Study on Food Habit of Wintering Cygnus columbianus in Dongting Lake

In order to understand more about the food habit of wintering Cygnus columbianus in Dongting Lake, methods of microscopic analysis of cell remains in feces and field observation were employed in the study. The results showed that wintering Cygnus columbianus’s main food was Potamogeton crispus, Carex tristachya and Phalaris arundinacea. Wintering Cygnus columbianus would change food with different living environments and stages, in order to adapt the changes of the environment.