AA.I3L10, AA.J3L10, AB.I3L10 and AB.J3L10 (NT)

Summary Estimated observations of the biotope AA.I3L10, AA.J3L10, AB.I3L10 and AB.J3L10 were collected from the Baltic Sea area by expert judgements for HELCOM Red List of biotopes, habitats and biotope complexes. Description Baltic photic or aphotic coarse sediment or sand dominated by multiple infaunal bivalve species: Macoma calcarea, Mya truncata, Astarte spp., Spisula spp. The HELCOM Red List of Baltic Sea underwater biotopes, habitats and biotope complexes (2013) is an updated and improved version of the Red List assessment of marine and coastal biotopes and biotope complexes published in 1998. The classification of the report follows the proposed International Union for Conservation of Nature (IUCN) criteria and assessment principals but with some modifications for the Baltic Sea.Altogether, the HELCOM Underwater Biotope and habitat classification (HELCOM HUB) includes 209 biotopes of which 59 were red-listed. Many of the red-listed biotopes are located in deep areas of the Baltic Sea due to oxygen-free nature as well as in the southwestern Baltic Sea due to the salinity restricted distribution of species in certain biotope. The HELCOM assessment relies heavily on expert judgment and inference, and the questionnaire data represents the estimated presence-absence data not in-situ measured data. This must be taken in account when observing the map presentation. The biotopes are shown on the map using the EEA 100 km grid. This dataset displays estimated presence of AA.I3L10, AA.J3L10, AB.I3L10 andAB.J3L10according to HELCOM RED LIST assessment experts:Kiel bight to Isle of Fehmarn, might occasionally occur in Mecklenburg Bight to Darss sill, South-westernBaltic Sea. The distribution map indicates the area in the 100 x 100 km grid where biotope is known tooccur.AA.I3L10, AA.J3L10, AB.I3L10 andAB.J3L10have been placed in the Red List classification to the category of Near Threatened (NT) biotopes. (Data (expert judgements) collected in HELCOM RED LIST project, released in May 2013)摘要 本数据集汇总了赫尔辛基委员会（HELCOM）生物群落生境、栖息地及生物群落生境复合体红色名录项目中，经专家研判从波罗的海海域收集得到的AA.I3L10、AA.J3L10、AB.I3L10及AB.J3L10四类生物群落生境的估算观测数据。 描述 该类生境为波罗的海透光或无光环境下以粗沉积物或沙质底质为主的海域，优势类群为多种底栖双壳类：钙质樱蛤（Macoma calcarea）、截尾蛤（Mya truncata）、星蛤属（Astarte spp.）及楔形蛤属（Spisula spp.）。 《2013年波罗的海水下生物群落生境、栖息地及生物群落生境复合体红色名录》是对1998年发布的海洋与海岸生物群落生境及生物群落生境复合体红色名录评估的更新优化版本。本报告的分类体系遵循国际自然保护联盟（IUCN）提出的评估标准与原则，但针对波罗的海海域进行了部分调整。 整体而言，赫尔辛基委员会水下生物群落生境与栖息地分类体系（HELCOM HUB）共包含209类生物群落生境，其中59类被纳入红色名录。由于部分海域存在无氧环境，且部分生物群落生境中的物种分布受盐度限制，多数红色名录收录的生物群落生境分布于波罗的海深海区域及波罗的海西南部海域。 赫尔辛基委员会的此次评估高度依赖专家研判与推断，问卷数据为估算的物种存在/缺失数据，而非原位实测数据。查看该数据集的地图展示时，需注意这一点。该数据集的生物群落生境分布以欧洲环境署（EEA）100公里×100公里网格进行标注。 本数据集展示了经赫尔辛基委员会红色名录评估专家估算的AA.I3L10、AA.J3L10、AB.I3L10及AB.J3L10四类生物群落生境的潜在分布区域：基尔湾（Kiel Bight）至费马恩岛（Isle of Fehmarn）海域，偶见于梅克伦堡湾（Mecklenburg Bight）至达斯水道（Darss sill）的波罗的海西南部海域。该分布地图标注了100公里×100公里网格中已确认存在该类生境的区域。 AA.I3L10、AA.J3L10、AB.I3L10及AB.J3L10四类生物群落生境均被列入红色名录的近危（Near Threatened, NT）类别。 （数据为赫尔辛基委员会红色名录项目于2013年5月发布的专家研判结果）