LCR MSCP Rodent Monitoring Summary Data

Summary data for Lower Colorado River Multi-Species Conservation Program (LCR MSCP) rodent monitoring at conservation areas, as polygons with point representation. Each polygon represents a trapping effort with number of each species captured during that trapping effort. Within the LCR MSCP habitat creation goals, 125 acres of habitat are to be created for the Colorado River cotton rat, and 76 acres are to be created for the Yuma hispid cotton rat. It is currently believed that the ranges of these two cotton rat species do not overlap. Those captured south of the Trigo and Chocolate Mountains in the area of the Imperial National Wildlife Refuge and south of the Yuma, Arizona, area to date are Yuma hispid cotton rats. Those captured north of the aforementioned mountain ranges to date are Colorado River cotton rats. The northernmost historic records of Colorado River cotton rats are from an area just south of Laughlin, Nevada (Bradley 1966; Hall 1946). Colorado River cotton rats were captured in 2012 at the Big Bend Conservation Area, marking the first record of the species in Nevada since 1966. Desert pocket mice occur in creosote bush (Larrea tridentata) and xeric riparian communities of the Southwest, from Baja California, Mexico in the South and southeastern California, southern Nevada, and extreme southwestern Utah in the North. The range of the sobrinus subspecies is not well documented, but it is believed to be within Clark County, Nevada, and may be present farther south. The desert pocket mice caught during rodent surveys are not evaluated to determine whether or not they were of the sobrinus subspecies. Each polygon is the minimum convex polygon of trapping locations at a given transect/date). Attributes of polygon include number of each species trapped per trapping effort. RISE Catalog Item #4228: https://data.usbr.gov/catalog/4024/item/4228 To download data, please use the RISE Geospatial Open Data site: https://rise-usbr.opendata.arcgis.com/datasets/0dfb0ef37a5943f0b6eb48600aa2f73b本数据集为下科罗拉多河多物种保护计划（Lower Colorado River Multi-Species Conservation Program, LCR MSCP）在保护地开展的啮齿类动物监测汇总数据，数据以带点位标识的多边形形式呈现。每个多边形对应一次诱捕作业，记录了该次诱捕中捕获的各物种个体数量。根据LCR MSCP的栖息地营造目标，需为科罗拉多河棉鼠（Colorado River cotton rat）营造125英亩的栖息环境，为尤马硬毛棉鼠（Yuma hispid cotton rat）营造76英亩的栖息环境。目前学界认为这两种棉鼠的分布范围不存在重叠。截至当前，在特里戈山脉与巧克力山脉以南的帝国国家野生动物保护区区域，以及亚利桑那州尤马市以南区域捕获的个体均为尤马硬毛棉鼠；而在上述山脉以北区域捕获的个体均为科罗拉多河棉鼠。科罗拉多河棉鼠最北端的历史记录来自内华达州劳克林以南区域（Bradley 1966; Hall 1946）。2012年，科研人员在大弯保护地捕获到科罗拉多河棉鼠，这是该物种自1966年以来在内华达州的首次观测记录。荒漠小囊鼠栖息于美国西南部的三齿拉雷亚灌木（creosote bush, Larrea tridentata）群落与干旱河岸生境中，分布范围南至墨西哥下加利福尼亚州，北至加利福尼亚州东南部、内华达州南部及犹他州极西南部。其sobrinus亚种的分布范围尚未得到充分记录，据信该亚种仅分布于内华达州克拉克县境内，或可向南延伸至更远处。本次啮齿类调查中捕获的荒漠小囊鼠未进行亚种鉴定，无法确认其是否属于sobrinus亚种。每个多边形为特定样线/日期下所有诱捕点位的最小凸多边形（minimum convex polygon）。多边形的属性字段包含单次诱捕作业中各物种的捕获数量。RISE目录条目编号为#4228：https://data.usbr.gov/catalog/4024/item/4228。如需下载该数据集，请访问RISE地理空间开放数据平台：https://rise-usbr.opendata.arcgis.com/datasets/0dfb0ef37a5943f0b6eb48600aa2f73b