title: Using haematological parameters to infer the health and nutritional status of an endangered black-necked swan population.
abstract: Living organisms are continuously faced with several forms of environmental perturbation, one of the most important being human activity. In this scenario, the role of physiological studies on wildlife has proved to be important given that in vivo physiological variables reflect a great deal how sensitive animals are to acute environmental changes. We studied the haematological parameters in black-necked swans (Cygnus melanocoryphus) at the Ramsar site at the Carlos Anwandter Sanctuary, which were experiencing a drastic population decrease. Through seven months, body mass (body mass corrected by total length) was reduced 30%, which was followed by significant reductions of haemoglobin concentration, haematocrit and red blood cell count. Mean cell volume and mean cell haemoglobin concentration did not change with time, whereas there was a significant increase of the white blood cells and heterophile / lymphocyte ratio. Our results, together with the published evidence, suggests that the proximal factors associated with the mass mortality and emigration of the black - necked swan population at the "Carlos Anwandter Sanctuary" was a drastic nutritional deficiency, and the potentially toxic effects of iron pollution in the waters of the Ramsar site.
authors: Instituto de Ecología y Evolución, Facultad de Ciencias, Universidad Austral de Chile, Chile.
authors: Paulina
authors: P
authors: Artacho
authors: Mauricio
authors: M
authors: Soto-Gamboa
authors: Claudio
authors: C
authors: Verdugo
authors: Roberto F
authors: RF
authors: Nespolo
mesh_terms: D000818:Animals; D046090:Anseriformes / Q000097:blood*; D001772:Blood Cell Count; D001835:Body Weight; D003643:Death; D005260:Female; D006262:Health; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D008214:Lymphocytes; D008297:Male; D009752:Nutritional Status; D013997:Time Factors
chemical_list: D006454:Hemoglobins