This paper presents an overview of introduced alien plant species inhabiting natural thermal waters of Serbia. We recorded the presence of six naturalised aquatic plant species, also recognised as weeds in several regions of the world. This was the first time that Heteranthera zosterifolia (Pontederiaceae), Lemna minuta (Araceae) and Rotala rotundifolia (Lythraceae) were recorded in the aquatic ecosystems of Serbia. In addition, the presence of H. zosterifolia and R. rotundifolia was previously unknown in other countries of Southeastern Europe. The study includes detailed habitat descriptions and impact assessments for all introduced aquatic species in thermal waters in Serbia. All species were prioritised for pest risk analysis using a modified version of the EPPO prioritisation process within the framework of the EU regulation for invasive species. As a result, four alien species may be considered invasive (three at EU and one at national level), while two other species did not show strong invasiveness, but still need to be monitored. In addition, risk management measures were proposed for all invasive species from this study, and they may provide implications for the theory and practical management of weeds.

中文翻译：

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塞尔维亚温泉水域记录的外来植物风险分析

本文概述了居住在塞尔维亚天然温泉水中的外来植物物种。我们记录了六种已归化的水生植物物种的存在，这些物种在世界多个地区也被视为杂草。这是在塞尔维亚的水生生态系统中首次记录到杂种菊科植物（Pontederiaceae），细翅目Lemna minuta（天南星科）和轮状Rotata rotundifolia（菊科）。此外，存在zosterifolia和R. rotundifolia在东南欧其他国家以前是未知的。该研究包括对塞尔维亚温泉水中所有引入的水生物种的详细栖息地描述和影响评估。在欧盟针对入侵物种的法规框架内，使用经过修改的EPPO优先排序流程，对所有物种进行了优先有害生物风险分析。结果，四种外来物种可能被认为是入侵物种（欧盟有3种，国家一级是外来物种），而另外两种没有显示出强入侵性，但仍需进行监测。此外，本研究针对所有入侵物种提出了风险管理措施，这些措施可能对杂草的理论和实际管理提供启示。