CPW White-tailed Ptarmigan Shapefile Download

Updated December, 2025 OVERALL RANGE: The probable range of White-tailed Ptarmigan in Colorado as determined from the following criteria: Areas greater than 10,800 feet in elevation; Colorado GAP vegetation types Mixed Tundra, Meadow Tundra, Prostrate Shrub Tundra, Bare Ground Tundra, Exposed Rock, Shrub Dominated Wetland/Riparian, and Graminoid/Forb Dominated Wetland. WINTER RANGE: Area utilized in winter most frequently where drainage basins at or above treeline and stream courses below treeline from 2,591 to 3,810 meters elevation (8,500 to 12,500 feet) where food (willow) and roosting sites (soft snow) are readily available. Winter range is typically defined from late October thru mid-April. The CPW Special Report Number 38, Wintering Areas and Winter Ecology of White-tailed Ptarmigan in Colorado published in 1976 was used as the base data for development of the ptarmigan winter range dataset. This information was derived from Colorado Parks and Wildlife field personnel. Data was captured by digitizing through a SmartBoard Interactive Whiteboard using topographic maps and NAIP imagery at various scales (Cowardin, M., M. Flenner. March 2003. Maximizing Mapping Resources. GeoWorld 16(3):32-35). These data are updated on a four year rotation with one of the four Colorado Parks and Wildlife Regions updated each year. These data are not updated on a statewide level annually.

2025年12月更新

【整体分布范围】基于以下标准确定的科罗拉多州白尾雷鸟（White-tailed Ptarmigan）潜在分布范围：海拔高于10800英尺的区域；科罗拉多州GAP植被类型（GAP vegetation types）涵盖混合苔原、草甸苔原、匍匐灌木苔原、裸地苔原、裸露岩石、灌木主导湿地/河岸带以及禾草/草本植物主导湿地。

【冬季分布范围】冬季最频繁使用的区域，即海拔2591至3810米（8500至12500英尺）、流域位于林线以上且溪流河道位于林线以下的区域，此处可便捷获取充足的食物（柳树）与栖息场所（松软积雪）。冬季分布范围通常对应10月下旬至4月中旬的时段。

本冬季分布数据集的基础数据源自1976年发布的《科罗拉多州白尾雷鸟越冬区域与越冬生态学》（CPW第38号专项报告），该信息由科罗拉多公园与野生动物局（Colorado Parks and Wildlife，简称CPW）野外工作人员采集。数据通过结合不同比例尺的地形图与美国国家农业航空影像计划（National Agriculture Imagery Program，简称NAIP）影像，依托SmartBoard交互式白板（SmartBoard Interactive Whiteboard）完成数字化采集（引自Cowardin, M., M. Flenner. 2003年3月. 《最大化制图资源》. 《地理世界》16(3):32-35）。

本数据集每四年完成一轮更新，每年更新科罗拉多州四个公园与野生动物管理区域中的一个，并非每年对全州范围进行更新。