Human interference and avifaunal diversity of two wetlands of Jalpaiguri, West Bengal, India

Avifaunal diversity and abundance were studied in two wetlands of Jalpaiguri District, West Bengal, India, in relation to eight wetland characteristics supposedly directly or indirectly affected by human activities. Although the climatic and geophysical conditions of both the wetlands are almost similar, a total of 80 bird species were recorded from one wetland and the other supported only 42 species. The relationship between habitat characteristics and community structure varied throughout the year, suggesting that the birds respond differently to one or other habitat characteristic depending on the season. Larger wetland size supported higher bird diversity and abundance as far as resident and local migrants are concerned. Winter migrant density and diversity, however, reached higher values in structurally more heterogeneous wetlands having fewer submerged aquatic vegetation. All these habitat characteristics become highly influenced by intense agricultural practices in the wetland with fewer bird diversity and density.