Evolution of increased intraspecific competitive ability following introduction: The importance of relatedness among genotypes
Evolution of increased intraspecific competitive ability following introduction: The importance of relatedness among genotypes
复制标题
引入后种内竞争能力增强的演变：基因型之间相关性的重要性
DOI：
10.1111/1365-2745.13016
复制
发表时间：
2019
影响因子：
5.5
通讯作者：
Li Bo
中科院分区：
文献类型：
--
作者：
Zhang Zhijie;Zhou Fang;Pan Xiaoyun;van Kleunen Mark;Liu Mu;Li Bo
对入侵成功的一个长期存在的解释是，入侵植物在引入后可能会进化得更具竞争力。然而，这种竞争能力增强（EICA）假说的演变很少被检验种内竞争。鉴于植物可以对相关和不相关的同种表现出不同的反应，种内竞争能力的进化可能是特定于不同亲缘关系的基因型。（南美洲）和五个引进（北美）克隆草本入侵植物空心莲子草的基因型，有来自亲戚的地面竞争（相同的基因型）或来自两种类型的陌生人之一（来自相同范围的另一个基因型或来自另一个范围的另一个基因型）。当单独生长时，引入和本地基因型产生相似的总生物量和贮藏根生物量。然而，在响应种内竞争，引进的基因型表现出增加的总生物量和茎长，并减少特定的茎长，而本地基因型表现出相反的模式。当与亲属而不是陌生人一起生长时，引入的基因型表现出分支数量的增加，而本地基因型表现出相反的情况。我们的研究为入侵植物种内竞争能力的进化提供了证据。我们还发现，第一次，亲属之间的相互作用很可能从竞争转向促进后介绍。
A long‐standing explanation for invasion success is that invasive plants could evolve to be more competitive following introduction. This evolution of increased competitive ability (EICA) hypothesis, however, has seldom been tested with regard to intraspecific competition. Given that plants can display different responses to related and unrelated conspecifics, the evolution of intraspecific competitive ability might be specific to genotypes of different relatedness.Here, we grew five native (South American) and five introduced (North American) genotypes of the clonal herbaceous invasive plantAlternanthera philoxeroidesalone, with above‐ground competition from kin (the same genotype) or from one of two types of strangers (another genotype from the same range or another genotype from the other range).When grown alone, introduced and native genotypes produced similar total biomass and storage‐root biomass. However, in response to intraspecific competition, introduced genotypes showed increases in total biomass and stem length, and a decrease in specific stem length, whereas native genotypes showed the opposite pattern. When grown with kin instead of strangers, introduced genotypes showed an increase in branch number, whereas native genotypes showed the opposite.Synthesis. Our study provided evidence for evolution of increased intraspecific competitive ability in an invasive plant. We also found, for the first time, that the interactions among kin were likely to shift from competition towards facilitation following introduction.