Effects of the density of the flea beetle <i>Agasicles hygrophila</i> on the clonal integration of alligator weed <i>Alternanthera philoxeroides</i>

LI Yuehua; ZHOU Yuhang; WU Haohai; ZHENG Wei; LI Xiaoqiong

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LI Y H, ZHOU Y H, WU H H, et al. Effects of the density of the flea beetle Agasicles hygrophila on the clonal integration of alligator weed Alternanthera philoxeroides [J]. Fujian Journal of Agricultural Sciences，2024，39（X）：1−9

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LI Y H, ZHOU Y H, WU H H, et al. Effects of the density of the flea beetle Agasicles hygrophila on the clonal integration of alligator weed Alternanthera philoxeroides [J]. Fujian Journal of Agricultural Sciences，2024，39（X）：1−9

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Effects of the density of the flea beetle Agasicles hygrophila on the clonal integration of alligator weed Alternanthera philoxeroides

Guangxi University Key Laboratory of Forest Ecology and Conservation, Nanning, Guangxi　530004, China

Received Date: 2023-12-22
Rev Recd Date: 2024-06-07

Available Online: 2024-10-31

Abstract

Abstract

Objective Many invasive plants have clonal growth habits, and clonal integration is considered as an effective way for clonal invaders to alleviate the feeding pressure of natural enemies. However, the effects of the density of natural enemies on the clonal integration ability of invasive clonal plants are largely unclear. Methods In this study, the invasive alligator weed Alternanthera philoxeroides was used as the study object. A common garden experiment was carried out to compare the effects of clonal integration on the growth traits, root growth and biomass allocation of the apical and basal ramets as well as the entire clonal fragment of alligator weed under different feeding densities of the flea beetle Agasicles hygrophila. Results The number of leaves, aboveground biomass, belowground biomass, total biomass and coarse roots of apical ramets as well as belowground biomass of the entire clonal fragment of alligator weed were significantly lower under herbivory by flea beetles compared to without herbivory. The number of leaves, coarse roots, total roots, aboveground biomass, belowground biomass and total biomass of the apical ramets, the diameter of the basal ramets as well as the ground diameter, aboveground biomass, belowground biomass and total biomass of the entire clonal fragment of alligator weed were significantly higher with clonal integration compared to without clonal integration. Under herbivory by one flea beetle, the number of coarse roots of the apical ramets, the ground diameter of the basal ramets and the ground diameter, the number of coarse roots and aboveground biomass of the entire clonal fragment of alligator weed were significantly higher with clonal integration compared to without clonal integration. However, when under herbivory by two flea beetles, although there were no significant differences in the ground diameter, number of coarse roots and aboveground biomass of the apical and basal ramets, the number of leaves, stem length and ground diameter of the entire clonal fragment were significantly higher, with clonal integration compared to without clonal integration. Conclusion The flea beetle density significantly affected the clonal integration ability of alligator weed: this plant can benefit significantly from clone integration without herbivory or under relatively lower flea beetle density (one beetle per plants); however, relatively higher density of flea beetles (two beetles per plant) can conversely reduce the clonal integration ability of alligator weed, thus achieving effective biological control of the flea beetle on alligator weed.
- Invasive plants,
- Clonal integration,
- Alligator weed,
- Agasicles hygrophila,
- Herbivore density

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References(34)

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