Guillaume Delhaye, Panayiotis G. Dimitrakopoulos, George C. Adamidis
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We quantified the proportion of variance explained by inter‐ and intraspecific trait differences and tested if individual species showed changes in trait values explained by soil Ni content. We investigated the adaptive value and the community level changes for each trait along the natural soil Ni gradient using a mixed model approach and functional diversity analyses. We tested the role of the abundant serpentine endemic and Ni‐hyperaccumulating species <jats:italic>Odontarrhena lesbiaca</jats:italic> in driving these patterns.</jats:list-item> <jats:list-item>Intraspecific variation explained by soil Ni content is smaller than 4%, and most of the variance is explained by interspecific differences in trait values. Most species do not show significant changes in trait values in response to soil Ni. At the community level, low specific leaf areas, small and thick leaves are selected on high Ni soils. Functional diversity analyses suggest a shift towards a stress tolerance syndrome (thick and small leaves with low SLA values) and an increase in functional diversity on Ni‐rich soils. However, these patterns are driven by the increasing abundance of <jats:italic>O. lesbiaca</jats:italic>.</jats:list-item> <jats:list-item>The endemic Ni hyperaccumulator has a stress tolerance strategy with small thick leaves and low SLA, while the community of broadly distributed species show an increase in trait values related to dominance and fast growth.</jats:list-item> <jats:list-item><jats:italic>Synthesis</jats:italic>. Intraspecific variation in leaf trait responds little to soil metal toxicity. 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引用次数: 0
摘要
蛇纹石生态系统具有多重环境压力:镍(Ni)等痕量金属含量高、常量营养元素供应少和保水能力低。这些恶劣的环境条件对植被产生了强烈的选择性影响,但它们对群落组合过程和功能性状组成的影响仍然未知。我们在希腊莱斯沃斯岛四个蛇纹石地点的 26 个地块中,测量了 20 种最丰富植物的六种与资源获取和抗逆性相关的叶片功能性状。我们量化了种间和种内性状差异所解释的变异比例,并测试了单个物种的性状值是否因土壤镍含量而发生变化。我们采用混合模型方法和功能多样性分析,研究了每个性状在自然土壤镍梯度上的适应价值和群落水平变化。我们检验了丰富的蛇纹石特有物种和镍高积累物种 Odontarrhena lesbiaca 在驱动这些模式中的作用。由土壤镍含量解释的种内变异小于 4%,大部分变异由性状值的种间差异解释。大多数物种的性状值对土壤镍的反应没有明显变化。在群落水平上,高 Ni 土壤选择了低比叶面积、小叶片和厚叶片。功能多样性分析表明,在富含镍的土壤上,植物向抗逆综合征(叶片厚而小,SLA 值低)转变,功能多样性增加。然而,这些模式是由 O. lesbiaca 数量的增加所驱动的。特有的镍高积累植物具有小而厚的叶片和低 SLA 值的胁迫耐受策略,而广泛分布的物种群落则显示出与优势和快速生长相关的性状值的增加。综述。叶片性状的种内变异对土壤金属毒性的反应很小。与分布广泛的物种相比,特有物种具有独特的性状值,因此应优先保护这些物种。
Interspecific trait differences drive plant community responses on serpentine soils
Serpentine ecosystems are characterised by multiple environmental stressors: high levels of trace metals such as nickel (Ni), low availability of macronutrients and low water retention. These harsh environmental conditions exert a strong selective force on the vegetation, but their effect on community assembly processes and the functional trait composition remains unknown.In 26 plots on four serpentine sites on Lesbos Island (Greece), we measured six leaf functional traits related to resource acquisition and stress resistance on the 20 most abundant plant species. We quantified the proportion of variance explained by inter‐ and intraspecific trait differences and tested if individual species showed changes in trait values explained by soil Ni content. We investigated the adaptive value and the community level changes for each trait along the natural soil Ni gradient using a mixed model approach and functional diversity analyses. We tested the role of the abundant serpentine endemic and Ni‐hyperaccumulating species Odontarrhena lesbiaca in driving these patterns.Intraspecific variation explained by soil Ni content is smaller than 4%, and most of the variance is explained by interspecific differences in trait values. Most species do not show significant changes in trait values in response to soil Ni. At the community level, low specific leaf areas, small and thick leaves are selected on high Ni soils. Functional diversity analyses suggest a shift towards a stress tolerance syndrome (thick and small leaves with low SLA values) and an increase in functional diversity on Ni‐rich soils. However, these patterns are driven by the increasing abundance of O. lesbiaca.The endemic Ni hyperaccumulator has a stress tolerance strategy with small thick leaves and low SLA, while the community of broadly distributed species show an increase in trait values related to dominance and fast growth.Synthesis. Intraspecific variation in leaf trait responds little to soil metal toxicity. Endemic species harbour unique trait values compared to species with broad distribution which should justify their conservation as a priority.
期刊介绍:
Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants.
We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.