1. Global trade in non-native ornamental species coupled with high connectivity among countries is well known to result in worldwide biological invasions, which pose challenges for the conservation and management of biodiversity.
2. There are few studies aimed at implementing management strategies that have examined differences in the potential invasiveness of non-native species between neighbouring political regions within the same ecoregion.
3. To compare the potential risk of invasiveness of non-native ornamental fishes with high commercial value in the river basins of two neighbouring regions of East and Southeast Asia, 32 extant and horizon species were screened with the aquatic species invasiveness screening kit (as-isk) for the lower Pearl River basin (South China) and the Chao Phraya River basin (Thailand). Both regional (i.e. basin level) and combined risk-ranking thresholds were determined by receiver operating characteristic curve analysis.
4. Of the 32 species screened, 14 were categorized as posing a high risk and seven were categorized as posing a medium risk of being invasive in both regions, under current and future climate conditions. These species have a history of invasiveness and the climate of their native ranges is similar to that of the two study regions. Pterygoplichthys pardalis received the highest risk score in both regions. The risk ranks of 11 species differed between the two regions, based on either the combined or regional thresholds, and this was partly related to the different risk of invasiveness between the two regions, coupled with cognitive subjectivity among the assessors.
5. The results of the present study suggest that the invasion of non-native ornamental fish species could pose similar threats to biodiversity in neighbouring regions. This will serve to inform policy makers of neighbouring countries in the development of coordinated, mutually beneficial regulations and management strategies to enhance the conservation of native species.

中文翻译：

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在当前和未来气候相似的邻近地区，非本地观赏鱼是否会造成相似程度的入侵风险？对保护和管理的影响

1. 众所周知，非本地观赏物种的全球贸易以及国家之间的高度连通性会导致全球生物入侵，这对生物多样性的保护和管理构成挑战。
2. 很少有研究旨在实施管理策略，以检查同一生态区域内相邻政治区域之间非本地物种的潜在入侵性差异。
3. 为比较东亚和东南亚两个邻近地区流域中具有较高商业价值的非本地观赏鱼的潜在入侵风险，使用水生物种入侵筛查套件（as-isk）对32种现存和地平线物种进行了筛查。珠江下游流域（华南）和湄南河流域（泰国）。区域（即流域水平）和组合风险等级阈值均由接收者操作特征曲线分析确定。
4. 在筛选的 32 个物种中，在当前和未来的气候条件下，有 14 个物种被归类为高风险物种，7 个物种被归类为在这两个地区具有中等入侵风险。这些物种有入侵历史，其原生地的气候与两个研究区域的气候相似。Pterygoplichthys pardalis在这两个地区都获得了最高的风险评分。基于组合阈值或区域阈值，两个区域之间 11 种物种的风险等级不同，这部分与两个区域之间的入侵风险不同，以及评估者的认知主观性有关。
5. 本研究的结果表明，非本地观赏鱼类物种的入侵可能对邻近地区的生物多样性构成类似的威胁。这将有助于周边国家的决策者制定协调、互利的法规和管理战略，以加强对本地物种的保护。