Parched plants: survival and viability of invasive aquatic macrophytes following exposure to various desiccation regimes
Parched plants: survival and viability of invasive aquatic macrophytes following exposure to various desiccation regimes
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DOI：
10.1016/j.aquabot.2018.06.001
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发表时间：
2018-11-01
期刊：
影响因子：
1.8
通讯作者：
Jansen, Marcel A. K.
中科院分区：
文献类型：
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作者：
Coughlan, Neil E.;Cuthbert, Ross N.;Jansen, Marcel A. K.
外来入侵物种在世界范围内对自然和半自然生态系统构成严重威胁。尽管更多的移动性生物或人类活动可以促进入侵水生植物的成功陆路运输，但对干燥的耐受性可能是一个限制因素。特别是在营养的碎片化繁殖的情况下。在这里，我们研究了两个漂浮的(满江红、小浮萍)和三个沉水的(加拿大伊洛迪亚)茎段的整个植株的存活和随后的活力(即通过产生新的茎或根生长来再生)。在暴露于不同的干燥制度后，入侵的大型植物。将物种暴露在选定的温度(20、27、36摄氏度)和相对湿度(18、38、60、85%RH)组合中长达6小时。一般来说，漂浮植物表现出比沉水物种更大的存活率和生存能力。总体而言，随着干燥暴露时间的增加，所有物种的存活率和生存能力都显著下降。从本质上讲，水生植物蒸气压亏差的增加显著降低了水生植物的存活率。尽管湿度的降低特别降低了存活率和生存能力，但观察到温度的升高会增强某些湿度处理的影响。尤其是当暴露在低相对湿度(
Invasive alien species represent a serious worldwide threat to natural and semi-natural ecosystems. Although successful overland transport of invasive aquatic macrophytes can be facilitated by more mobile organisms or anthropogenic activity, tolerance to desiccation is likely a limiting factor. Particularly in the case of vegetative fragmentary propagules. Here we examined survival and subsequent viability (i.e. regeneration by production of new shoot or root growth) for whole plantlets of two floating (Azolla filiculoides, Lemna minuta) and stem fragments of three submerged (Elodea canadensis. E. nuttallii, Lagarosiphon major) invasive macrophytes following exposure to different desiccation regimes. Species were exposed to selected temperature (20, 27, 36 degrees C) and relative humidity (18, 38, 60, 85% RH) combinations for up to six hours. In general, floating plants displayed greater survival and viability than submerged species. Overall, survival and viability decreased significantly for all species with increased desiccation exposure times. In essence, increased vapour-pressure deficit significantly reduced survival of aquatic plants. Although reduced humidity rates particularly decreased survival and viability, increased temperatures were observed to bolster the impact of certain humidity treatments. In particular, when exposed to low RH (