Analysis of Water Birds Diversity in Mianyang, Sichuan Province, China

We conducted water fowl fauna survey by using linear transect sampling method from January 2000 to January 2003 in Mianyang, Sichuan, China. Fifty eight species of water birds, belonging to 7 orders, 10 families and 30 genera, were recorded during the survey. Nineteen species of them are the provincial protected birds. There are 12 species (20.7% of the total) of residents, four species(6.92%)of summer birds, 21(36.19%)species of winter birds and 21species(36.19%) of passengers. Among 58 species of water birds, 43 species are the avian species of plaeonaretic, nine species of Oriental birds and six species of widespread birds. The value of each diversity index of water birds of Mianyang is H′ =2.573?6(Shannon Winer index)、 J =0.633?8(Pielou index) and D G-F =0.593?6 ( G-F index). Among three different kinds of wetland habitats: Fujiang River valley (about 130 km long), rice paddy, and large reservoir, the biggest value of diversity index was found in the Fujiang River valley. The results indicated that the water birds are facing the threats from the environmental degradation and human activity in the area.