Rivers across the world are fragmented by dams, weirs and other barriers that block the natural movement of fish between freshwater and marine environments. This habitat fragmentation ranks among the leading drivers of biodiversity loss in freshwater ecosystems. For diadromous species — fish that migrate between sea and river to complete their life cycles — the consequences can be devastating: disrupted migrations, reduced gene flow between populations, and long-term declines in sustainability.
Yet ambitious reconnection programmes are now underway in many catchments. The critical question remains: how do we measure whether these projects genuinely succeed in restoring healthy, genetically robust populations? A new fully funded PhD studentship at Bournemouth University offers an exceptional opportunity to answer that question using cutting-edge genetic and molecular tools.
Scholarship Summary
- Host Country: UK
- Host University: Bournemouth University
- Scholarship Type: PhD Scholarships
- Eligible Countries: All Countries
- Scholarship Benefits: Full tuition fee, Living stipend, etc.
The Global Challenge Facing Migratory Fish
Diadromous fish play vital ecological roles. They transport marine nutrients into rivers, support complex food webs, and serve as indicators of overall ecosystem health. Iconic species such as the European eel (Anguilla anguilla), Atlantic salmon (Salmo salar), sea lamprey (Petromyzon marinus) and European shads (Alosa spp.) have suffered severe population crashes across Europe.
The European eel, for example, has declined by an estimated 95–98% since the 1980s, with barriers to migration among the key pressures alongside overfishing, pollution and climate change. Shads, once widespread, are now rare in UK rivers and protected under European legislation. Sea lamprey and salmon also face ongoing challenges from habitat disconnection.
Traditional monitoring — counting fish at fish passes or using electrofishing — provides only part of the picture. It rarely reveals how reconnection affects spatial distributions across entire catchments, whether gene flow is restored, or how selection pressures act differently across life stages from egg to adult. These gaps in knowledge limit our ability to design truly effective restoration strategies.
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Unlocking the Severn Project: A Landmark Case Study
In western Britain, the lower River Severn basin provides a perfect natural laboratory. Major reconnection works, including new fish passes and weir modifications at sites such as Diglis and Lincomb, were completed in 2021 as part of the Unlocking the Severn initiative. These interventions aimed to reopen historic spawning and rearing habitats for twaite shad and other migratory species that had been blocked for decades.
While early observations show fish moving upstream through the new passes, scientists still lack detailed understanding of the broader ecological and genetic responses. Do populations expand their ranges as expected? Do hybrids between shad species increase or decrease? Which life stages benefit most, and are there hidden genetic bottlenecks?
This PhD studentship at Bournemouth University will tackle exactly these questions.
What the PhD Project Will Investigate
The successful candidate will base their research on the reconnected lower River Severn catchment and its focal diadromous species: European shads (Alosa spp., with special attention to hybrids), sea lamprey, Atlantic salmon and European eel.
The core aims include:
- Mapping the current spatial and temporal distributions of these species across the basin, including how barriers (even modified ones) continue to influence movement along the river’s longitudinal gradient.
- Developing and applying novel environmental DNA (eDNA) methods — particularly sediment eDNA sampling — to assess the distribution and abundance of sea lamprey juveniles (ammocoetes) in relation to distance from the tidal limit and different habitat types.
- Using molecular tools to examine selection pressures acting on different life stages (egg, larval, juvenile and adult). The project will pay particular attention to Alosa species and their hybrids to understand how reconnection influences genetic outcomes and population viability.
These approaches combine non-invasive eDNA techniques with traditional population genetics and genomics. The work will generate high-quality, publishable datasets while advancing practical monitoring methods that regulators and conservation practitioners can apply elsewhere.
Why This Research Matters: Academic and Societal Impact
Academically, the project will fill a major gap in our understanding of how diadromous fish respond genetically and spatially to river reconnection. Novel applications of eDNA for lamprey ammocoetes and life-stage-specific selection analyses are expected to produce papers in leading journals and presentations at international conferences.
Societally, the findings will directly inform one of the most pressing debates in river management. With climate change altering rainfall patterns and increasing flood risk, pressure grows for hard-engineering solutions. At the same time, evidence mounts that restoring natural connectivity delivers multiple benefits for biodiversity and long-term sustainability. This PhD will provide robust genetic and distributional evidence on the advantages of softer, reconnection-based approaches — helping policymakers, the Environment Agency and conservation organisations make better-informed decisions that protect threatened migratory species while managing flood risk.
Fully Funded PhD Studentship: What’s Included
This is a fully funded opportunity designed to allow the successful candidate to focus entirely on their research. Funding covers:
- Waiver of tuition fees for 36 months
- A stipend to support living costs for 36 months
- Training costs and research costs for the project
The studentship is open to UK, EU and international students. The project is based at Talbot Campus, Bournemouth University, with an expected submission in 36 months and completion within 48 months. The start date is 21 September 2026.
Bournemouth University’s Doctoral College provides excellent support for postgraduate researchers, including training in research skills, opportunities to present work, and a vibrant research culture. The successful candidate will also gain valuable networking experience by discussing findings with regulators and policymakers.
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Who Should Apply for Fully Funded PhD Studentship at Bournemouth University 2026? Entry Requirements and Ideal Profile
BU PhD Studentships seek candidates with outstanding academic potential and strong motivation to complete a PhD within four years. You will normally need:
- A first-class honours degree (or equivalent GPA) or a Master’s degree with distinction (or equivalent)
- IELTS (Academic) 6.5 overall with no component below 6.0 (or equivalent) if English is not your first language — evidence required at application
In addition, strong candidates will demonstrate:
- Solid knowledge and genuine enthusiasm for molecular ecology
- Direct hands-on experience with DNA extraction, polymerase chain reaction (PCR) and downstream DNA analyses
- Strong quantitative skills, including proficiency in R or Python for data analysis
- An aptitude for troubleshooting in the lab or field
Prior experience constructing DNA libraries, especially for eDNA applications, is desirable but not essential.
If you have a background in genetics, molecular biology, ecology, conservation biology or environmental science and want to apply advanced tools to real-world freshwater restoration challenges, this project offers an ideal platform.
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How to Apply for Fully Funded PhD Studentship at Bournemouth University 2026 Before the Deadline
Applications for this competitive fully funded PhD studentship close on 30 June 2026. With the start date in September 2026, there is limited time to prepare a strong application that highlights your relevant laboratory experience, quantitative skills and passion for molecular ecology and conservation.
Visit the official programme page for full details and to submit your application: https://www.bournemouth.ac.uk/study/courses/phd-studentship-application-genetic-molecular-tools-assessing-outcomes-river-reconnection-programmes-diadromous-species-0
Prepare a compelling research proposal or personal statement that connects your background to the specific aims of this project. Strong applications will show clear understanding of the challenges facing diadromous species and how genetic and eDNA tools can address knowledge gaps in river reconnection science.
Take the Next Step in Your Research Career
This PhD studentship is more than a funded research position — it is a chance to generate evidence that can shape river restoration policy across the UK and Europe, develop expertise in high-demand techniques (eDNA, population genomics, bioinformatics), and build networks with academic, regulatory and conservation partners.
Whether your long-term goals lie in academia, government agencies, environmental NGOs, fisheries science or international conservation, the skills and publications from this project will position you strongly for the next stage of your career.
If you are ready to contribute to solutions for one of freshwater conservation’s most important challenges while advancing your expertise in molecular ecology, apply now for this fully funded PhD studentship at Bournemouth University.
Deadline: 30 June 2026 Start date: 21 September 2026
Explore the full opportunity and submit your application here: https://www.bournemouth.ac.uk/study/courses/phd-studentship-application-genetic-molecular-tools-assessing-outcomes-river-reconnection-programmes-diadromous-species-0
For more context on the river reconnection work that inspired this project, visit the Unlocking the Severn initiative: https://unlockingthesevern.co.uk/
This is a rare chance to combine rigorous science with tangible conservation impact. Don’t miss it.