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Elevated CO2 affects interspecific competition between the invasive thrips Frankliniella occidentalis and native thrips species

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Abstract

We explored the effects of elevated CO2 on the population performance and interspecific interactions of three thrips pests. The dominance of the three thrips in the field was Frankliniella occidentalisFrankliniella intonsa > Thrips hawaiiensis. The performance of these thrips, alone and in combination, was evaluated in the laboratory under elevated CO2 (800 μl L−1) and ambient CO2. Compared with ambient CO2, elevated CO2 significantly accelerated the developmental rates and decreased the survival rates of all thrips species. Significant differences in fecundity, intrinsic rate of increase (rm), and net reproductive rate (R0) were observed among these thrips, and their values were significantly increased in F. occidentalis but decreased in F. intonsa and T. hawaiiensis under elevated CO2, compared that in the ambient CO2 treatments. In treatments where thrips species coexisted, F. occidentalis and F. intonsa accounted for similar proportions of the population, and both were dominant over T. hawaiiensis within 10 generations under ambient CO2. Under elevated CO2, F. occidentalis was the dominant species and completely displaced F. intonsa and T. hawaiiensis by the ninth or eighth generation. Where the three species coexisted, no displacement occurred within 10 generations, but the pattern of dominance shifted to F. occidentalis > F. intonsa > T. hawaiiensis. Our results show that the population development of F. occidentalis benefits from elevated CO2 and that it can become the dominant species in interspecific interactions with native thrips species. Thus, compared with native thrips species, F. occidentalis has greater adaptability and competitive capacity under elevated CO2, and it may become a more dangerous crop pest under environmental change in the future.

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Funding

This study was financially supported by the Key project of Natural Science Foundation of Guizhou Province (ZK[2022]001), Key Laboratory of Surveillance and Management for Alien Invasive Species in Guizhou Province (QJJ[2023]024), the Regional First Class Discipline Construction of Guizhou Province (XKTJ[2020]14), and Academic New Seedling Cultivation and Free Exploration & Innovation Project from Guizhou Provincial Science and Technology Department (2023).

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Correspondence to Stuart R. Reitz or Yu Cao.

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This research did not involve any human participants and/or animals, only the thrips species.

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Communicated by Swevers Luc.

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Zhang, T., Wang, C., Jiang, F. et al. Elevated CO2 affects interspecific competition between the invasive thrips Frankliniella occidentalis and native thrips species. J Pest Sci (2024). https://doi.org/10.1007/s10340-023-01723-4

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  • DOI: https://doi.org/10.1007/s10340-023-01723-4

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