘦。结果显示，脂解活性和消瘦均未影响血清铁浓度。观察到的总铁结合能力的增加与储存的内源性铁的减少、红细胞生成需求的增加或两者都有关。需要进一步的研究来确定贫血、营养不良鸟类中红细胞生成活动增加对铁稳态的影响。
