Evidence for impacts of nonindigenous macroalgae: a meta-analysis of experimental field studies

M.S. Thomsen, Thomas Wernberg, F. Tuya, B.R. Silliman

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    91 Citations (Scopus)

    Abstract

    Invasions by nonindigenous macroalgal species (NIMS) potentially cause severe impacts on native species. We conducted a meta-analysis of 18 field-based manipulative experiments to quantify the direction and magnitude of impacts (Hedges effect size d, hereafter ES). We found significant small-to-medium negative effects on “macrophyte abundance” (cover, biomass of native taxa; EScumulative = −0.30) and medium-to-large negative effects on “macrophyte assemblages” (richness, diversity, total abundance; EScumulative = −0.70). In contrast, EScumulative were not significant for “macrophyte processes” (growth, mortality; EScumulative = −0.39), “animal abundance” (densities; EScumulative = −0.13), or “animal assemblages” (richness, diversity; EScumulative = 0.75). The nonsignificant effect sizes were characterized by low sample sizes and should be interpreted with caution. Three study-specific effect sizes were particularly large (
    Original languageEnglish
    Pages (from-to)812-819
    JournalJournal of Phycology - an International journal of algal research
    Volume45
    Issue number4
    DOIs
    Publication statusPublished - 2009

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