Differences in plasticity between invasive and native plants from a low resource environment
Differences in plasticity between invasive and native plants from a low resource environment
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DOI：
10.1111/j.1365-2745.2008.01435.x
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发表时间：
2008-11-01
影响因子：
5.5
通讯作者：
Funk, Jennifer L.
中科院分区：
文献类型：
--
作者：
Funk, Jennifer L.
1.表型可塑性常被认为是植物入侵的一个重要机制。然而，很少有研究已经评估了一组不同的特征之间的可塑性入侵和本地物种，特别是在低资源栖息地，没有检查这些特征的功能意义。我探讨了性状可塑性的变化，在光和养分的可用性在五个生物遗传相关的对本地和入侵物种发生在营养不良的栖息地。除了性状可塑性的大小，我评估了16个叶和植物水平的性状和植物性能之间的相关性，以植物总生物量来衡量。由于形态和生理性状的可塑性被认为在低资源环境中是有限的（在那里，本地物种通常表现出与资源保护相关的性状），我预测本地物种和入侵物种将表现出类似的低水平的性状可塑性。在整个治疗过程中，入侵物种和本地物种对不同的许多测量的特征，但是，入侵物种作为一个群体并没有表现出一致的模式，在性状值的方向。相对于本地物种，入侵物种表现出高可塑性的性状有关的生物量分配和叶水平的氮和光的使用，但只在响应养分供应。入侵物种和本地物种的资源利用效率水平相似，物种可塑性与物种间的资源利用效率之间没有相关性.与碳固定相关的性状与入侵物种的性能密切相关，而只有一个单一的资源保护性状与多个本地物种的性能密切相关。几个高度可塑性的性状与表现没有很强的相关性，这强调了在短时间内评估资源保护性状的功能意义的困难，并对性状可塑性的简单定量评估的相关性提出了质疑。合成.我的数据支持入侵物种表现出高性状可塑性的观点。在这里观察到的物种发生在低资源系统中的可塑性程度与高资源系统中观察到的值相对应，这与性状可塑性在低资源系统中受到约束的一般范式相矛盾。几个性状与植物表现呈正相关，表明性状可塑性会影响植物适合度。
1. Phenotypic plasticity is often cited as an important mechanism of plant invasion. However, few studies have evaluated the plasticity of a diverse set of traits among invasive and native species, particularly in low resource habitats, and none have examined the functional significance of these traits.2. I explored trait plasticity in response to variation in light and nutrient availability in five phylogenetically related pairs of native and invasive species occurring in a nutrient-poor habitat. In addition to the magnitude of trait plasticity, I assessed the correlation between 16 leaf- and plant-level traits and plant performance, as measured by total plant biomass. Because plasticity for morphological and physiological traits is thought to be limited in low resource environments (where native species usually display traits associated with resource conservation), I predicted that native and invasive species would display similar, low levels of trait plasticity.3. Across treatments, invasive and native species within pairs differed with respect to many of the traits measured; however, invasive species as a group did not show consistent patterns in the direction of trait values. Relative to native species, invasive species displayed high plasticity in traits pertaining to biomass partitioning and leaf-level nitrogen and light use, but only in response to nutrient availability. Invasive and native species showed similar levels of resource-use efficiency and there was no relationship between species plasticity and resource-use efficiency across species.4. Traits associated with carbon fixation were strongly correlated with performance in invasive species while only a single resource conservation trait was strongly correlated with performance in multiple native species. Several highly plastic traits were not strongly correlated with performance which underscores the difficulty in assessing the functional significance of resource conservation traits over short timescales and calls into question the relevance of simple, quantitative assessments of trait plasticity.5. Synthesis. My data support the idea that invasive species display high trait plasticity. The degree of plasticity observed here for species occurring in low resource systems corresponds with values observed in high resource systems, which contradicts the general paradigm that trait plasticity is constrained in low resource systems. Several traits were positively correlated with plant performance suggesting that trait plasticity will influence plant fitness.