A conservationist in Wales is halfway through a pioneering two-year research project that could transform how we track the condition of the nation’s peatlands. Georgina Paul, collaborating with Butterfly Conservation, is investigating whether the endangered large heath butterfly might serve as a dependable measure of peat bog condition across some of Wales’s most valuable wetland environments. The project, which began last year and will run until May 2027, requires counting large heath populations across hundreds of square kilometres of protected peat bogs, from Ceredigion to the Wrexham-Shropshire border. If effective, the research could give volunteers with a simple yet effective way to track environmental changes whilst simultaneously helping address climate change by ensuring these vital carbon stores remain healthy and intact.
The Large Heath as Ecological Indicator
The great heath butterfly, with its characteristic chestnut markings and striking black spots, has become the focus of this extensive conservation initiative because of its highly specialised habitat requirements. Occurring only in damp peatland habitats across northern 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 extreme specialisation makes the large heath an ideal biological indicator—where the butterfly thrives, the peatland ecosystem is functioning well, and carbon sequestration remains secure.
Georgina Paul believes that by training volunteers to perform basic weekly butterfly surveys along established pathways, Butterfly Conservation can collect crucial data on wetland condition without needing specialist knowledge. The approach transforms citizen scientists into conservation observers, democratising conservation science across Welsh wetland areas. Should the large heath emerge as a reliable indicator, the project could substantially alter how land managers and conservation organisations approach peatland management, delivering concrete evidence of conservation gains or losses that informs upcoming conservation approaches.
- Large heath caterpillars eat solely hare’s-tail cottongrass plants
- Species numbers declined significantly during the twentieth century
- Now designated as at risk in England and Wales
- Restricted to moisture-rich areas in northern parts of Britain
Assessing Progress Across Welsh Wetland Regions
Georgina Paul’s two-year research project, now midway into its schedule until May 2027, covers an extensive geographical scope that stretches across Wales’s largest peat bog areas. Her team has been systematically monitoring heath butterfly numbers since the start of the initiative in the previous year, carrying out regular weekly assessments along established pathways to collect reliable, standardised information. This systematic method allows scientists to identify patterns in butterfly numbers that correlate directly with the state of peatlands, creating a long-term documentation of how these fragile ecosystems respond to conservation work and environmental pressures. The sheer scale of the project—spanning hundreds of square kilometres of protected habitat—represents one of the most extensive butterfly monitoring initiatives Wales has undertaken in the past decade.
The investigative team is especially interested in detecting tangible progress at sites where restoration work has already commenced, seeking concrete proof that protective actions are delivering benefits for both the large heath and the overall wetland habitat. Beyond traditional butterfly counts, the project is pioneering novel technological solutions, testing drones to map peatland habitats and quickly locate significant plant communities. This blend of volunteer-led fieldwork and advanced drone technology creates a solid surveillance structure that can track environmental changes with exceptional precision, ultimately furnishing land managers and environmental organisations with the data necessary to make informed management decisions.
Key Investigation Sites and Geographic Scope
- Cors Caron near Tregaron in Ceredigion, a major peatland reserve
- Afon Eden in Gwynedd, protecting large heath populations in northern Wales
- The Berwyn Range in north-east Wales, encompassing multiple habitat types
- Fenn’s, Whixall and Bettisfield Mosses NNR near Wrexham
- All conservation sites where large heath butterfly populations are presently located
Why Peatland Wellbeing Matters Globally
Peatlands constitute one of Earth’s most critical carbon storage systems, yet their importance remains underestimated in broader climate discussions. These saturated habitats build up partially decomposed plant material over millennia, trapping vast quantities of carbon that would otherwise increase atmospheric greenhouse gases. When peatlands stay wet and intact, they act as highly effective carbon sinks, storing carbon at rates far surpassing most other terrestrial habitats. However, this delicate balance is increasingly threatened by rising global temperatures, which deplete moisture from peat bogs and initiate the release of stored carbon into the atmosphere, producing a self-reinforcing cycle that speeds up climate change.
The decline of peatlands has widespread consequences that go well beyond carbon emissions. Damaged peat bogs lack the ability to sustain specialised wildlife, including uncommon species like carnivorous sundews and emperor moths alongside the large heath butterfly. Furthermore, well-maintained peat bogs provide essential ecosystem services including water filtration, flood control, and nutrient cycling that benefit human communities downstream. By monitoring large heath populations as a measure of peatland condition, conservationists can detect degradation early and carry out restoration measures before lasting deterioration occurs. This forward-thinking strategy transforms butterfly surveys into a useful instrument for preserving 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 |
Conservation Work and Future Prospects
Georgina Paul’s 24-month study, funded with £249,000 by the Welsh government, is deliberately concentrated on sites where restoration work has already commenced. By directing resources towards these locations, 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 broad geographical strategy ensures that results capture varied restoration methods across the Welsh peatland network.
The research goes further than traditional field surveys, integrating cutting-edge technology to speed up environmental protection work. Drones are being trialled to map peat bog habitats and identify key plant species, particularly hare’s-tail cottongrass, which forms the sole food source for large heath caterpillars. This technological innovation has the potential to simplify habitat evaluation and allow conservation professionals to react more quickly to environmental changes. If the study conclusively shows that large heath butterflies serve as reliable indicators of peatland condition, the results could revolutionise assessment methods across the UK and give property managers with actionable, research-informed advice for responsible peatland stewardship.
Community-Driven Oversight and Development
Central to the project’s achievements is the engagement and development of participants who conduct weekly walks along fixed routes, systematically counting large heath butterflies throughout the warmer season. This ground-level strategy opens up environmental science, enabling non-specialists to contribute meaningfully in environmental monitoring. Georgina stresses that contributors lack the need for technical expertise to produce crucial information; their consistent observations form a comprehensive database 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 necessary to inform upcoming conservation plans.