A environmental scientist in Wales is midway through a pioneering two-year research project that could transform how we monitor the condition of the nation’s peat bogs. Georgina Paul, working with Butterfly Conservation, is investigating whether the endangered large heath butterfly might serve as a dependable measure of peatland health across some of Wales’s most precious wetland habitats. The project, which began last year and will run until May 2027, involves counting large heath numbers across hundreds of square kilometres of protected peatland, from Ceredigion to the Wrexham-Shropshire border. If successful, the research could provide volunteers with a straightforward yet powerful way to monitor environmental shifts whilst also helping address climate change by guaranteeing these vital carbon stores remain in good condition.
The Great Heath as Ecological Indicator
The large heath butterfly, with its characteristic chestnut markings and prominent black markings, has emerged as the subject of this ambitious conservation effort because of its uniquely specialised environmental needs. Occurring only in wet peatland environments across northern regions of Britain, Ireland, and a handful of isolated Welsh and English locations, the species is completely reliant on a sole food plant: hare’s-tail cottongrass, a plant that exists only in peat bogs. This high degree of specialisation makes the large heath an perfect ecological indicator—where the butterfly thrives, the peatland environment is functioning well, and carbon storage stays protected.
Georgina Paul believes that by training volunteers to conduct simple weekly butterfly counts along set routes, Butterfly Conservation can collect crucial data on wetland condition without requiring technical expertise. The approach converts volunteers into conservation observers, broadening participation in conservation across wetlands throughout Wales. Should the large heath prove to be a trustworthy measure, the project could substantially alter how land managers and conservation organisations approach peatland management, offering tangible proof of conservation gains or losses that informs upcoming conservation approaches.
- Large heath caterpillars eat solely hare’s-tail cottongrass plants
- Species numbers declined significantly throughout the 1900s
- Now classified as threatened in England and Wales
- Restricted to moisture-rich areas in northern British regions
Assessing Progress Across the Welsh Wetland Areas
Georgina Paul’s 24-month research project, now midway into its timeline until May 2027, covers an extensive geographic range that stretches across Wales’s most significant peat bog areas. Her team has been systematically monitoring large heath populations since the project’s commencement last year, carrying out regular weekly assessments along predetermined routes to gather reliable, standardised information. This systematic method allows researchers to identify patterns in butterfly abundance that directly reflect peatland condition, creating a long-term documentation of how these fragile ecosystems react to conservation work and ecological stresses. The vast scope of the project—spanning hundreds of square kilometres of protected habitat—constitutes one of the most extensive butterfly monitoring initiatives Wales has undertaken in the past decade.
The investigative team is especially interested in detecting quantifiable gains at sites where conservation efforts has already started, seeking tangible evidence that protective actions are producing favourable outcomes for both the large heath and the broader peatland ecosystem. Beyond conventional species surveys, the project is pioneering innovative technological approaches, testing drones to map peatland habitats and swiftly pinpoint important vegetation types. This integration of volunteer-led fieldwork and state-of-the-art aerial mapping creates a robust monitoring framework that can record habitat variations with unprecedented accuracy, ultimately furnishing land managers and environmental organisations with the information required to make informed management decisions.
Main Study Areas and Geographic Scope
- Cors Caron near Tregaron in Ceredigion, a significant peatland conservation area
- Afon Eden in Gwynedd, protecting large heath populations in north Wales
- The Berwyn Range in north-eastern Wales, encompassing multiple habitat types
- Fenn’s, Whixall and Bettisfield Mosses NNR near Wrexham
- All designated reserves where large heath butterflies are currently found
Why Peatland Health Is Globally Important
Peatlands represent one of Earth’s most critical carbon storage systems, yet their significance remains underappreciated in broader climate conversations. These saturated habitats build up partially decomposed plant material over millennia, locking away vast quantities of carbon that would otherwise increase atmospheric greenhouse gases. When peatlands stay wet and intact, they function as highly effective carbon sinks, sequestering carbon at rates far exceeding most other terrestrial habitats. However, this delicate balance is increasingly at risk from rising global temperatures, which desiccate peat bogs and initiate the release of stored carbon into the atmosphere, establishing a feedback loop that accelerates climate change.
The decline of peatlands has cascading consequences that reach well past carbon emissions. Damaged peat bogs lose their capacity to support specialised wildlife, including rare plants like carnivorous sundews and emperor moths alongside the large heath butterfly. Furthermore, healthy peatlands provide essential ecosystem services including water filtration, flood control, and nutrient cycling that support human communities downstream. By monitoring large heath populations as an indicator of peatland condition, conservationists can identify degradation early and implement restoration measures before permanent harm occurs. This forward-thinking strategy transforms butterfly counts into a practical tool for protecting both biodiversity and climate resilience.
| Peatland Benefit | Environmental Impact |
|---|---|
| Carbon Storage | Stores more carbon per hectare than forests; wet peatlands prevent greenhouse gas release |
| Biodiversity Support | Provides habitat for specialised species including endangered butterflies and carnivorous plants |
| Water Management | Filters water naturally and regulates flood risk through water absorption and gradual release |
| Climate Regulation | Contributes to global climate stability by maintaining carbon sequestration rates |
Restoration Efforts and Outlook Ahead
Georgina Paul’s two-year study, supported by £249,000 by the Welsh government, is deliberately concentrated on sites where restoration work has already commenced. By directing resources towards these areas, researchers can assess if active management delivers tangible improvements for large heath populations. The project encompasses all protected peatland areas where the butterfly survives, including Cors Caron near Tregaron in Ceredigion, Afon Eden in Gwynedd, the Berwyn Range in north-eastern Wales, and the Fenn’s, Whixall and Bettisfield Mosses National Nature Reserve near the Wrexham-Shropshire border. This comprehensive geographical approach ensures that results reflect varied restoration methods across the Welsh peatland network.
The research goes further than conventional survey methods, incorporating advanced technological solutions to accelerate environmental protection work. Drones are being trialled to map peat bog habitats and identify key plant species, especially hare’s-tail cottongrass, which forms the only food supply for large heath caterpillars. This technological innovation promises to streamline habitat assessment and allow conservation professionals to respond more rapidly to ecological shifts. If the study successfully demonstrates that large heath butterflies serve as reliable indicators of peatland health, the findings may transform monitoring practices across the UK and give property managers with practical, evidence-based guidance for responsible peatland stewardship.
Volunteer-Powered Monitoring and Advancement
Central to the project’s success is the recruitment and training of participants who perform weekly walks along established pathways, systematically counting large heath butterflies throughout the warmer season. This community-led initiative democratises conservation science, empowering untrained individuals to participate actively in environmental monitoring. Georgina stresses that participants don’t require technical expertise to produce crucial information; their regular monitoring establish a strong evidence base for assessing wetland status throughout the study period. By supporting community involvement to take an active role in habitat management, the project strengthens community involvement whilst collecting data required to shape forthcoming habitat safeguarding approaches.
