Interactions in self-assembled microbial communities saturate with diversity

TitleInteractions in self-assembled microbial communities saturate with diversity
Publication TypeJournal Article
Year of Publication2019
AuthorsYu X.Q, Polz M.F, Alm E.J
JournalIsme JournalIsme JournalIsme Journal
Volume13
Pagination1602-1617
Date PublishedJun
Type of ArticleArticle
ISBN Number1751-7362
Accession NumberWOS:000468529400017
KeywordsBacteria, biodiversity, database, determines, Environmental Sciences & Ecology, evolution, growth, Microbiology, populations, species interactions, tools
Abstract

How the diversity of organisms competing for or sharing resources influences community function is an important question in ecology but has rarely been explored in natural microbial communities. These generally contain large numbers of species making it difficult to disentangle how the effects of different interactions scale with diversity. Here, we show that changing diversity affects measures of community function in relatively simple communities but that increasing richness beyond a threshold has little detectable effect. We generated self-assembled communities with a wide range of diversity by growth of cells from serially diluted seawater on brown algal leachate. We subsequently isolated the most abundant taxa from these communities via dilution-to-extinction in order to compare productivity functions of the entire community to those of individual taxa. To parse the effect of different types of organismal interactions, we defined relative total function (RTF) as an index for positive or negative effects of diversity on community function. Our analysis identified three overall regimes with increasing diversity. At low richness (

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Alternate JournalIsme J.