The production and release of chemical compounds by invasive plants can affect competitors and native species overall, destabilizing ecological interactions and harming ecosystem functioning. Hedychium coronarium is an invasive macrophyte common on Brazilian riparian areas that produces a wide variety of allelochemicals, but little is known about their effect on aquatic species. Here, we identified the major chemical compounds of the aqueous extract of H. coronarium rhizomes and assessed its toxicity, evaluating the growth inhibition of one alga (Raphidocelis subcapitata) and one macrophyte (Lemna minor), and the lethality of cladoceran (Ceriodaphnia silvestrii and Daphnia similis) and Chironomidae larvae (Chironomus sancticaroli). The majoritarian compounds of H. coronarium rhizomes were Coronarin D and Coronarin D Ethyl Ether. The aqueous extract was toxic for all tested species. We observed growth inhibition in R. subcapitata, as well as reduction in biomass in L. minor. Chironomus sancticaroli and cladoceran were the most sensible species. The aqueous extract of H. coronarium rhizomes was toxic on tested conditions, suggesting that the rhizome compounds may interfere on aquatic organisms and in the dynamic of trophic webs of aquatic ecosystems on invaded areas.

入侵植物产生和释放化学化合物会整体上影响竞争者和本地物种，破坏生态相互作用并损害生态系统功能。Hedychium coronarium是巴西河岸地区常见的一种入侵性大型植物，可产生多种化感化学物质，但对其对水生物种的影响知之甚少。在这里，我们确定了H. coronarium根茎水提取物的主要化学成分，并评估了其毒性，评估了一种藻类（Raphidocelis subcapitata）和一种大型植物（Lemna minor）的生长抑制作用，以及锁骨蓝（Ceriodaphnia silvestrii和水蚤）和Chironomidae幼虫（Chironomus sancticaroli）。冠状血红素根茎的主要化合物是Coronarin D和Coronarin D乙基醚。水提取物对所有测试物种均具有毒性。我们观察到了R. subcapitata的生长抑制，以及L. minor的生物量减少。Chironomus sancticaroli和cladoceran是最明智的物种。冠状杆菌冠状茎的水提物在测试条件下是有毒的，这表明该根茎化合物可能干扰水生生物以及入侵区域水生生态系统的营养网的动态。