Invasive Species Threaten Cornwall’s Wildlife – How You Can Help South West Water Fight Back

Invasive species are a growing concern across the South West, and South West Water is leading the charge in the fight to protect our environment. Marcus Brown, South West Water’s Invasives Training and Awareness Officer, has been at the forefront of this battle, explaining why tackling invasive non-native species is crucial and how the public can contribute.

A Personal Journey

Marcus’ journey into the world of invasive species began 15 years ago while he was managing a nature reserve at a wastewater treatment works. He encountered Himalayan balsam, an invasive plant rapidly smothering other vegetation at Crediton sewage treatment works. Over three years, Marcus successfully eradicated the species, sparking his passion for tackling invasive non-native species.

In 2023, Marcus joined South West Water’s Invasive Species Team, where he’s found his true calling. “It’s the best job I’ve ever had,” says Marcus. From surveying reservoirs for invasive species to raising awareness at wildlife festivals, Marcus is dedicated to protecting native wildlife across the region.

The Problem with Invasive Species

Invasive non-native species are animals, plants, fungi, or microorganisms introduced by humans to areas where they would not naturally occur. They pose serious threats to the environment, economy, and even health.

South West Water has a legal obligation to control the spread of invasive species, but as Marcus explains, this is more than just a legal requirement. “As a large landowner, we have a responsibility to protect and enhance the sites we own,” Marcus says. “Invasive species can also have health and safety implications, and can impact our operations and costs.”

Among the species South West Water is focusing on are the American signal crayfish, Ruffe, Japanese knotweed, and Himalayan balsam. These species are not just harmful to native plants and wildlife—they can also affect water quality.

Innovative Methods

South West Water is at the forefront of tackling invasive species in the water industry. They were the first company to create a dedicated invasives position and now boast the largest invasives team. The company was also the first to commit to combating marine invasives.

The team is trialling innovative methods, from using underwater filmmakers to detect invasive species to specially trained dogs that can sniff out invasive crayfish. Washdown facilities have also been installed at some reservoirs to encourage the public to clean their watercraft and avoid spreading invasive species.

How You Can Help

Marcus stresses the importance of public involvement in tackling invasive species. “There are some really simple steps that people can take,” he says. Reporting sightings to local biodiversity record centres, cleaning boots and watercraft, and being vigilant can all help prevent the spread of invasive species. For example, sightings can be submitted to websites such as iRecord, or you can search for your local biodiversity record centre.

If you spot what you believe to be an invasive species on South West Water land, you can report it by emailing Marcus at mmbrown@southwestwater.co.uk.

Making a Difference

Marcus takes pride in the work he and his team are doing. “Knowing I am making a difference locally and helping protect nature on a wider scale by preventing invasive species from spreading is incredibly rewarding,” he says. The work being done by South West Water is not just protecting our local wildlife—it’s helping safeguard the environment for future generations.