PhD Studentship: Methane on the Move – Investigating Benthic and Planktonic Drivers of Methanotroph Ecology in Lakes University of Birmingham in United Kingdom

[Funding covers annual stipend, tuition fees (at home-fee level), and Research Training Support Grant. International students eligible up to 30% of cohort; funding does not cover relocation or living costs.]

This PhD studentship at the University of Birmingham, in partnership with the UK Centre for Ecology and Hydrology, offers an exciting opportunity to investigate the ecological drivers of methanotroph communities in lakes. Methanotrophs play a crucial role in mediating methane emissions, a potent greenhouse gas, from freshwater environments. The project focuses on understanding how benthic (sediment-based) and planktonic (water column-based) processes interact to shape the ecology and activity of methanotrophs, with particular attention to the dynamic sources of methane in lakes.

Recent research has revealed that, in addition to sediments being dominant methane producers, phytoplankton can also generate methane under oxic conditions, especially when phosphorus is limited. Methanotrophs consume methane at the sediment-water interface, within the oxycline, and around algal particles, and their activity is influenced by interactions with other microbial groups such as heterotrophs, nitrifiers, and sulfur oxidisers. However, the ecological links between benthic and planktonic methane sources and methanotroph communities remain poorly understood.

The successful candidate will conduct field surveys in the UKCEH Cumbrian Lakes (Windermere, Esthwaite, Blelham) and participate in Lakes Tour campaigns across 20 lakes representing a range of trophic states. These surveys will capture seasonal changes in phytoplankton, benthic communities, and methanotrophs. Advanced molecular techniques, including amplicon sequencing, metatranscriptomics, and metagenomics, will be used to link microbial taxa and functional genes (such as pmoA, mmoX, phnJ) to methane cycling processes. Depth-resolved analyses will help determine which methanotroph taxa are most closely associated with sediment fluxes, phytoplankton biomass, or both.

Laboratory experiments will move from association to mechanism, enriching and isolating methanotrophs from lake water and sediment. Co-culture experiments will test the effects of phytoplankton exudates, benthic substrates, and phosphorus-limited conditions on methanotroph growth. Stable isotope probing with ¹³CH₄ will identify active methanotroph taxa, while ¹³CO₂ incubations with phytoplankton will assess whether phytoplankton-derived methane is assimilated into methanotroph biomass. These integrated approaches aim to clarify how benthic and pelagic carbon pathways intersect through the methane biofilter, with significant implications for predicting methane emissions in a changing climate.

The studentship is funded by the Natural Environment Research Council (NERC) through the CENTA3 DLA, covering an annual stipend, tuition fees at the home-fee level, and a Research Training Support Grant. International students are eligible for up to 30% of the cohort, but funding does not cover relocation or living costs. Applicants must hold at least a 2:1 UK BSc degree or a pass at UK MSc level or equivalent, and international applicants must meet the University of Birmingham’s entry requirements, including English language proficiency.

Applications should be submitted via the CENTA website. For further details on eligibility and application procedures, visit the CENTA studentship application page and the University of Birmingham’s international student requirements page. The successful applicant will be registered at the University of Birmingham and based at the UK Centre for Ecology and Hydrology.