生态多样性对有盐胁迫和无盐胁迫下浮萍生长的重要性

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Sofia J. van Moorsel
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引用次数: 5

摘要

淡水生态系统的污染正在威胁全球淡水植物物种的多样性。淡水植物,如常见的浮萍(小柠檬),可能对新的压力环境敏感。为了测试生态型多样性是否可以增加对胁迫环境的抵抗力,我使用了七个小L.minor种群,并在生态型多样性梯度上测量了它们在中度盐胁迫和不中度盐胁迫下的生长速率。小L.minor种群在92个实验性中生态系中生长了5个月,无论是在生态型单一培养中还是在与一个或三个同种生态型(23种独特成分)的混合培养中。在未受干扰的条件下生长浮萍(阶段1)后,将培养物置于中等盐胁迫(50mM NaCl)下数周(阶段2)。实验是在存在与不同生态型相关的天然差向微生物群落的情况下进行的。在第二阶段,这些藻类的一个子集给实验增加了无意的第二个压力源。不同生态型的生长速度不同,生长速度最快的是其他生态型的两倍。多样性背景进一步塑造了生态型的生长速率。在实验结束时,生态型复合栽培表现出更高的丰度,因此随着时间的推移,随着环境的恶化,生态型多样性变得越来越重要。这些发现表明,物种内生长速率的变化可以转化为生态型多样性对种群丰度的积极影响。轻度至中度盐水平的L.minor暴露对生长速率没有显著影响,尽管这种影响可能被盐水环境中藻类胁迫的减少所掩盖。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The importance of ecotype diversity on duckweed growth with and without salt stress
The pollution of freshwater ecosystems is threatening freshwater plant species diversity worldwide. Freshwater plants, such as the common duckweed (Lemna minor), are potentially sensitive to novel stressful environments. To test if ecotype diversity could increase resistance to stressful environments, I used seven L. minor populations and measured their growth rates with and without moderate salt stress across an ecotype diversity gradient. The L. minor populations were grown over five months in 92 experimental mesocosms, either in ecotype monocultures or in polyculture with either one or three conspecific ecotypes (23 unique compositions). After growing the duckweed in unperturbed conditions (phase 1), the cultures were subjected to moderate salt stress (50mM NaCl) for several weeks (phase 2). The experiment was conducted in the presence of the natural epimicrobial community associated with the different ecotypes. In phase 2, a subset of these algae added an unintentional second stressor to the experiment. The ecotypes differed in their growth rates, the fastest growing at twice the rate of others. The diversity context further shaped the ecotype growth rates. Ecotype polycultures showed higher abundances towards the end of the experiment, thus over time, as the environment deteriorated, ecotype diversity gained in importance. These findings show that within-species variation in growth rates can translate to a positive effect of ecotype diversity on population abundance. Exposure of L. minor to moderate salt levels did not significantly impact growth rates, although the effect may have been masked by reduced algal stress in the saline environments.
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来源期刊
Journal of Plant Ecology
Journal of Plant Ecology 生物-植物科学
CiteScore
4.60
自引率
18.50%
发文量
134
审稿时长
3 months
期刊介绍: Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.
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