The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea. 2. Historical Data for Use in Determination of Good Environmental Status
The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea. 2. Historical Data for Use in Determination of Good Environmental Status
复制标题
硅藻/甲藻指数作为波罗的海生态系统变化的指标。
DOI：
10.3389/fmars.2017.00153
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发表时间：
2017
影响因子：
3.7
通讯作者：
N. Wasmund
中科院分区：
文献类型：
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作者：
N. Wasmund
硅藻/甲藻指数（Dia/Dino指数）是在《海洋战略框架指令》范围内评估波罗的海生态状况的一个指标。描述了浮游植物春季华的优势模式。实施这一指标需要定义描述良好环境状况的条件。本研究的目的是根据波罗的海不同地区的浮游植物历史数据确定Dia/Dino指数的GES阈值。20世纪上半叶的数据，对应于富营养化前期，提供了一个完整的参考，如营养数据所示。早期的浮游植物数据显示，在春季的水华中，硅藻比鞭毛藻具有较高的优势。硅藻优势与Dia/Dino指数> 0.5有关，这使得东哥特兰盆地的GES阈值设定为Dia/Dino指数0.5。基尔湾和梅克伦堡湾一直非常高的Dia/Dino指数支持了之前提出的0.75的GES阈值。最近的监测数据显示Dia/Dino指数突然下降，特别是在1984年至1991年之间，因此环境状况恶化。这种恶化可以归因于气候变暖，而不是富营养化。
The diatom/dinoflagellate index (Dia/Dino index) serves as an indicator in the assessment of the ecological status of the Baltic Sea within the scope of the Marine Strategy Framework Directive. It describes the dominance patterns in the phytoplankton spring bloom. Implementation of this indicator requires a definition of the conditions describing good environmental status (GES). The aim of this study was to determine thresholds for GES for the Dia/Dino index on the basis of historical phytoplankton data from different regions of the Baltic Sea. Data from the first half of the 20th century, corresponding to the pre-eutrophication period, provide an unadulterated reference, as exemplified by nutrient data. Early phytoplankton data showed high dominance of diatoms over dinoflagellates in spring blooms. Diatom dominance relates to a Dia/Dino index > 0.5, which allowed GES threshold of the Eastern Gotland Basin to be set at a Dia/Dino index of 0.5. The consistently very high Dia/Dino index in Kiel and Mecklenburg Bays supported a previously suggested GES threshold value of 0.75. Recent monitoring data revealed a sudden decrease of the Dia/Dino index, especially between 1984 and 1991, and thus a worsening environmental status. This deterioration could be attributed to warming rather than to eutrophication.