A groundbreaking discovery in Britain could signal a turning point for native ecosystems beleaguered by invasive species. Researchers have identified a novel fungus that specifically targets the heath-star moss, an aggressive plant that has overrun various landscapes across the UK and Europe. This development not only raises hopes for the revival of native habitats but also illustrates the potential of nature to self-regulate and restore balance.
The Invasive Heath-Star Moss: A Growing Menace
The heath-star moss has rapidly established itself throughout Britain, thriving in diverse environments such as hillsides, sand dunes, and even urban settings. Originating from the southern hemisphere, this invasive species first appeared in the UK in the 1940s and quickly proliferated, dominating local flora by the 1990s. Dr George Greiff, a researcher at Amgueddfa Cymru museum in Cardiff, describes the moss as “aggressive,” noting that it can even grow through tarmac.
With the introduction of around 2,000 non-native species into Britain, the ecological consequences have been profound. The infamous North American grey squirrel has decimated native red squirrel populations, while invasive plants like Japanese knotweed wreak havoc on infrastructure. The heath-star moss is no different, leading to the local extinction of native mosses and threatening the biodiversity that underpins vital habitats, including temperate rainforests and peatlands.
Discovery of the ‘Killer Fungus’
Dr Greiff’s journey to uncover the ‘killer fungus’ began four years ago on the Isle of Wight when he encountered dead heath-star mosses on a cliffside. Despite initial confusion over the cause of this dieback, continued observations across the UK led him to collaborate with scientists in both the UK and France. The culprit, now identified as the moss die-back fungus, represents a rare instance of nature fighting back against an invasive threat.
This fungus, while often perceived negatively, is being hailed as a “goodie” due to its targeted impact on the heath-star moss. Through meticulous DNA sequencing and lab analysis, Greiff has established that the fungus primarily affects the heath-star moss and may also impact one other moss species. Its close genetic relationship to the ash die-back fungus—responsible for the death of millions of ash trees in the UK—raises questions about the potential implications for biodiversity. However, Greiff’s findings suggest that the moss die-back fungus is a highly specific agent, unlikely to pose a broader threat to other plant species.
Ecological Implications and Future Prospects
The implications of this discovery are significant. Dr Nathan Smith, Head of Plant and Earth Science at Amgueddfa Cymru, explains that the moss die-back fungus could provide a natural solution to combat the invasive heath-star moss. Unlike traditional methods that often rely on human intervention, such as the controversial use of contraceptives for controlling grey squirrel populations, this biological control underscores a more sustainable approach to preserving native ecosystems.
As scientists aim to trace the historical presence of the moss die-back fungus through archival samples dating back to the 1880s, they hope to gain insights into its origins. Understanding the dynamics between native and invasive species offers a glimmer of hope in the face of Britain’s biodiversity crisis, where one in six species is at risk of extinction.
Why it Matters
This discovery serves as a poignant reminder of nature’s resilience and its ability to adapt in the face of adversity. As invasive species continue to threaten Britain’s rich biodiversity, the identification of a natural predator for the heath-star moss presents an exciting opportunity for ecological restoration. The moss die-back fungus not only represents a potential means of
