The Study Of Magpies' Nest-site Selection In Mountainous Region Secondary Growth Forest

The author had researched magpies' (Pica pica sericea Gould) nest-site selection withinmountainous region secondary growth forest in Zuojia Natural Reserve of Jilin Province fromMarch 2004 to April 2006. The study mainly included behavioral observation, characteristicsof nest-site selection, potential nest location and the influence of magpie nest on otherbreeding birds.The results showed that the reproduction density of magpies was correlated with thediversity of habitat structure, they were have remarkable correlativity, that was the habitatstructure was more complexity, and the reproduction density was more bigger. The averageheight of trees and the distance near farmland of magpies nest were different from comparablesamples. The height of trees, distance near farmland, and height of shrubbery affected the rateof utilizing in different samples. The magpie nest-site selection was mainly broadleaf and hadthe selectivity to species of trees. The rate of utilizing Quercus mongolica was the highest,that was 81.3﹪, and the Tilia mandshurica Rupr.et Maxim. was 9.34﹪. Although the magpiewould select else broadleaf, the rate of utilizing was lower. In nest-site selection, the magpieselected the trees as well as the little habitats near trees.The altitude of nest arbor, the distancewhich between forest grassplot and sample, the average diameter of nest arbor, the diameterof nest branch and the cover of up nest are the primary factors of magpie choosing nest.Magpie is faith to the nest choosing, most new nest are built about 30m near the old nest,and some places of old nests are used to built the new nest, or the old nests are used again.The magpie nest is not only the progenitive location of itself, but also the progenitivelocation of some raptors. The using rate of the used magpie nest which had be impropriate byAsio otus Linnaeus,Falco tinnunculus Linnaeus and Falco amurensis Linnaeus is 52.4%,theusing rate of the new magpie nest which be impropriate by Falco tinnunculus,Falcoamurensis and Falco subbuteo Linnaeus is 23.1%,the total using rate is 41.2%.