CPW Pronghorn Shapefile Download

Updated December, 2025 CONCENTRATION AREA: That part of the overall range where densities are at least 200% greater than the surrounding area during a season other than winter. LIMITED USE AREA: An area within the overall range of pronghorn that is occasionally inhabited and/or contains a small, scattered population of antelope. MIGRATION CORRIDORS: A specific geographic area that facilitates movement between seasonal ranges and receives higher use than the surrounding landscape, relative to herd or population use, and loss of which would disrupt migration. Starting in 2023 and moving forward, Brownian bridge model of movement data, where available, will be included in this layer. This represents a change in the methodology from how these data had previously been generated. MIGRATION PATTERNS: A subjective indication of the general direction of the seasonal movements of pronghorn. OVERALL RANGE: The area which encompasses all known seasonal activity areas within the observed range of a population of pronghorn antelope. PERENNIAL WATER: Sources of water known to be important to antelope survival in late summer or other drought periods. A four-mile radius should be described around a point source and four-mile band be drawn along a river or stream, which is then clipped to the Overall Range. RESIDENT POPULATION: An area that provides year round range for a population of pronghorns. The resident animals use all of the area all year long; it cannot be subdivided into seasonal ranges. A resident population may be found within the overall range of a larger, migratory population. SEVERE WINTER: That part of the winter range where 90% of the individuals are located when the annual snowpack is at its maximum and/or temperatures are at a minimum in the two worst winters out of ten. WINTER CONCENTRATION: That part of the winter range where animal densities are at least 200% greater than the surrounding winter range density during the same period used to define winter range in the average five winters out of ten. WINTER RANGE: That part of the overall range where 90 percent of the individuals are located between the first heavy snowfall and spring green-up during the average five winters out of ten OR for a site specific period defined by CDOW personnel for that DAU. Winter Range is only delineated for migratory populations. On the Eastern Plains Winter Range is defined as specific areas where pronghorn are known to migrate to on a consistent basis. 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.更新于2025年12月 密集区（Concentration Area）：指整体分布范围内，在非冬季的某一季节内，种群密度较周边区域至少高出200%的区域。 有限利用区（Limited Use Area）：指叉角羚（Pronghorn）整体分布范围内偶尔被栖息，或存在小型零散种群的区域。 迁徙廊道（Migration Corridors）：指促进季节性活动区间移动、相较于种群整体利用强度而言利用度高于周边景观的特定地理区域，其丧失将干扰迁徙活动。自2023年起，若可获取移动数据，将通过布朗桥模型（Brownian bridge model）生成相关图层，这与此前该类数据的生成方法有所不同。 迁徙模式（Migration Patterns）：对叉角羚季节性移动总体方向的主观性表征。 整体分布范围（Overall Range）：涵盖某一群叉角羚观测分布区内所有已知季节性活动区域的范围。 常年水源（Perennial Water）：指已知对叉角羚夏末或其他干旱时期生存至关重要的水源。需以点源为中心划定4英里半径范围，沿河流或溪流划定4英里宽的带状区域，随后将该范围裁剪至整体分布范围以内。 定居种群区（Resident Population）：指为某一群叉角羚提供全年活动范围的区域。定居种群全年利用该区域全部范围，无法划分为季节性活动区。定居种群可存在于更大规模迁徙种群的整体分布范围之内。 极端冬季（Severe Winter）：指在10年中最恶劣的2个冬季内，当年度积雪达到最大厚度、或气温达到最低值时，90%的个体所处的冬季活动区部分。 冬季密集区（Winter Concentration）：指在10年中平均5个冬季的同期冬季活动范围内，种群密度较周边冬季活动区密度至少高出200%的区域。 冬季活动区（Winter Range）：指整体分布范围内，在10年中平均5个冬季的首次强降雪至春季返青期间，90%的个体所处的区域；或由科罗拉多公园与野生动物局（Colorado Parks and Wildlife, CDOW）工作人员为对应的DAU划定的特定时段内的区域。冬季活动区仅针对迁徙种群划定。在东部平原地区，冬季活动区被定义为叉角羚规律性迁徙抵达的特定区域。 本数据集的信息源自科罗拉多公园与野生动物局的野外工作人员。数据通过SmartBoard交互式白板（SmartBoard Interactive Whiteboard），依托不同比例尺的地形图及美国国家农业影像计划（National Agriculture Imagery Program, NAIP）影像完成数字化采集。数据来源参考：Cowardin, M., M. Flenner. 2003年3月. 《最大化测绘资源利用》. 《GeoWorld》第16卷第3期：32-35。 本数据集采用四年轮换更新机制，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，不会在全州范围内逐年更新。