Modeling foraging habitats of Hume’s Pheasant (Syrmaticus humiae) in Dazhong Mountain, Yunnan, southwestern China

云南大中山黑颈长尾雉取食生境模拟分析(英文)

We modeled foraging habitats of Hume’s Pheasant (Syrmaticus humiae) on a macro-habitat level using ArcGIS in an attempt to provide scientific reference for management and restoration of habitats. Field work was conducted from March to April in 2006 and 2008, and from October to November in 2005 and 2008 in Dazhong Mountain, Yunnan Province, southwestern China. The selection of ecological factors was estimated by means of a resource selection index, distance analysis and the method of hierarchical habitat selection. The foraging habitat patches were modeled spatially by ArcGIS. The results show that actual and potential foraging patches overlapped considerably in spring and autumn. The number and total areas of patches in the autumn were smaller than those in the spring. The minimum and average areas of patches in the autumn were larger than those in the spring, while the maximum areas of actual and potential foraging patches in the autumn were equal to those in the spring. Similarity in the selection for survival and safety consideration in both seasons was the main strategy for landscape factors of habitats by Hume’s Pheasant, while seasonal difference in selecting a landscape matrix was their secondary strategy, affecting landscape factors in the habitat. Changes of foraging patches in both seasons reflect a difference of resources requirement by the bird. Fragmentation and miniaturization of foraging patches would result in the formation of a meta-population of Hume’s Pheasant.

我们用ArcGIS从宏生境尺度模拟黑颈长尾雉(Syrmaticus humiae)的取食生境,期望为该物种的科学管理和生境恢复提供科学指导。外业工作分别于2006年和2008年的3–4月,2005年和2008年的10–11月在中国云南大中山进行。以资源选择函数、距离分析和生境层级选择方法评价生态因子的选择性。利用ArcGIS模拟黑颈长尾雉空间取食生境斑块。结果显示,黑颈长尾雉春、秋季潜在和实际取食生境斑块重复很大。秋季的生境斑块数量、总面积均小于春季的。秋季的斑块最小面积和平均面积却大于春季的,而秋季的潜在和实际取食斑块的最大面积却与春季的相等。春、秋两季间生存和安全条件选择的相似性是黑颈长尾雉对栖息地景观因子选择的主要策略,而景观基质选择的季节差异是辅助策略。季节间斑块的变化反映了该鸟对资源需求的差异。取食生境的片断化和小型化将导致黑颈长尾雉小种群的形成。