A conservationist in Wales is halfway through a pioneering two-year study that could revolutionise how we monitor the health of the nation’s peat bogs. Georgina Paul, working with Butterfly Conservation, is investigating whether the threatened large heath butterfly might serve as a reliable indicator of peatland health across some of Wales’s most precious wetland habitats. The project, which started last year and will continue to May 2027, requires counting large heath numbers across hundreds of square kilometres of protected peat bogs, from Ceredigion to the Wrexham-Shropshire border. If successful, the research could provide volunteers with a simple yet effective way to track environmental changes whilst simultaneously helping tackle climate change by ensuring these important carbon reserves remain in good condition.
The Large Heath as Environmental Sentinel
The great heath butterfly, with its distinctive chestnut colouring and striking black spots, has emerged as the subject of this ambitious conservation effort because of its highly specialised environmental needs. Occurring only in wet peatland environments across northern regions of Britain, Ireland, and a small number of scattered Welsh and English locations, the species is entirely dependent on a single food source: hare’s-tail cottongrass, a plant that exists only in peat bogs. This extreme specialisation makes the large heath an perfect ecological indicator—where the butterfly flourishes, the peatland ecosystem is working effectively, and carbon storage stays protected.
Georgina Paul argues that by instructing citizen participants to perform basic weekly butterfly counts along set routes, Butterfly Conservation can obtain valuable data on wetland condition without demanding technical skills. The approach converts volunteers into environmental monitors, broadening participation in conservation across Welsh wetland areas. Should the large heath emerge as a reliable indicator, the project could significantly transform how land managers and conservation organisations approach peatland management, offering tangible proof of recovery progress or deterioration that shapes future safeguarding methods.
- Large heath caterpillars feed exclusively on hare’s-tail cottongrass plants
- Species numbers fell sharply throughout the 1900s
- Now listed as endangered in England and Wales
- Restricted to moisture-rich areas in northern parts of Britain
Assessing Progress Throughout Welsh Wetland Regions
Georgina Paul’s two-year investigation, currently halfway through its timeline through May 2027, encompasses an extensive geographic range that stretches across Wales’s most significant peatland reserves. Her research group has been regularly tracking large heath populations from the project’s commencement in the previous year, conducting weekly surveys along established pathways to collect reliable, standardised information. This methodical approach enables researchers to identify patterns in butterfly numbers that directly reflect the state of peatlands, creating a long-term documentation of how these fragile ecosystems respond to restoration efforts and environmental pressures. The sheer scale of the project—spanning hundreds of square kilometres of protected habitat—constitutes one of the most comprehensive butterfly survey programmes Wales has undertaken in the past decade.
The research team is especially interested in pinpointing measurable improvements at sites where conservation efforts has already begun, seeking concrete proof that restoration measures are yielding positive results for both the large heath butterfly and the overall wetland habitat. Beyond traditional butterfly counts, the project is developing cutting-edge methods, piloting drones to survey wetland areas and quickly locate key plant species. This blend of community-based surveys and cutting-edge aerial surveying creates a robust monitoring framework that can track environmental changes with exceptional precision, ultimately supplying property owners and conservation groups with the evidence needed to make evidence-based decisions.
Main Study Areas and Territorial Reach
- Cors Caron near Tregaron in Ceredigion, a substantial peatland conservation area
- Afon Eden in Gwynedd, protecting extensive heath communities in north Wales
- The Berwyn Range in north-eastern Wales, spanning diverse habitat varieties
- Fenn’s, Whixall and Bettisfield Mosses NNR near Wrexham
- All conservation sites where large heath butterflies are currently found
Why Peatland Wellbeing Is Globally Important
Peatlands form one of Earth’s most essential carbon sequestration mechanisms, yet their importance remains underappreciated in broader climate conversations. These saturated habitats accumulate partially decomposed plant material over millennia, sequestering vast quantities of carbon that would otherwise add to atmospheric greenhouse gases. When peatlands remain wet and undisturbed, they function as highly effective carbon sinks, storing carbon at rates far outpacing most other terrestrial habitats. However, this delicate balance is increasingly endangered by rising global temperatures, which dry out 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 extend far beyond carbon emissions. Damaged peat bogs lack the ability to sustain specialised wildlife, including rare plants like carnivorous sundews and emperor moths alongside the large heath butterfly. Furthermore, well-maintained peat bogs provide vital ecological functions including water filtration, flood regulation, and nutrient recycling that assist human communities downstream. By monitoring large heath populations as a measure of peatland condition, conservationists can identify degradation early and carry out restoration measures before irreversible damage occurs. This forward-thinking strategy transforms butterfly surveys into a practical tool 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 Outlook Ahead
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 concentrating efforts on these areas, researchers can assess if active management translates into measurable benefits for large heath butterfly 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-east Wales, and the Fenn’s, Whixall and Bettisfield Mosses National Nature Reserve near the Wrexham-Shropshire border. This broad geographical strategy ensures that results reflect diverse restoration strategies across the Welsh peatland network.
The research extends beyond conventional survey methods, integrating advanced technological solutions to speed up conservation efforts. Drones are being trialled to map peat bog habitats and identify key plant species, especially 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 respond more rapidly to environmental changes. If the study conclusively shows that large heath butterflies function as reliable indicators of peatland condition, the findings could revolutionise monitoring practices across the UK and provide landowners with actionable, research-informed advice for sustainable peatland management.
Community-Driven Oversight and Development
Central to the project’s success is the recruitment and training of volunteers who perform regular walking surveys along established pathways, systematically counting large heath butterflies throughout the warmer season. This ground-level strategy democratises conservation science, enabling members of the public to participate actively in ecological assessment. Georgina highlights that participants don’t require specialist knowledge to generate invaluable data; their consistent observations establish a strong evidence base for monitoring habitat health across seasons. By supporting community involvement to participate directly in habitat management, the project increases public participation whilst assembling information required to shape upcoming conservation plans.
