![Emigration and Mortality of Black-Necked Swans (Cygnus melancoryphus) and Disappearance of the Macrophyte Egeria densa in a Ramsar Wetland Site of Southern Chile]()
Emigration and Mortality of Black-Necked Swans (Cygnus melancoryphus) and Disappearance of the Macrophyte Egeria densa in a Ramsar Wetland Site of Southern ChileEduardo J. Lopetegui, Roberto S. Vollmann, Heraldo C. Cifuentes, Cristian D. Valenzuela, Nelson L. Suarez, Enrique P. Herbach, Jorge U. Huepe, Gastón V. Jaramillo, Bruno P. Leischner and Ricardo S. Riveros · Ambio · 2007