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首页> 外文会议>International Symposium on Aquatic Weeds >Present distribution of the genus Elodea in the Alsatian Upper Rhine floodplain (France) with a special focus on the expansion of Elodea nuttallii St. John during recent decades
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Present distribution of the genus Elodea in the Alsatian Upper Rhine floodplain (France) with a special focus on the expansion of Elodea nuttallii St. John during recent decades

机译：在大型莱茵河洪泛区（法国）的目前分布于大型莱茵河（法国），特别关注近几十年来Elodea Nuttallii St. John的扩张

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摘要

Three species of Elodea (Elodea canadensis Michaux, E. nuttallii St John and E. ernstiae St John) have colonized Europe from the American continent. All three arrived in the Alsatian Rhine floodplain (northeastern France) soon after their arrival in Europe, i.e. in the mid-19th century for E. canadensis, and in the mid-20th century for E. nuttallii and E. ernstiae. The paper investigates the present distribution of Elodea spp. in the floodplain by quantifying the species' respective occurrences and by describing their habitats. The study further focuses on E. nuttallii which is presently colonizing other parts of Europe. It analyses whether it has continued to expand in the Alsatian Rhine floodplain during recent decades, and it checks whether changes in the abundance of E. nuttallii have had an impact on species richness of water plant communities. E. nuttallii has been found to be at present one of the most dominant and most frequent aquatic plant species in the study sector, while E. canadensisand E. ernstiae are less abundant. The species' distributions differ with regard to water chemistry and water temperature: E. canadensis occurs in oligo-mesotrophic, rather stenothermic habitats, whereas E. nuttallii and E. ernstiae can be encountered inmeso-to eutrophic sites with little or no arrival of stenothermic ground water. By comparing successive vegetation releves from the same sites the study revealed further that the distribution of E. nuttallii has been stable in recent decades, despite local fluctuations in abundance. No relationship could be established between those fluctuations and changes in species richness or type of local plant communities. The sum of the results suggests that the expansion of E. nuttallii in the Alsatian Rhine floodplain had been completed prior to the study period. The species' present distribution in the study sector as well as its position in local plant communities might therefore be considered a model for what can be expected to happen in areas where E. nuttallii has only recently arrived.
机译：三个品种的伊乐藻（伊乐藻米肖，伊乐藻圣约翰和E. ernstiae圣约翰）从美洲大陆的殖民统治欧洲。所有三个人在抵达欧洲时，即将抵达阿尔萨斯莱茵河洪泛省（东北部），即在19世纪中期为E. Canadensis，并在20世纪中期的E. Nuttallii和E.Ernstiae。本文研究了ELODEA SPP的目前分布。通过量化物种各自的出现并通过描述他们的栖息地来在洪泛区。该研究进一步侧重于E. Nuttallii，目前殖民地殖民欧洲其他地区。它分析了近几十年来在阿尔萨斯莱茵河洪泛区进行了展开，并检查了E. Nuttallii丰富的变化是否对水厂社区的物种具有影响。 E.藻已被发现是在研究领域最具优势，最常见的水生植物物种的存在之一，而E. canadensisand E. ernstiae不太丰富。物种的分布在水化学和水温方面不同：E. Canadensis在寡核苷酸，相当稳定的栖息地中发生，而E. Nuttallii和E.Ernstiae可以遇到inmeso-to Eutrophic网站，几乎没有稳定的东西地面水。通过比较来自同一部位的连续植被相关，该研究揭示了近几十年来的E. Nuttallii的分布稳定，尽管是丰富的局部波动。在这些波动和物种丰富性或当地植物社区类型的变化之间没有任何关系。结果的总和表明，在研究期之前已经完成了在阿尔萨斯莱茵河洪泛区的E. Nuttallii的扩张。因此，该物种在研究部门的目前分布以及其在当地植物群落中的立场可能被视为可以在E. Nuttallii最近抵达的地区的预期发生。

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