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Aboveground herbivory can promote exotic plant invasion through intra- and interspecific aboveground–belowground interactions

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2023

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Gao, Lunlun
Wei, Chunqiang
He, Yifan
Tang, Xuefei
Chen, Wei
Xu, Hao
Wu, Yuqing
Lu, Xinmin

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New Phytologist. Wiley. 2023, 237(6), S. 2347-2359. ISSN 0028-646X. eISSN 1469-8137. Verfügbar unter: doi: 10.1111/nph.18520

Zusammenfassung

Aboveground herbivores and soil biota profoundly affect plant invasions. However, how they interactively affect plant invasions through plant–soil feedbacks (PSFs) remains unclear.

To explore how herbivory by the introduced beetle Agasicles hygrophila affects Alternanthera philoxeroides invasions in China, we integrated multiyear field surveys and a 2-yr PSF experiment, in which we examined how herbivory affects PSFs on the performance of native and invasive plants and the introduced beetles.

Despite increased herbivory from A. hygrophila, A. philoxeroides dominance over co-occurring congeneric native Alternanthera sessilis remained constant from 2014 to 2019. While occurring at lower abundances, A. sessilis experienced similar herbivore damage, suggesting apparent competitive effects. Our experiments revealed that herbivory on A. philoxeroides altered soil microbial communities, prolonged its negative PSF on A. sessilis, and decreased A. hygrophila larvae performance on the next-generation invasive plants. Consequently, A. hygrophila larvae performed better on leaves of natives than those of invasives when grown in soils conditioned by invasive plants defoliated by the introduced beetles.

Our findings suggest that aboveground herbivory might promote rather than suppress A. philoxeroides invasion by enhancing its soil-mediated self-reinforcement, providing a novel mechanistic understanding of plant invasions. These findings highlight the need to incorporate an aboveground–belowground perspective during the assessment of potential biocontrol agents.

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570 Biowissenschaften, Biologie

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ISO 690GAO, Lunlun, Chunqiang WEI, Yifan HE, Xuefei TANG, Wei CHEN, Hao XU, Yuqing WU, Rutger A. WILSCHUT, Xinmin LU, 2023. Aboveground herbivory can promote exotic plant invasion through intra- and interspecific aboveground–belowground interactions. In: New Phytologist. Wiley. 2023, 237(6), S. 2347-2359. ISSN 0028-646X. eISSN 1469-8137. Verfügbar unter: doi: 10.1111/nph.18520
BibTex
@article{Gao2023Above-59185,
  year={2023},
  doi={10.1111/nph.18520},
  title={Aboveground herbivory can promote exotic plant invasion through intra- and interspecific aboveground–belowground interactions},
  number={6},
  volume={237},
  issn={0028-646X},
  journal={New Phytologist},
  pages={2347--2359},
  author={Gao, Lunlun and Wei, Chunqiang and He, Yifan and Tang, Xuefei and Chen, Wei and Xu, Hao and Wu, Yuqing and Wilschut, Rutger A. and Lu, Xinmin}
}
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