Variation in growth, reproduction, and resource allocation in an aquatic plant, Vallisneria spinulosa: the influence of amplitude and frequency of water level fluctuations
Variation in growth, reproduction, and resource allocation in an aquatic plant, Vallisneria spinulosa: the influence of amplitude and frequency of water level fluctuations
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DOI：
10.1007/s00027-020-00754-8
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发表时间：
2020-09
期刊：
影响因子：
2.4
通讯作者：
Lei Li;M. Ding;E. Jeppesen
中科院分区：
文献类型：
--
作者：
Lei Li;M. Ding;E. Jeppesen
水位波动是受气候变化影响最大的生态驱动因子之一，是控制淡水生态系统中沉水植物生长和分布的主导力量。沉水植物是浅水湖泊的重要组成部分，因此预测它们对WLF的响应对于这些宝贵而脆弱的生态系统的管理和保护至关重要。在15个野外围隔生态系统中进行了实验，探讨了WLF对刺苦草生长性能的影响。我们使V. spinulosato WLF的两个振幅和两个频率，以稳定水位为对照，并测量了与生长，有性和无性繁殖以及资源分配有关的20个性状的变化。总体而言，与对照相比，水位波动对水生植物的生物量和生长产生不利影响，但使植物的高度和比叶面积增加，这有助于V. spinulosato高水位时期。WLF频率的变化对V的生长和繁殖影响不大。spinulosaplants除了他们的叶质量。相反，增加振幅不仅抑制地上部和根系的生长。刺葡萄对越冬无性繁殖体的分配相对稳定，能够维持无性繁殖能力。此外，随着WLF幅度的增加，刺葡萄将更多的资源投入到地下质量中，而牺牲了它们对叶质量的分配。我们的研究结果表明，在WFL的变化，特别是放大WLF幅度，由于气候变化，可能会严重影响沉水植物的生长和繁殖，对其他生物区系和浅水湖泊的生态状态的影响。
Water level fluctuations (WLF), one of the most affected ecological drivers by climate change, are dominant forces controlling submerged macrophyte performance and distribution in freshwater ecosystems. Submerged macrophytes are prominent components of shallow lakes, predicting their response to WLF is therefore crucial for the management and conservation of these valuable and vulnerable ecosystems. We conducted an experiment in 15 outdoor mesocosms to explore the influence of WLF on the performance ofVallisneria spinulosa. We subjectedV. spinulosato WLF of two amplitudes and two frequencies, with stable water level as a control, and measured variations in 20 traits related with growth, sexual and asexual reproduction and resource allocation. Generally, compared with the control plants, fluctuations in water level adversely affected macrophyte biomass and growth, but increased both height and specific leaf area, which are helpful for adaptation ofV. spinulosato high-water level periods. Changes in the WLF frequency had little effect on the growth and reproduction ofV. spinulosaplants apart from their leaf mass. In contrast, increased amplitude not only inhibited aboveground and root growth ofV. spinulosa, but also decreased investment in sexual reproduction by influencing fruit production.V. spinulosaheld a relatively stable allocation to overwintering asexual propagules in response to both components of WFL, which can maintain a capacity for clonal propagation following WLF. Moreover, as WLF amplitude increased,V. spinulosainvested a higher fraction of resources to belowground mass at the expense of their allocation to leaf mass. Our results suggest that shifts in WFL and especially magnified WLF amplitude due to climate change, may severely affect the growth and reproduction of submerged macrophytes with implications for other biota and the ecological state of shallow lakes.