自1990年以来,特别是,《水框架指令》实施后,亲生态项目的许多积极影响是显而易见的;不幸的是,也观察到了副作用的例子。这项研究旨在表明一些不明智的行为,叫做“亲生态”,可能导致栖息地退化和有价值的水生生物物种的消失。两条水道,代表低地砾石流和砂流类型,被选中进行研究。文献表明,在过去,这些水道的特点是良好的生态状况和有价值的流变动植物。记录环境参数,对大型无脊椎动物和鱼类动物进行了采样和分析,最后,计算了指数。将结果与文献数据进行比较。在2011-2015年进行的研究过程中,观察到鱼类和水生无脊椎动物的栖息地急剧恶化和物种结构的广泛变化。Smolnica溪流的变化是由2000年沿中下游建造的三个滞留盆地引起的;而在Kiszewko,然而,栖息地恶化的因素与欧亚海狸(蓖麻纤维)的过度扩张有关,创造了一个20米宽的海狸池塘,蓄水高度高达2m。
Since 1990 and in particular, after the implementation of the Water Frame Directive, many positive effects of pro-ecological projects are evident; unfortunately, examples of adverse effects have also been observed. This study aims to indicate how some ill-considered actions, called \"pro-ecological\", may lead to habitat degradation and the disappearance of valuable hydrobiont species. Two watercourses, representing the lowland gravel stream and sandy stream type, were selected for the study. Literature indicated that in the past, these watercourses were characterized by an excellent ecological status and the presence of valuable rheophilic fauna and flora. Environmental parameters were recorded, macroinvertebrates and ichthyofauna were sampled and analyzed, and finally, indexes were calculated. The results were compared with literature data. In the course of studies conducted in 2011-2015, drastic habitat deterioration and extensive changes in the species structure of ichthyofauna and aquatic invertebrates were observed. Changes in the Smolnica stream have been caused by the three retention basins constructed in 2000, along the lower and middle course; while in Kiszewko, however, the factor for habitat deterioration was connected with the excessive expansion of the Eurasian beaver (Castor fiber), which created a beaver pond 20 m in width, with impoundment elevations of up to 2 m.