Schweizer Mona, Dieterich Andreas, Corral Morillas Núria, Dewald Carla, Miksch Lukas, Nelson Sara, Wick Arne, Triebskorn Rita, Köhler Heinz-R
1Animal Physiological Ecology, Eberhard Karls University of Tübingen, Auf Der Morgenstelle 5, 72076 Tübingen, Germany.
2Faculty of Biology, University of Barcelona, Diagonal, 643, 08028 Barcelona, Spain.
Environ Sci Eur. 2018;30(1):22. doi: 10.1186/s12302-018-0150-4. Epub 2018 Jun 20.
Although the crucial importance of sediments in aquatic systems is well-known, sediments are often neglected as a factor in the evaluation of water quality assessment. To support and extend previous work in that field, this study was conducted to assess the impact of surface water and sediment on fish embryos in the case of a highly anthropogenically influenced river catchment in Central Hesse, Germany.
The results of 96 h post fertilisation fish embryo toxicity test with (according to OECD Guideline 236) revealed that river samples comprising both water and sediment exert pivotal effects in embryos, whereas surface water alone did not. The most prominent reactions were developmental delays and, to some extent, malformations of embryos. Developmental delays occurred at rates up to 100% in single runs. Malformation rates ranged mainly below 10% and never exceeded 25%.
A clear relationship between anthropogenic point sources and detected effects could not be established. However, the study illustrates the critical condition of the entire river system with respect to embryotoxic potentials present even at the most upstream test sites. In addition, the study stresses the necessity to take into account sediments for the evaluation of ecosystem health in industrialised areas.
尽管沉积物在水生系统中的关键重要性广为人知，但在水质评估中，沉积物常被视为一个被忽视的因素。为了支持和扩展该领域之前的工作，本研究旨在评估在德国黑森州中部一个受人类活动高度影响的河流集水区中，地表水和沉积物对鱼类胚胎的影响。
根据经合组织准则236进行的受精后96小时鱼类胚胎毒性试验结果表明，包含水和沉积物的河流样本对胚胎有关键影响，而单独的地表水则没有。最显著的反应是发育延迟，在一定程度上还有胚胎畸形。单次试验中发育延迟发生率高达100%。畸形率主要低于10%，从未超过25%。
无法确定人为点源与检测到的影响之间的明确关系。然而，该研究表明，即使在最上游的测试地点，整个河流系统在胚胎毒性潜力方面也处于临界状态。此外，该研究强调了在工业化地区评估生态系统健康时考虑沉积物的必要性。
