Trait differences between and within ranges of an invasive legume species
Trait differences between and within ranges of an invasive legume species
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DOI：
10.1007/s10530-022-02817-3
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发表时间：
2022-01
影响因子：
2.9
通讯作者：
Carmen Hoffbeck;Casey P. terHorst
中科院分区：
文献类型：
--
作者：
Carmen Hoffbeck;Casey P. terHorst
新的生态相互作用可以推动非本地物种的自然选择，性状进化可能增加入侵的可能性。通过比较入侵范围内成功个体的特征与本地范围内个体的特征，我们可以深入了解进化在入侵成功中的潜在作用，从而确定哪些特征最有可能使物种克服入侵障碍。在这里，我们使用了多态紫花苜蓿（medicago polymorpha），一种来自地中海的非本地豆科植物，已经入侵了世界上的六大洲，来量化从本地和入侵范围收集的基因型之间的生活史特征差异，并在共同的温室环境中生长。我们发现入侵地和本地地基因型在果实和种子产量和生物量分配上存在显著差异。入侵基因型具有更高的繁殖力，但相对于本地基因型投入更多的能量在地下生长。除了区域间的差异外，每个区域内基因型之间在开花物候、总生物量、生物量分配和繁殖力等方面也存在差异。我们发现一些性状和适应度之间的非线性关系在入侵范围内的植物中更为强烈。这些性状差异表明，在引进过程中或引进后对生物量、资源分配和开花物候进行稳定的选择可能会提高入侵成功率。
Novel ecological interactions can drive natural selection in non-native species and trait evolution may increase the likelihood of invasion. We can gain insight into the potential role of evolution in invasion success by comparing traits of successful individuals in the invasive range with the traits of individuals from the native range in order to determine which traits are most likely to allow species to overcome barriers to invasion. Here we usedMedicago polymorpha, a non-native legume species from the Mediterranean that has invaded six continents around the world, to quantify differences in life history traits among genotypes collected from the native and invasive range and grown in a common greenhouse environment. We found significant differences in fruit and seed production and biomass allocation between invasive and native range genotypes. Invasive genotypes had greater fecundity, but invested more energy into belowground growth relative to native genotypes. Beyond the variation between ranges, we found additional variation among genotypes within each range in flowering phenology, total biomass, biomass allocation, and fecundity. We found non-linear relationships between some traits and fitness that were much stronger for plants from the invasive range. These trait differences between ranges suggest that stabilizing selection on biomass, resource allocation, and flowering phenology imposed during or after introduction of this species may increase invasion success.