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    Author(s): Songlin Fei; Randall S. MorinChristopher M. OswaltAndrew M. Liebhold
    Date: 2019
    Source: Proceedings of the National Academy of Sciences
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (1.0 MB)

    Description

    Worldwide, forests are increasingly affected by nonnative insects and diseases, some of which cause substantial tree mortality. Forests in the United States have been invaded by a particularly large number (>450) of tree-feeding pest species. While information exists about the ecological impacts of certain pests, region-wide assessments of the composite ecosystem impacts of all species are limited. Here we analyze 92,978 forest plots distributed across the conterminous United States to estimate biomass loss associated with elevated mortality rates caused by the 15 most damaging nonnative forest pests. We find that these species combined caused an additional (i.e., above background levels) tree mortality rate of 5.53 TgC per year. Compensation, in the form of increased growth and recruitment of nonhost species, was not detectable when measured across entire invaded ranges but does occur several decades following pest invasions. In addition, 41.1% of the total live forest biomass in the conterminous United States is at risk of future loss from these 15 pests. These results indicate that forest pest invasions, driven primarily by globalization, represent a huge risk to US forests and have significant impacts on carbon dynamics.

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    Citation

    Fei, Songlin; Morin, Randall S.; Oswalt, Christopher M.; Liebhold, Andrew M. 2019. Biomass losses resulting from insect and disease invasions in US forests. Proceedings of the National Academy of Sciences: 201820601. 6 p. https://doi.org/10.1073/pnas.1820601116.

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    Keywords

    pest invasion, carbon, forest ecosystem, biomass

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https://www.fs.usda.gov/treesearch/pubs/58371