5Morrison M L Bird population as indicators of environmental change [J]. Current Omithol, 1986(3) : 429 -451.
6Mike B, Doug W, Wes B, et al. Migratory Shorebirds of the East A- sian- Australasian Flyway: Population Estimates and Internationally Important Sites [ M ] . Wetlands International, 2008 : 1 - 3.
7Robert B, Matlock J, Peter J E. The influence of habitat variables on bird communities in forest remnants in Costa Rica [ J ] . Biodiversity and Conservation, 2006, 15:2987 -3016.
8Aristide A, Lutz B, Steven M, et al. Effects of forest fragmentation on genetic variation in endemic understory forest birds in central Mada- gascar [J] . Journal Ornithol, 20001 141 : 152 - 159.
9Irina L, Nils B, Katrin B G. Avian diversity in a Kenyan agroecosys- tern,, effects of habitat structure and proximity to forest [ J ] . Journal Ornithol, 2008, 149:181-191.