Analysis of roosting site characteristics of wintering Crossoptilion crossoptlion populations

Abstract

Abstract: From January to April 2003,we studied the roosting site characteristics of Crossoptilon crossoptilon populations around Zhujie Monastery in Daocheng Country,Sichuan Province.We randomly tracked the populations we met before dusk until they roosted in woods,by which we could decide the accurate positions of the bird's roosting sites.Line transects of systematic sampling were used to survey the fundamental characteristics of the environmental variables in the study area.We obtained 172 grids (200 m? 200 m) including 37 active grids (with roosting sites) valued 1 and 135 inactive grids (without roosting site) valued 0.We used logistic multiple regression to derive the predictive model of wintering roosting-site selection for the flocks.The predictive model could be expressed well by the following equation:Ln[P/(1-P)]=-3.938+0.083譫egree of slope+0.037譼ree cover+0.116譼ree height-0.003議erb cover (P was the probability of the occurrence of C.crossoptilon Populations roosting-site).Results showed that the variables of degree of slope,wood cover,wood height and herb cover were the most important factors affecting the occurrence of the roosting sites for the Populations.The occurrence of the roosting sites was positively related to degree of slope,wood cover and wood height,and negatively related to herb cover.The model could accurately predict the occurrence of the roosting site of C.crossoptilon Populations.

Key words: Arbuscular mycorrhizal fungi, Steppe plants, Environmental factors, Tibet Plateau

CLC Number:

Q958

JIA Fei, WANG Nan, ZHENG Guangmei. Analysis of roosting site characteristics of wintering Crossoptilion crossoptlion populations[J]. cje, 2005, (2): 153-158.

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