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    Author(s): Benedicte Bachelot; Aura M. Alonso-Rodríguez; Laura Aldrich-Wolfe; Molly A. Cavaleri; Sasha C. Reed; Tana E. Wood
    Date: 2020
    Source: Global Change Biology
    Publication Series: Scientific Journal (JRNL)
    Station: International Institute of Tropical Forestry
    PDF: Download Publication  (1.0 MB)

    Description

    Abstract Climate change is predicted to result in warmer and drier Neotropical forests relative to current conditions. Negative density-dependent feedbacks, mediated by natural enemies, are key to maintaining the high diversity of tree species found in the tropics, yet we have little understanding of how projected changes in climate are likely to affect these critical controls. Over three years, we evaluated the effects of a natural drought and in situ experimental warming on density-dependent feedbacks on seedling demography in a wet tropical forest in Puerto Rico. In the +4oC warming treatment, we found that seedling survival increased with increasing density of the same species (conspecific). These positive density-dependent feedbacks were not associated with a decrease in aboveground natural enemy pressure. If positive density-dependent feedbacks are not transient, the diversity of tropical wet forests, which may rely on negative density dependence to drive diversity, could decline in a future warmer, drier world.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Bachelot, Benedicte; Alonso-Rodríguez, Aura M.; Aldrich-Wolfe, Laura; Cavaleri, Molly A.; Reed, Sasha C.; Wood, Tana E. 2020. Altered climate leads to positive density-dependent feedbacks in a tropical wet forest. Global Change Biology. https://doi.org/10.1111/gcb.15087

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    Keywords

    Tropical wet forest, Negative density dependence, Positive density dependence, Climate change, Arbuscular mycorrhizal fungi.

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https://www.fs.usda.gov/treesearch/pubs/59917