关键词: 蒙原羚, 生境选择, 信息理论方法, Logistic 回归方程, 达赉湖

Abstract: The Mongolian gazelle (Procapra gutturosa) is the most abundant ungulate on the Asia-European steppe. During
May and June of 2005 and 2006 we studied habitat selection of Mongolian gazelles on 20 randomly set transects around Dalai Lake, Inner Mongolia. We characterized 20 ecological factors that we hypothesized may determine habitat selection of Mongolian gazelles, with the aim of identifying key features influencing their habitat use. We used an information theoretic approach and logistic regression to build habitat selection models,and used a resource selection index and a resource selection function method to assess preference of primary habitat factors. The most parsimonious auto-logistic model was a good predictor of Mongolian gazelle habitat selection. Livestock disturbance was an important covariate predicting gazelle presence (β= 10. 898). Position on slope,distance from water, slope, shelter, distance from fences,and vegetation type were important predictors of habitat use by Mongolian gazelles (β > 1. 000). Distance to nearest road,aboveground vegetation biomass, plant height,vegetation cover and species richness were secondary factors which lacked significant predictive value on habitat use (β < 1.000). Gazelles preferred habitats < 2 000 m and > 4 000 m from livestock distance, lower and middle portions of slopes as well as flat areas,distance from water sources of 4 000 - 8 000 m,slopes of < 10°, < 3 000 m shelter condition (viewable range),1 000 -2 000 m from fences,and vegetation types characterized by Stipa spp. and forbs. Habitat selection models and corresponding tables of important resources can be used to guide and evaluate
future conservation activities of Mongolian gazelle. The principal strategy for its conservation in spring is to reduce intensity of grazing by domestic livestock. Controlling the livestock population in the trans-boundary area, and scientific grassland and grazing management in areas further from international borders are important for conservation of Mongolian gazelle. Furthermore, artificial supply of food and water, grassland protection, grass cutting rationalization and reasonable fence construction and management are effective policies for conservation of this species.

Key words: Dalai Lake, Habitat selection, Information theoretic approach, Logistic regression equation, Mongolian gazelle(Procapra gutturosa)