1. Desiccation resistance is a key trait determining the distribution of aquatic insects, their potential for overland dispersal, and survival during drought periods in temporary waterbodies, as well as the spread of invasive species. Passive dispersal by waterbirds is considered to be a key process favouring the spread of invasive species and is more likely to occur for insects with eggs that are resistant to desiccation or gut passage.
2. We investigated the hypothesis that the eggs of the alien boatman Trichocorixa verticalis verticalis are resistant to desiccation and digestion and thus able to disperse via waterbirds.
3. We conducted experiments to test for egg resistance to desiccation in still air and under moving air conditions, to simulate bird flight. Oviposition on greater flamingo (Phoenicopterus roseus) legs and wetland plants was tested in the laboratory and in the field. Resistance of eggs to simulated gut passage was studied, as was the viability of eggs recovered from Eurasian coot (Fulica atra) droppings in the field.
4. Only a fraction of eggs hatched after 8 hr of exposure to still air at 15°C (4% of exposed eggs), and after 2 hr exposure to air flow conditions at 20°C (8%). Oviposition on flamingo legs was confirmed in the laboratory but not in the field. However, oviposition rates were higher on plant stems than on flamingo legs. Digestion simulations showed very low resistance to chemical treatment and no resistance to scarification, and eggs recovered from coot droppings did not hatch.
5. Our experiments demonstrated that T. v. verticalis cannot be considered to have eggs resistant to desiccation or gut passage. However, the dispersal of eggs on legs of flamingos or other waterbirds may occur as rare events. This epizoochory of eggs could potentially contribute to the expansion and gene flow of T. v. verticalis around the Mediterranean region.

中文翻译：

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外来水船夫Trichocorixa Verticalis Verticalis（Hemiptera，Corixidae）的繁殖是否受到动物防虫和抗旱卵的辅助？

1. 耐干燥性是决定水生昆虫分布，其在陆地上扩散的潜力，临时水体在干旱时期生存以及入侵物种扩散的关键特征。水鸟的被动扩散被认为是促进入侵物种扩散的关键过程，对于带卵的昆虫来说，更容易发生这种现象，而卵具有抗干燥性或肠道抵抗力。
2. 我们调查了外来船夫Trichocorixa Verticalis Verticalis的卵对干燥和消化具有抵抗力并因此能够通过水鸟传播的假说。
3. 我们进行了实验，以测试鸡蛋在静止空气和移动空气条件下的抗干燥性，以模拟鸟类的飞行。在实验室和野外测试了大火烈鸟（Phoenicopterus roseus）腿和湿地植物上的产卵情况。研究了鸡蛋对模拟肠道的抗性，以及从田间从欧亚老傻瓜（Fulica atra）粪便中回收的鸡蛋的生存力。
4. 在15°C的静止空气中暴露8小时（占暴露的卵的4％）以及在20°C的空气流动条件暴露2小时（8％）后，只有一小部分的卵孵化。在实验室中已确认在火烈鸟腿上产卵，但未在现场确认。但是，植物茎上的产卵率比火烈鸟腿上的高。消化模拟显示对化学处理的抵抗力很低，对划痕的抵抗力很低，从白骨鸡粪中回收的卵也没有孵化。
5. 我们的实验表明，不能认为T. v。Verticalis具有抗干燥或肠道通过的能力。但是，鸡蛋散布在火烈鸟或其他水鸟的腿上可能是罕见的事件。卵的这种生硬性可能会促进地中海地区垂直烟草的扩展和基因流动。