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Bacterial epibiotic communities of ubiquitous and abundant marine diatoms are distinct in short- and long-term associations

TitleBacterial epibiotic communities of ubiquitous and abundant marine diatoms are distinct in short- and long-term associations
Publication TypeJournal Article
Year of Publication2018
AuthorsCrenn K, Duffieux D, Jeanthon C
JournalFrontiers in Microbiology
Volume9
Pagination1–12
ISSN1664-302X
Keywords2018, Chaetoceros, diatoms, diversity, heterotrophic bacteria, interactions, microbiome, rcc, RCC2560, RCC2565, Thalassiosira, Western English Channel
Abstract

Interactions between phytoplankton and bacteria play a central role in mediatingbiogeochemical cycling and food web structure in the ocean. The cosmopolitan diatomsThalassiosiraandChaetocerosoften dominate phytoplankton communities in marinesystems. Past studies of diatom-bacterial associations have employed community-level methods and culture-based or natural diatom populations. Although bacterialassemblages attached to individual diatoms represents tight associations little is knownon their makeup or interactions. Here, we examined the epibiotic bacteria of 436Thalassiosiraand 329Chaetocerossingle cells isolated from natural samples andcollection cultures, regarded here as short- and long-term associations, respectively.Epibiotic microbiota of single diatom hosts was analyzed by cultivation and by cloning-sequencing of 16S rRNA genes obtained from whole-genome amplification products.The prevalence of epibiotic bacteria was higher in cultures and dependent of the hostspecies. Culture approaches demonstrated that both diatoms carry distinct bacterialcommunities in short- and long-term associations. Bacterial epibonts, commonlyassociated with phytoplankton, were repeatedly isolated from cells of diatom collectioncultures but were not recovered from environmental cells. Our results suggest thatin controlled laboratory culture conditions bacterial–diatom and bacterial–bacterialinteractions select for a simplified, but specific, epibiotic microbiota shaped and adaptedfor long-term associations.

URLhttps://www.frontiersin.org/article/10.3389/fmicb.2018.02879/full
DOI10.3389/fmicb.2018.02879