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Flood dynamics dictate distributions of Elaeagnus angustifolia L. (Russian olive) on a riverine floodplain
Biological Invasions ( IF 2.9 ) Pub Date : 2020-09-10 , DOI: 10.1007/s10530-020-02352-z
Natalie M. West , Ann Marie Reinhold , Geoffrey C. Poole , Erin K. Espeland

North American invasions of Elaeagnus angustifolia L. (Russian olive) are still expanding, and hydrochory could be increasing invasion impacts along rivers. Spatial association between riverine flood-inundation patterns and E. angustifolia distributions suggests a link between seed movement potential and invasion patterns in time and space. Using output from hydraulic inundation models, we mapped inundation zones associated with successive flood return intervals within 10.81 km2 of the estimated 500-year floodplain of the Yellowstone River, Montana, USA. We then evaluated spatial relationships among inundation zones and E. angustifolia distribution. Elaeagnus angustifolia was highly spatially associated with frequent flood return intervals: 80% of E. angustifolia exists within a subset of the floodplain predicted to flood every 10 years or less, with the highest occupancy in the 1.5- to 5-year return zones. Within frequently inundated areas, floodplain occupancy of E. angustifolia was distributed in patterns consistent with likely areas of sediment deposition. Thus, existing predictions of invasion timelines are likely to improve with explicit consideration of dispersal opportunities associated with hydrochory during flooding. In particular, if hydrochory is a significant secondary dispersal mechanism, then seed immigration at flood intervals of 5 years or less could lead to substantially shorter invasion lags than currently predicted.



中文翻译:

洪水动力学决定了河滨洪泛区上的沙枣(Elaeagnus angustifolia L.(Russian olive))的分布

北美入侵者Elaeagnus angustifolia L.(俄罗斯橄榄)的入侵仍在扩大,而水耕法可能会增加对河流的入侵影响。河流洪水淹没模式与大叶桉的分布之间的空间联系暗示了种子移动潜力与时空入侵模式之间的联系。利用水力淹没模型的输出,我们在美国蒙大纳州黄石河估计500年洪泛区的10.81 km 2内,绘制了与连续洪灾返回间隔相关的淹没区。然后,我们评估了淹没区与E. angustifolia分布之间的空间关系。沙枣(Elaeagnus angustifolia)与频繁的洪灾回返间隔在空间上高度相关:预计在每10年或更短的时间内洪泛区的一部分中,有80%的沙棘肠杆菌存在,在1.5至5年的回洪区中占有率最高。在经常淹没区,滩区占用沙枣分布在与泥沙淤积的可能领域是一致的图案。因此,通过明确考虑洪水期间与水力发力相关的扩散机会,现有的入侵时间表预测可能会得到改善。特别是,如果水耕法是重要的二次扩散机制,则以5年或更短的洪水间隔进行种子迁移可能会导致入侵滞后时间大大短于目前的预测。

更新日期:2020-09-11
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