Seed dispersal increases local species richness and reduces spatial turnover of tropical tree seedlings

Elizabeth M. Wandrag, Amy E. Dunham, Richard P. Duncan, Haldre S. Rogers

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Dispersal is thought to be a key process underlying the high spatial diversity of tropical forests. Just how important dispersal is in structuring plant communities is nevertheless an open question because it is very difficult to isolate dispersal from other processes, and thereby measure its effect. Using a unique situation, the loss of vertebrate seed dispersers on the island of Guam and their presence on the neighboring islands of Saipan and Rota, we quantify the contribution of vertebrate seed dispersal to spatial patterns of diversity of tree seedlings in treefall gaps. The presence of vertebrate seed dispersers approximately doubled seedling species richness within canopy gaps and halved species turnover among gaps. Our study demonstrates that dispersal plays a key role in maintaining local and regional patterns of diversity, and highlights the potential for ongoing declines in vertebrate seed dispersers to profoundly alter tropical forest composition.

    Original languageEnglish
    Pages (from-to)10689-10694
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume114
    Issue number40
    DOIs
    Publication statusPublished - 3 Oct 2017

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    seed dispersal
    turnover
    vertebrate
    species richness
    seedling
    seed
    tropical forest
    treefall
    canopy gap
    regional pattern
    plant community

    Cite this

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    title = "Seed dispersal increases local species richness and reduces spatial turnover of tropical tree seedlings",
    abstract = "Dispersal is thought to be a key process underlying the high spatial diversity of tropical forests. Just how important dispersal is in structuring plant communities is nevertheless an open question because it is very difficult to isolate dispersal from other processes, and thereby measure its effect. Using a unique situation, the loss of vertebrate seed dispersers on the island of Guam and their presence on the neighboring islands of Saipan and Rota, we quantify the contribution of vertebrate seed dispersal to spatial patterns of diversity of tree seedlings in treefall gaps. The presence of vertebrate seed dispersers approximately doubled seedling species richness within canopy gaps and halved species turnover among gaps. Our study demonstrates that dispersal plays a key role in maintaining local and regional patterns of diversity, and highlights the potential for ongoing declines in vertebrate seed dispersers to profoundly alter tropical forest composition.",
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    Seed dispersal increases local species richness and reduces spatial turnover of tropical tree seedlings. / Wandrag, Elizabeth M.; Dunham, Amy E.; Duncan, Richard P.; Rogers, Haldre S.

    In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, No. 40, 03.10.2017, p. 10689-10694.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Seed dispersal increases local species richness and reduces spatial turnover of tropical tree seedlings

    AU - Wandrag, Elizabeth M.

    AU - Dunham, Amy E.

    AU - Duncan, Richard P.

    AU - Rogers, Haldre S.

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    KW - Biotic homogenization

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    KW - Mutualisms

    KW - Tropical conservation

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