Herbivore and native plant diversity synergistically resist alien plant invasion regardless of nutrient conditions

doi:10.1016/j.pld.2023.09.002

Abstract

Abstract: Alien plant invasion success can be inhibited by two key biotic factors: native herbivores and plant diversity. However, few studies have experimentally tested whether these factors interact to synergistically resist invasion success, especially factoring in changing global environments (e.g. nutrient enrichment). Here we tested how the synergy between native herbivores and plant diversity affects alien plant invasion success in various nutrient conditions. For this purpose, we exposed alien plant species in pot-mesocosms to different levels of native plant diversity (4 vs. 8 species), native generalist herbivores, and high and low soil nutrient levels. We found that generalist herbivores preferred alien plants to native plants, inhibiting invasion success in a native community. This inhibition was amplified by highly diverse native communities. Further, the amplified effect between herbivory and native plant diversity was independent of nutrient conditions. Our results suggest that a higher diversity of native communities can strengthen the resistance of native generalist herbivores to alien plant invasions by enhancing herbivory tolerance. The synergistic effect remains in force in nutrient-enriched habitats that are always invaded by alien plant species. Our results shed light on the effective control of plant invasions using multi-trophic means, even in the face of future global changes.

Key words: Biological invasion, Biotic resistance, Diversity conservation, Plant-herbivore interactions, Resource availability, Global change

Liping Shan, Meng Hou. Herbivore and native plant diversity synergistically resist alien plant invasion regardless of nutrient conditions[J]. Plant Diversity, 2024, 46(05): 640-647.

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