Introduction of alien species leading to unfavorable economic impacts and ecosystem collapse is a well-known threat. The aim was to define if high salinity may be a limiting factor for the survival and spread of the invasive crayfish Procambarus clarkii. Both sexes were exposed to increasing salt concentrations reaching 35.3‰ after 65 days to simulate the natural transition from freshwater into seawater. Higher mortality was recorded for salinity-treated females than for males. Condition indexes gave evidence of minor adverse effects, whereas altered values of oxidative stress biomarkers suggested a perturbation of redox state induced by the exposure conditions. The female survivors showed a strengthening of levels of oxidative stress biomarkers. A moderate oxidative pressure was recorded for gills in both sexes. Nevertheless, the non-indigenous red swamp crayfish has shown great resistance and adaptability to these simulated adverse environmental conditions. Survival of P. clarkii at high salinity may suggest that both sexes can be able to invade estuarine brackish water and lagoons initially exploited as ecological corridors, causing ecological imbalances in transitional ecosystems and in seawater. Moreover, this alien invasive species could be able to descend rivers up to the sea and vice versa to colonize new environments.

中文翻译：

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侵入性红沼泽小龙虾 Procambarus clarkii 的耐盐性（Girard，1852 年）

引入外来物种导致不利的经济影响和生态系统崩溃是众所周知的威胁。目的是确定高盐度是否可能是侵入性小龙虾 Procambarus clarkii 生存和传播的限制因素。65 天后，两性都暴露在不断增加的盐浓度中，达到 35.3‰，以模拟从淡水到海水的自然过渡。与男性相比，盐度处理的雌性记录到更高的死亡率。条件指数提供了轻微不利影响的证据，而氧化应激生物标志物的改变值表明暴露条件引起了氧化还原状态的扰动。女性幸存者表现出氧化应激生物标志物水平的增强。两性的鳃均记录到中等氧化压力。尽管如此，非本土红沼泽小龙虾对这些模拟的不利环境条件表现出极大的抵抗力和适应性。P. clarkii 在高盐度下的生存可能表明，两性都能侵入最初被用作生态廊道的河口咸水和泻湖，导致过渡生态系统和海水中的生态失衡。此外，这种外来入侵物种可以沿着河流流入大海，反之亦然，以在新环境中定居。造成过渡生态系统和海水中的生态失衡。此外，这种外来入侵物种可以沿着河流流入大海，反之亦然，以在新环境中定居。导致过渡生态系统和海水中的生态失衡。此外，这种外来入侵物种可以沿着河流流入大海，反之亦然，以在新环境中定居。