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首页> 美国卫生研究院文献>Evolutionary Applications >Hybrid watermilfoil lineages are more invasive and less sensitive to a commonly usedherbicide than their exotic parent (Eurasian watermilfoil)
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Hybrid watermilfoil lineages are more invasive and less sensitive to a commonly usedherbicide than their exotic parent (Eurasian watermilfoil)

机译：杂种水银花谱系对常用的更具侵入性且不那么敏感除草剂比其外来母体（欧亚水草）

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Hybridization may stimulate the evolution of invasiveness in human-impacted habitats if unique hybrid genotypes have higher fitness than parental genotypes. Human efforts to control invasive taxa frequently involve the intentional alteration of habitats, but few studies have considered whether hybridization can result in decreased sensitivity to control measures. Here, we investigate whether interspecific hybrids between introduced Eurasian watermilfoil (Myriophyllum spicatum) and native northern watermilfoil (M. sibiricum) are more invasive than parental Eurasian watermilfoil, especially in regard to their relative responses to an herbicide commonly applied for their control (2,4-dichlorophenoxyacetic acid; 2,4-D). In two separate laboratory experiments, hybrids on average grew faster and were less sensitive to 2,4-D compared with parental Eurasian watermilfoil. These two invasive traits appear to be common in hybrid watermilfoils, as opposed to being restricted to a few unique lineages, because they were found in a diversity of hybrid genotypes from several independent hybridization events. In addition, we found that hybrids occurred more frequently than parental species in natural lakes previously treated with 2,4-D. Our results provide compelling empirical evidence that hybridization is associated with the evolution of increased invasiveness in watermilfoils, and have important implications for their management.
机译：如果独特的杂种基因型比亲本基因型具有更高的适应性，杂交可能会在人类影响的栖息地中刺激侵袭性的进化。人类控制侵入性分类单元的努力通常涉及栖息地的故意改变，但是很少有研究考虑杂交是否会导致对控制措施的敏感性降低。在这里，我们调查引入的欧亚水草（Myriophyllum spicatum）和本地北方水草（M. sibiricum）之间的种间杂种是否比亲本欧亚水草更具侵入性，特别是在它们对通常用于其控制的除草剂的相对反应方面（2， 4-二氯苯氧基乙酸； 2，4-D）。在两个单独的实验室实验中，与亲本欧亚水母相比，杂种平均增长更快，并且对2,4-D的敏感性更低。这两个侵入性状似乎在杂种小水fo中很常见，而不是局限于少数独特的血统，因为它们是在来自几个独立杂交事件的各种杂种基因型中发现的。此外，我们发现在以前用2,4-D处理过的天然湖泊中，杂种比亲本物种发生的频率更高。我们的结果提供了令人信服的经验证据，表明杂交与水蚕侵袭力的增强有关，并且对其管理具有重要意义。

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