Factor-analysis on Habitat-selection of the Avian Community at the Artificial Wetlands Behind the Chongming Dongtan Seawall During Winter and Spring
上海崇明东滩堤内次生人工湿地鸟类冬春季生境选择的因子分析

From December 2004 to May 2005, an avian study was undertaken in the artificial wetlands of 200-ha area behind the 1998's seawall in Chongming Dongtan, Shangh ai. A total of 56 bird species of 8 orders and 15 families were counted in the w inter of 2004, and the dominant species were waterbirds and shorebirds; 55 speci es of 10 orders and 19 families were counted in the spring of 2005, which were d ominated by shorebirds. Meanwhile, the environmental factors including water lev el, water area, vegetation coverage, macrobenthos density, fishing status and hu man disturbance were measured quantitatively. Based on multi-regression analysi s between bird community and environmental variables, the results indicated that in winter, the vegetation coverage positively correlated with bird species abun dance; the water level, water area and fishing status impacted on the bird numbe r and diversity of species, genus and family; and the macrobenthos density affec ted the number and evenness of birds. In spring, the water area had positive rel ationship with bird species abundance, but the water level became a negative fac tor on the bird species abundance and number; the birds species diversity and ev enness were affected by water level, water area and vegetation coverage; macrobe nthos density correlated with bird diversity positively. The research could not prove that the fishing activities produced a significant impact on the bird comm unity.