Shortgrass Steppe site, station USGS Bird Breeding Survey area 17901, Rockport, CO, study of animal abundance of Turdus migratorius in units of numberPerSightingEffort on a yearly timescale

The EcoTrends project was established in 2004 by Dr. Debra Peters
(Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and
Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest)
to support the collection and analysis of long-term ecological datasets.
The project is a large synthesis effort focused on improving the accessibility
and use of long-term data. At present, there are ~50 state and federally funded
research sites that are participating and contributing to the EcoTrends project,
including all 26 Long-Term Ecological Research (LTER) sites and sites funded by
the USDA Agriculture Research Service (ARS), USDA Forest Service,
US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal
(http://www.ecotrends.info). This web portal enables the continuation of data
compilation and accessibility by users through an interactive web application.
Ongoing data compilation is updated through both manual and automatic
processing as part of the LTER Provenance Aware Synthesis Tracking
Architecture (PASTA). The web portal is a collaboration between the Jornada LTER
and the LTER Network Office. The following dataset from Shortgrass Steppe (SGS)
contains animal abundance of Turdus migratorius measurements in numberPerSightingEffort units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（约拿盆地长期生态研究站（Long-Term Ecological Research, LTER），美国农业部农业研究服务局约拿实验牧场）与阿里尔·卢戈博士（卢奎约长期生态研究站（Long-Term Ecological Research, LTER），美国农业部森林服务局卢奎约实验森林）于2004年发起成立，旨在支撑长期生态数据集的采集与分析工作。
本项目为一项大型综合研究工作，核心目标是提升长期生态数据的可获取性与复用率。
目前共有约50个州级与联邦资助的科研站点参与并为EcoTrends项目贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research, LTER）站点，以及由美国农业部农业研究服务局（ARS）、美国农业部森林服务局、美国能源部、美国地质调查局（USGS）及众多高校资助的站点。
EcoTrends项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取，该门户依托交互式Web应用，支持用户持续开展数据整合与数据获取工作。
作为长期生态研究溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续的数据整合工作通过人工与自动处理相结合的方式进行更新。
该网络门户由约拿LTER站点与LTER网络办公室联合开发。
本次发布的短草草原（Shortgrass Steppe, SGS）数据集包含美洲知更鸟（Turdus migratorius）的种群丰度数据，其计量单位为numberPerSightingEffort，且已按年度时间尺度完成聚合。