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Role of hydrological and hydromorphological factors in ecological quality of medium-sized lowland streams

机译：水文和形态学因素在中型低地河流生态质量中的作用

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摘要

The development of biological communities is an important research issue regarding biological quality elements. However, it is still uncertain how different organism groups and their metrics are affected by different environmental factors. A study of high-quality sites of medium-sized lowland streams typical for Latvia (ecoregion Baltic province) was carried out with an emphasis on hydrological and hydromorphological characteristics. The investigations were carried out within the STAR project using the project designated standard methods. We found that the level of saprobity according to benthic macroinvertebrates was mainly linked with substrate type and stream depth. The trophic diatom index for diatoms on a soft substratum had a negative correlation with altitude and a positive correlation with distance from the source and also stream depth. There were no significant correlations between macrophyte trophic indices and environmental factors associated with stream hydrological conditions. The European fish index was influenced mainly by stream width and distance from the source, which agrees with the results of other researchers, In general, a direct or indirect role of hydrological and hydromorphological factors was evident in the forming of communities characterizing stream ecological quality.
机译：生物群落的发展是有关生物质量要素的重要研究问题。但是，仍然不确定不同的环境因素如何影响不同的生物体及其指标。对拉脱维亚（波罗的海生态区）典型的中型低地溪流的高质量地点进行了研究，重点是水文和水文形态特征。调查是在STAR项目内使用项目指定的标准方法进行的。我们发现，底栖大型无脊椎动物的腐烂程度主要与基质类型和水流深度有关。软质基质上硅藻的营养硅藻指数与海拔高度呈负相关，与到源的距离以及河流深度也呈正相关。大型植物的营养指数与与河流水文条件有关的环境因素之间没有显着相关性。欧洲鱼类指数主要受河流宽度和距水源距离的影响，这与其他研究人员的研究结果一致。总的来说，水文和水文形态因素的直接或间接作用在表征河流生态质量的群落形成中很明显。

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