Combined effects of shading and clipping on the invasive alien macrophyte Elodea nuttallii
Combined effects of shading and clipping on the invasive alien macrophyte Elodea nuttallii
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DOI：
10.1016/j.aquabot.2018.11.014
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发表时间：
2019-03-01
期刊：
影响因子：
1.8
通讯作者：
Hilt, Sabine
中科院分区：
文献类型：
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作者：
He, Liang;Bakker, Elisabeth S.;Hilt, Sabine
淡水生态系统中的水生植物对食草动物和割草的反应是模糊的。最近的一项研究的基础上的植物生长模型和荟萃分析的实地研究表明，沉水植物更容易被植物去除草食动物时，另外遮荫的附着生物。在这里，我们测试遮荫和食草动物或割草的这种协同效应是否可以通过实验证实。我们使用伊乐藻，欧洲最受关注的外来入侵物种之一。它是食草性水鸟的首选物种，并作为一种常见的管理措施受到修剪。我们暴露了E。nuttallii到四个层次的剪辑，有和没有额外的阴影。研究结果表明，遮荫和修剪对最终株高有协同效应。nuttallii和生物量的加性效应，因为增强的分支补偿了阴影处理中修剪造成的地上部生物量损失。我们的研究结果表明，遮荫可能有助于保持较低的冠层高度E nuttallii时，水禽放牧或修剪，但不协同减少植物总生物量。我们的结论是，水生植物的响应，以综合应力的阴影和草食动物或割草可以不同的生长参数和物种之间，是重要的考虑在水生植物管理。
The response of macrophytes to herbivory and mowing in freshwater ecosystems is ambiguous. A recent study based on a plant growth model and a meta-analysis of field studies suggested that submerged macrophytes are more susceptible to plant removal by herbivory when additionally shaded by periphyton. Here, we test whether such synergistic effects of shading and herbivory or mowing can be experimentally confirmed. We used Elodea nuttallii, one of the alien invasive species of the highest concern in Europe. It is a preferred species by herbivorous water birds and is subject to mowing as a common management measure. We exposed E. nuttallii to four levels of clipping, with and without additional shading. Our results show a synergistic effect between shading and clipping for final shoot height of E. nuttallii and an additive effect for biomass, as enhanced branching compensated for shoot biomass losses by clipping in shaded treatments. Our results indicate that shading may help to maintain a lower canopy height of E nuttallii when grazed by water birds or mown, but does not synergistically reduce total plant biomass. We conclude that the response of aquatic macrophytes to combined stress by shading and herbivory or mowing can differ among growth parameters and among species and is important to consider in aquatic plant management.