Aarhus University, a leading global research institution in Denmark, invites applications for a fully funded PhD Fellowship in the Biology Programme. This position offers an exciting opportunity to explore the frontiers of environmental microbiology, specifically investigating the discovery and characterization of new anaerobic hydrocarbon-oxidizing microbial clades in marine sediment and deep-sea environments.
The fellowship is hosted by the renowned Research Group Archaea within the Department of Biology – Microbiology. This world-class team focuses on the ecophysiology, metabolic pathways, and environmental significance of deep-sea archaea, contributing to our understanding of how volatile alkanes (like ethane, propane, and butane) are naturally cycles in anoxic ecosystems.
Project Scope & Scientific Goals
Hydrocarbons such as propane and ethane represent major constituents of natural gas. In marine sediments, their metabolism by subsurface microbes influences global carbon and energy cycles. However, the exact organisms and metabolic partnerships responsible for these anaerobic processes remain poorly understood.
This PhD project aims to identify, cultivate, and characterize previously unknown clades of:
- Anaerobic hydrocarbon-degrading Archaea
- Sulfate-Reducing Bacteria (SRB)
- Archaea–SRB synergistic consortia
By uncovering these microbial clades, the project will shed light on the natural regulation of subsurface hydrocarbon emissions and the survival mechanisms of life in energy-limited marine habitats.
Key Research Activities & Methodology
The doctoral researcher will gain hands-on experience in a wide variety of state-of-the-art biological and analytical methodologies:
- Field Sampling: Participate in field sampling campaigns targeting deep-sea sites, intertidal mud zones, mud volcanoes, and hydrocarbon seeps.
- Enrichment Cultivation: Establish anaerobic cultures from marine sediments fueled by volatile hydrocarbon mixtures.
- Advanced Analyses: Employ metagenomics, community amplicon sequencing, fluorescence in situ hybridization (FISH), confocal laser scanning microscopy, NanoSIMS imaging, and metabolomics.
Employment Details & Funding
- Institution: Aarhus University, Denmark
- Department: Department of Biology – Microbiology (Research Group Archaea)
- Location: Ny Munkegade 114, DK-8000 Aarhus C, Denmark
- Start Date: May 2026 or later
- Funding: Fully funded PhD position, including a competitive Danish salary scale, employment benefits, and research support.
Candidate Qualifications
Candidates must hold or be close to completing a Master’s degree (MSc) in Biology, Microbiology, Biochemistry, Molecular Biology, Bioinformatics, Microbial Ecology, or a closely related field. Successful applicants should demonstrate:
- Solid laboratory skills and research experience in molecular biology or microbiology.
- Excellent communication skills in English (both written and oral).
- A collaborative mindset and enthusiasm for working in interdisciplinary teams.
How to Apply
Applications open on 1 December 2025 and must be submitted online before the deadline of 1 February 2026 at 23:59 CET.
- Visit the official application portal: Aarhus University PhD Application Portal.
- Select the February 2026 Call.
- Select the Biology program.
- Choose the project study: “Hunt for new clades of anaerobic hydrocarbon-oxidizing microbes (Hncahm)”.
For general guidelines and required documentation, refer to the official Aarhus University Application Guide.
Frequently Asked Questions
1. What are anaerobic hydrocarbon-oxidizing microbes?
These are specialized microorganisms that can degrade hydrocarbons such as ethane, propane, or butane in anoxic (oxygen-depleted) environments, usually by coupling it with the reduction of sulfate or other electron acceptors. They are crucial for deep-sea carbon cycles.
2. Is the PhD position fully funded?
Yes. Aarhus University offers fully salaried PhD positions under Danish public employment regulations, covering tuition fees, research expenses, and providing a standard monthly salary.
3. Do I need previous experience with marine field sampling?
No. While experience in microbiology, molecular biology, or bioinformatics is highly valued, prior experience in marine sampling or deep-sea expeditions is not mandatory.