Séminaire CEFE : Rubber boots to explore co-evolution into the wild

Jeudi 23 mai 2019 – 14h00
Grande salle de réunion du CEFE | 1e étage, aile C

Frédérique Le roux  
Station biologique de Roscoff

Abstract: Recent analysis of microbial dynamics in the coastal ocean has shown rapid, near weekly, turnover of communities that are characterized by short-lived blooms of different bacteria and eukaryotes. Exploration to what extent such transient communities allow for specific blooms of virulent Vibrio populations may elucidate whether there are periods of in-creased risk from multiple co-occurring populations or whether risk is similar across extend-ed periods due to sequential blooms of populations. To address this question, we carried out a time-series sampling of an oyster farming area over 5 months (before and during oyster mortalities events) and every two days archives were generated of total community DNA (4 size seawater fractions and oysters), total community glycerols preserving live cells, envi-ronmental metadata (e.g., temperature, salinity, cytometry) and virus concentrates. First re-sults obtained from our time serie sampling reveals exciting features regarding the regula-tion of vibrio dynamic by their predators, the phages.

Bio: The work of Dr. Le Roux is focused on investigating the molecular mechanisms involved in the emergence of vibrio pathogenesis of marine invertebrates. These include molecular epidemiology with emphasis on biodiversity, virulence and genome plasticity, environmental genomics and host/pathogens interactions. Her lab has shown strong technical competence in genomic and genetic developments over the last decade, whilst investigation several vib-rio species isolated from osyters, shrimps and corals.

(Seminar in English)

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