WFD Cycle 2 Invasive non native species over ride classification

This dataset is a subset of the "WFD Classification Status Cycle 2" dataset. Water bodies classified at High Ecological Status undergo an additional check for the presence of Invasive Non-Native Species (INNS). If records show presence of INNS the status class of the water body is downgraded to Good Status. The following criteria have been used to assess INNS:
 Records of INNS must be recent (from within the usual 3-year data window used for biological sampling). Historic records have not been used to downgrade water body status even if are no more recent records to suggest the INNS are no longer present.
 Records of INNS must be from within the water body classified as High Status, not neighbouring water bodies or nearby regions of land/water.
 Species must be on the current UK TAG list of high impact species (appended) Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.

本数据集系“WFD 分类状态循环 2”数据集的子集。处于高生态状态的流域需经过对入侵性非本地物种（INNS）存在的额外核查。若记录显示存在 INNS，则该水体的状态类别将被降级至良好状态。评估 INNS 所采用的以下标准：
 INNS 的记录必须为近期记录（须在生物采样通常使用的 3 年数据窗口内）。即使没有更近期的记录表明 INNS 已不存在，历史记录亦未被用于降低水体的状态类别。
 INNS 的记录必须来自被归类为高状态的水体，而非邻近的水体或周边陆地/水域。
 物种必须位于当前英国 TAG 列表中具有高影响物种（附后）。
归属声明：© 环境署版权及/或数据库权利 2015。版权所有。