Bird Community Structure In The Formation Of Factor Analysis

I studied the factors that influence avian community organization in Zuojia narural protective reserve and Dagang forestry center in Jilin province during the period between April to July, 200land 2002 (and combine part data that collected in the same area since 1996). The contents include: the relationship between habitat and avian community; the resource utilizatin among avian community; the role of community organiger in avian community; the influnence of habitat fragmentation onavian community organization. The conclusion as follows:1. Habitat heterogeneity influence avian community compositionThe higher habitat heterogeneity is with the more complex community. Every bird species has its own adaptive breeding habitat, thus every habitat contains particular avian community.2. The birds use resources in guilds in secondary forestsThe birds can be divided into 7 guilds in Zuojia secondary forests according to foraging habitat and height, thertby they can use the foraging space and resources efficiency.The secondary forest breeding use birds nest-site resources vertically, they can be divided into nesting in tree coronal layer guild, nesting on tree trunk guild, nestig in the under forest layer guild.The vegetation structure of secondary forest influences the species composition and quantity of avian community, but which is different in different guilds.There exists resource partition in nest-site selection among grassland birds. The main factors that influence grassland bird nest-site selection are the height and density of herbage, and the density ofArmerniaca sibiric.3. There exists community organizer during the process of secondary foresrt birds community formingPied magpie is one of the community organizers in secondary forest, itmainly influences the raptors community structure, and influences large bird guilds that nesting on ground and cavity-nesting birds indirectly, thereby it influences the whole birds community structure.The primary cavity-nesting bird is the organizer for mountainous secondary forest birds community by providing nest-site. The change of excavated cavity quantity influence the quantity of Ashy Starling significantly, the change of all cavity influence the quantity of Great Tit and Ashy Starling significantly.The rato of every secondary cavity-nesting bird reuse the old nest-site that used by the same species is high, different species can use old nest-site across. The reproductive success of secondary cavity-nesting birds influenced by nest-site characteristics.4. Habitat fragmentation can lead to form new avian communityThe species number of birds community raises following the increase of pathes area. The area size with little influence on birds that nest in cavities and shrubs, and the birds that nesting on ground and in tree coronal layer influenced by area size.5. We bring forward the pattern of mountainous secondary forest avian community.