SGS-LTER Long-Term Monitoring Project: Body weights of rodents captured during SGS-LTER live-trapping on the Central Plains Experimental Range, Nunn, Colorado, USA 1994 -2011, ARS Study Number 118

This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. Additional information and referenced materials can be found: http://hdl.handle.net/10217/83452.
Body size is a fundamental biological measurement that is known to be related to an organism's physiology, life-history and ecology. Estimates of body size are also widely used in comparative evolutionary and ecological studies, including food web and diet studies that require estimates of biomass. Beginning in 1994, small mammals are live-trapped twice each year on the three grassland and three shrubland trapping webs. Individuals are weighed (to nearest 0.5 g using a Pesola spring scale) when first captured during a given trapping session but not upon recapture during the same session. Weights are calculated by subtracting the weight of an empty capture (ziploc) bag from the weight of animal in the bag. Individuals are classified into age classes (adult, subadult, juvenile) in the field based on a combination of size and pelage characteristics. This dataset gives means, standard deviations, minimum and maximum values for body weight, in grams, of small mammals captured between September 1994 and September 2008. All sites and sampling periods were combined. Most individuals (~93%) were classified as new captures, although a few individuals that were captured multiple times across different trapping sessions may appear in the dataset more than once. Values may differ from estimates calculated using the entire capture dataset because age and weight data were screened more closely to omit obvious errors and outliers. Resources in this dataset:Resource Title: Website Pointer to html file. File Name: Web Page, url: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-sgs&identifier=138 Webpage with information and links to data files for download

本数据包由科罗拉多州立大学管理的短草草原长期生态研究（SGS-LTER）项目的研究人员制作。关于SGS-LTER项目的长期数据集及背景信息（提案、报告、照片等）均收录在科罗拉多州数字收藏馆的全面项目集中（http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429）。该数据表及其关联的元数据文档，采用生态元数据语言生成，可能通过服务生态研究社区的其它数据存储库获得，并代表SGS-LTER项目集的组成部分。更多信息及引用材料可查阅：http://hdl.handle.net/10217/83452。体型大小是生物学的基本测量指标，已知与生物体的生理机能、生命历史和生态学特征密切相关。体型估计值在比较进化生态学研究中也得到广泛应用，包括需要估算生物量的食物网和饮食研究。自1994年起，每年在三个草原和三个灌木丛捕捉网中两次活捉小型哺乳动物。在特定捕捉会话中首次捕获个体时进行称重（使用Pesola弹簧秤精确到0.5克），但不会在同一会话中再次捕获时进行称重。通过从包裹中动物的重量中减去空捕获（Ziploc）袋的重量来计算重量。个体根据体型和皮毛特征在野外根据年龄分类（成年、亚成年、幼年）。本数据集提供了1994年9月至2008年9月捕获的小型哺乳动物体重的平均值、标准偏差、最小值和最大值，单位为克。所有站点和采样期均合并。大多数个体（约93%）被归类为新捕获，尽管一些在多个捕捉会话中多次捕获的个体可能在数据集中出现多次。由于年龄和体重数据经过更严格的筛选以排除明显的错误和异常值，因此值可能与使用整个捕获数据集计算出的估计值不同。本数据集中的资源包括：资源标题：网站指针至html文件。文件名：网页，url：https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-sgs&identifier=138 包含信息和下载数据文件的链接网页。