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Predicting non-native insect impact: focusing on the trees to see the forest

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Abstract

Non-native organisms have invaded novel ecosystems for centuries, yet we have only a limited understanding of why their impacts vary widely from minor to severe. Predicting the impact of non-established or newly detected species could help focus biosecurity measures on species with the highest potential to cause widespread damage. However, predictive models require an understanding of potential drivers of impact and the appropriate level at which these drivers should be evaluated. Here, we used non-native, specialist herbivorous insects of forest ecosystems to test which factors drive impact and if there were differences based on whether they used woody angiosperms or conifers as hosts. We identified convergent and divergent patterns between the two host types indicating fundamental similarities and differences in their interactions with non-native insects. Evolutionary divergence time between native and novel hosts was a significant driver of insect impact for both host types but was modulated by different factors in the two systems. Beetles in the subfamily Scolytinae posed the highest risk to woody angiosperms, and different host traits influenced impact of specialists on conifers and woody angiosperms. Tree wood density was a significant predictor of host impact for woody angiosperms with intermediate densities (0.5–0.6 mg/mm3) associated with highest risk, whereas risk of impact was highest for conifers that coupled shade tolerance with drought intolerance. These results underscore the importance of identifying the relevant levels of biological organization and ecological interactions needed to develop accurate risk models for species that may arrive in novel ecosystems.

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Data availability

Data supporting the results are archived in the U.S. Geological Survey ScienceBase‐Catalog (Mech et al. 2020a, b).

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Acknowledgements

We thank Dr. Jill Baron and the U.S. Geological Survey John Wesley Powell Center for Analysis and Synthesis, Fort Collins, CO, for their support of this project. We also thank David Campbell (University of Washington) and Terry Arundel (USGS) for database assistance, Karla Boyd (University of Maine), Lekeah Durden (USGS-NFS Graduate Research Intern), and Atticus Wolf (University of Arizona) for assistance with data entry, and Dr. Gary Lovett for feedback on an early draft of the manuscript.

Funding

This project was conducted as a part of the “Predicting the next high-impact insect invasion: Elucidating traits and factors determining the risk of introduced herbivorous insects on North American native plants” working group supported by the U.S. Geological Survey John Wesley Powell Center for Analysis and Synthesis (to KAT, TDM, DAH, and PCT, and Cooperative Agreement No. G16AC00065 to PCT) and the U.S. Department of Agriculture Forest Service Eastern Forest Environmental Threat Assessment (Grant No. 15‐JV‐11242303‐103 to PCT). Additional support was provided by the University of Washington, Nebraska Cooperative Fish and Wildlife Research Unit, U.S. Department of Agriculture Forest Service National Urban and Community Forestry Advisory Council Grant (Grant No. 19-DG-11132544-022 to RAH, DAH, and MPA), National Science Foundation Long Term Ecological Research program (MPA), U.S. Department of Agriculture Forest Service International Programs (MPA and AML), U.S. Department of Agriculture National Institute of Food and Agriculture (Hatch project 1012868 to RAH and Hatch project ME022124 to AMM through the Maine Agricultural & Forest Experiment Station), and U.S. Geological Survey Ecosystems Mission Area to KAT and AMH. PCT acknowledges support from the David R.M. Scott Endowed Professorship in Forest Resources. Salary support and matching funds were provided by our respective institutions. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the United States Government.

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Contributions

TDM, KAT, DAH, and PCT conceived the project. All authors contributed to the study design; AMM, AMH, NPH, ANS, TDM, KAT, RAH, and AML collected the study data; ANS, AMM, DRU, and NPH analyzed the data; all authors contributed to writing and editing the manuscript; all authors gave final approval for publication and agree to be held accountable for the work performed therein.

Corresponding author

Correspondence to Angela M. Mech.

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Schulz, A.N., Mech, A.M., Ayres, M.P. et al. Predicting non-native insect impact: focusing on the trees to see the forest. Biol Invasions 23, 3921–3936 (2021). https://doi.org/10.1007/s10530-021-02621-5

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  • DOI: https://doi.org/10.1007/s10530-021-02621-5

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