Functional rarity and evenness are key facets of biodiversity to boost multifunctionality

TitleFunctional rarity and evenness are key facets of biodiversity to boost multifunctionality
Publication TypeJournal Article
Year of Publication2021
AuthorsLe Bagousse-Pinguet Y., Gross N., Saiz H., Maestre F.T, Ruiz S., Dacal M., Asensio S., Ochoa V., Gozalo B., Cornelissen J.HC, Deschamps L., Garcia C., Maire V., Milla R., Salinas N., Wang J.T, Singh B.K, Garcia-Palacios P.
JournalProceedings of the National Academy of Sciences of the United States of America
Date PublishedFeb
Type of ArticleArticle
ISBN Number0027-8424
Accession NumberWOS:000621748600046
Keywordscomplex species assemblages, consequences, diversity, driver, ecosystems, fungal community, litter decomposition, nutrient cycling, plant pathogens, Science & Technology - Other Topics, soil, trait distributions, TRAITS

The functional traits of organisms within multispecies assemblages regulate biodiversity effects on ecosystem functioning. Yet how traits should assemble to boost multiple ecosystem functions simultaneously (multifunctionality) remains poorly explored. In a multibiome litter experiment covering most of the global variation in leaf trait spectra, we showed that three dimensions of functional diversity (dispersion, rarity, and evenness) explained up to 66% of variations in multifunctionality, although the dominant species and their traits remained an important predictor. While high dispersion impeded multifunctionality, increasing the evenness among functionally dissimilar species was a key dimension to promote higher multifunctionality and to reduce the abundance of plant pathogens. Because too-dissimilar species could have negative effects on ecosystems, our results highlight the need for not only diverse but also functionally even assemblages to promote multifunctionality. The effect of functionally rare species strongly shifted from positive to negative depending on their trait differences with the dominant species. Simultaneously managing the dispersion, evenness, and rarity in multispecies assemblages could be used to design assemblages aimed at maximizing multifunctionality independently of the biome, the identity of dominant species, or the range of trait values considered. Functional evenness and rarity offer promise to improve the management of terrestrial ecosystems and to limit plant disease risks.

Short TitleProc. Natl. Acad. Sci. U. S. A.Proc. Natl. Acad. Sci. U. S. A.
Alternate JournalProc. Natl. Acad. Sci. U. S. A.