[ES_JOBS_NET] Postdoc in Arctic geomicrobiology and biogeochemistry (experimental) - Marseille, France

[James Bradley]

*Postdoc in Arctic geomicrobiology and biogeochemistry (experimental) -
Marseille, France*



*Apply: *
https://emploi.cnrs.fr/Offres/CDD/UMR7294-SYLJOV-023/Default.aspx?lang=EN



*Application Deadline :* 30 September 2025 23:59:00 Paris time



*Reference :* UMR7294-SYLJOV-023
*Workplace :* Marseille, France
*Contract Period :* 24 months
*Expected date of employment :* 1 February 2026



*Missions*

We are seeking a postdoc (M/W) in geomicrobiology (PhD-level position) in
Marseille, France, to work on the European Research Council funded Starting
Grant project 'SIESTA: The Role of Microbial Dormancy as an Ecological and
Biogeochemical Regulator on Earth'. The position is under the supervision
of Dr. James Bradley (https://www.jbradleylab.com/). The recruited person
will work with the principal investigator and will participate in
laboratory experiments, data analysis, field work, and work as part of a
project team that includes doctoral students and technical staff. The main
objective of this postdoc position is (1) to measure the activity and
dormancy of diverse microbial communities in cryospheric environments, and
(2) to link the activity and dormancy of these microbial communities to
biogeochemical cycles. This data will feed into wider project goals to
understand the role of dormancy as a regulator of biogeochemical cycles,
and to link dormancy to the emergence, survival and evolution of microbial
populations.

Applicants should hold a Ph.D. in a relevant natural science discipline
(e.g. environmental microbiology, geomicrobiology and biogeochemistry,
microbial ecology and evolution). The CDD is offered for 2 years and is
renewable on an annual basis, contingent on satisfactory performance
evaluations. We expect a flexible start date around February 2026,
adjustable based on the candidate's availability and the requirements of
the project.

Applicants should submit IN ENGLISH 1) a current curriculum vitae; 2) a
cover letter (maximum 2 pages) stating their motivation for applying to
this position, research interests, relevant skills, training and
experience; 3) contact information for at least two and up to three
professional references. Please combine these documents into a single PDF.
Important: Please also email Dr. James Bradley (
james.bradley at mio.osupytheas.fr) to confirm your intention to apply. Apply
as soon as possible. The application window will remain open for three
weeks after the date that it is advertised online, and on a rolling basis
thereafter (depending on whether or not a candidate has been selected).
Contact Dr James Bradley (james.bradley at mio.osupytheas.fr) with any
questions.



*Activities*

The postdoc (M/W) will contribute to different research aspects on the
project:

·      Study/analysis of cryosphere (cryoconite, ice, sediment, soil)
environments and microbiomes (experimental and observational).

·      High-resolution sampling of natural microbial populations (including
fieldwork in remote Arctic regions).

·      Molecular and experimental microbiological and biogeochemical
laboratory work.

·      Generation and analyses (bioinformatic and statistical) of
environment and microbiome data, including amplicon sequencing libraries,
metagenomes, and metatranscriptomes.

·      Publish (as lead and co-author) in leading academic journals,
participation in scientific conferences, outreach activities.

·      Collate and catalogue data for deposition and archiving in data
repositories.



*Skills*

·      Expert knowledge of microbial ecology, biogeochemistry, microbial
adaptation to extreme environments, microbial ecophysiology.

·      Demonstrated skills and experience in a range of microbiology
competencies (molecular biology, environmental microbiology,
'omics/sequencing, physiology/incubation/activity measurement and
experiments).

·      Technical skills and experience in microbial incubation experiments,
activity/ecophysiology measurement at the community and/or single cell
level, metagenomics and/or metatranscriptomics.

·      Technical skills and experience in cell-specific activity
measurements including fluorescent markers for cell activity, flow
cytometry, cell sorting (e.g. BONCAT-FACS).

·      Quantitative skills in analysis of large datasets, for example: to
integrate biological/genomic data with biogeochemical measurements,
biogeographic, phylogenomic, comparative, time series (community or
population) modelling/analyses.

·      Demonstrated skills in bioinformatic and statistical analyses of
microbiome, geochemical and ecological data including sequencing data.

·      Analysis skills: write and execute code in R, Python, GitHub etc.,
high-performance computing.

·      Strong oral and written communication skills in English.

·      Ability to work independently and flexibly.

·      Ability to work harmoniously as part of a team.

·      A track-record of research productivity.

·      Awareness of open science standards for microbiome research
(reproducible analyses, preservation of metadata and repository of public
data).





*Work Context*

The successful candidate (M/W) will work at the Mediterranean Institute of
Oceanology (MIO), in Marseille Luminy. The MIO is an Oceanography research
laboratory of the Universities of Aix-Marseille, Toulon, CNRS and IRD. It
is integrated into OSU Pythéas. Its objectives are to better understand the
ocean system and its evolution in response to global change. It constitutes
a center of expertise in biology, ecology, biodiversity, microbiology,
fisheries, physics, chemistry, biogeochemistry and marine sedimentology.
Its frameworks are the world ocean, its interfaces with the continent, the
atmosphere and the sediment. The MIO has more than 250 people, including
around a hundred researchers (CNRS, IRD) and teacher-researchers from
universities, around sixty engineers and technicians, more than 50 doctoral
students and an administrative team serving research. The candidate (M/W)
will join the MEB team, working in the ERC project SIESTA led by James
Bradley. The successful candidate (M/W) will enjoy a vibrant research
group, access to excellent research facilities and platforms at the
Mediterranean Institute of Oceanography and Aix-Marseille University, and
be embedded in a team committed to high scientific integrity, open and
reproducible science, and promoting inclusivity. Marseille is an
affordable, vibrant and historic city on the Mediterranean coast, with
culinary excellence, diverse cultural experiences, and a large
international community. The Mediterranean Institute of Oceanography, on
the Luminy campus of Aix-Marseille Université, is surrounded by nature
being nestled among the spectacular Calanques National Park.



*Constraints and risks*

Travel and fieldwork in remote (glaciated, Arctic) environments for field
collection of samples, and attending scientific meetings for dissemination
of results.
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