J Plant Ecol ›› 2023, Vol. 16 ›› Issue (5): rtad007.DOI: 10.1093/jpe/rtad007

• Research Articles •    

Functional and phylogenetic similarities of co-occurring invaders affect the growth of an invasive forb

Jie Ren1,2, Pengdong Chen1,2, Changchao Shen1,2, Zhibin Tao1,3, Wei Huang1,3,*   

  1. 1CAS Key Laboratory of Aquatic Botany, Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan430074, China;
    2University of Chinese Academy of Sciences, Beijing100049, China;
    3Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan430074, China
  • Received:2022-11-08 Revised:2022-12-11 Accepted:2023-02-10 Online:2023-03-01 Published:2023-10-01
  • Contact: E-mail: huangwei0519@wbgcas.cn


Abstract: Expansion of global trade and acceleration of climate change dramatically promote plant invasions. As a result, a large number of habitats harbor multiple invasive plant species. However, patterns of invasive interactions and the drivers mediating their interactions remain unclear. In this greenhouse, potted plant study, we tested the impacts of 18 invasive plant species on the growth of target invader Erigeron canadensis which is dominant in central China. Neighboring invasive species belong to three functional groups (grass, forb and legume) and have different levels of relatedness to E. canadensis. Growth of E. canadensis’ strongly depended on the identity of neighboring invaders. Some neighboring invasive species suppressed growth of E. canadensis, others had no effect, while some promoted growth of E. canadensis. Through analyses of functional and phylogenetic similarities between the target species and neighboring invaders, we showed that two factors probably play roles in determining the relative responses of E. canadensis. Generally, E. canadensis responded negatively to invasive grasses and forbs, while it responded positively to invasive legumes. Furthermore, the negative responses to neighboring invasive grasses and forbs increased with increasing phylogenetic distance between the neighbors and E. canadensis. In contrast, the positive responses to invasive legumes did not depend on phylogenetic distance from E. canadensis. Our results suggest that successful invasion of E. canadensis probably depends on the identity of co-occurring invasive plant species. Interactions between E. canadensis and other invasive species should help managers select management priorities.

Key words: co-invasion, competition, exotic plants invasion, facilitation, interspecific interactions, invasive-invasive interactions

全球贸易扩张和气候变化促进外来植物的入侵,致使很多生境存在多种入侵植物。然而,入侵物种间如何相互作用,以及调节其相互作用的内在机制仍不清楚。本研究通过温室盆栽实验,探究18种入侵植物的邻近效应对中国中部主要入侵植物小蓬草(Erigeron canadensis)生长的影响。所选取的邻近入侵植物分为3个功能群:禾草类、非禾草类草本和豆科植物。同时,这些邻近入侵植物与小蓬草的系统发育距离存在差异。研究结果表明,小蓬草的生长取决于邻近入侵植物的种类。12种入侵植物抑制了小蓬草的生长,4种入侵植物促进其生长,而其它入侵植物对小蓬草的生长没有影响。此外,小蓬草和邻近入侵植物的功能和系统发育相似性决定小蓬草的生长。豆科入侵植物促进小蓬草的生长,而禾草类植物和非禾草类草本植物抑制小蓬草的生长。虽然促进作用不受系统发育距离的影响,但是抑制作用随着小蓬草与邻近入侵植物系统发育距离的增加不断增强。这些结果表明,小蓬草的成功入侵可能依赖于邻近入侵植物的种类。小蓬草与邻近入侵植物互作关系和驱动机制的研究,有助于制定多种入侵植物防控治理的优先次序。

关键词: 共同入侵, 竞争, 外来植物入侵, 促进, 种间相互作用, 入侵物种间相互作用