North Temperate Lakes site, station Big Muskellunge Lake, study of animal abundance of Orconectes in units of numberPerEffort 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 North Temperate Lakes (NTL)
contains animal abundance of Orconectes measurements in numberPerEffort units
and were aggregated to a yearly timescale.

生态趋势（EcoTrends）项目由黛布拉·彼得斯博士（乔达纳盆地长期生态研究站点，美国农业部农业研究局（USDA-ARS）乔达纳实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站点，美国农业部林务局（USDA-FS）卢奎洛实验林）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。本项目为大型综合研究计划，致力于提升长期生态数据的可获取性与应用价值。目前共有约50个州级与联邦资助的研究站点参与并贡献数据至生态趋势项目，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局（ARS）、美国农业部林务局、美国能源部、美国地质调查局（USGS）及众多高校资助的站点。生态趋势项目的数据集可通过探索式Web门户（http://www.ecotrends.info）获取，该门户依托交互式Web应用程序，支持用户持续开展数据整合与访问操作。作为长期生态研究站点溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续推进的数据整合工作通过手动与自动两种处理方式完成更新。该Web门户由乔达纳LTER站点与LTER网络办公室合作开发。本数据集取自北温带湖泊（North Temperate Lakes, NTL）站点，包含螯虾属（Orconectes）的种群丰度实测数据，单位为numberPerEffort，且已按年度时间尺度完成聚合。