24-29 May 2021 marks national Invasive Species Week.

We caught up with our Invasive Non Native Species Lead, Sam Pottier, to find out how he helps protect our natural environment from the threat of invasive species.

Zebra Mussels, c. NNSS


What are invasive species? And what does your role entail?

Broadly speaking, non-native species are anything which didn't evolve in the UK, including well-loved species such as rabbits and horse chestnuts. But for something to be an invasive non-native species, it has to do damage to the economy or the environment.

My role involves working with different departments in the business to maintain biosecurity – this means preventing the spread of invasive species from one site to another.

Examples of invasive species that we're particularly concerned about as a water industry are Zebra Mussels and Signal Crayfish, which can both be found in fresh water, as well as plants such as Rhododendrons, Giant Hogweed and Himalayan Balsam.

As a water company, why is South East Water concerned with removing invasive non-native species?

The species listed above are problematic for a number of reasons. 

  • Zebra mussels can clog the inside of water pipes and it has been estimated that the removal of this species alone costs the water industry more than £1 million per year.

  • Signal Crayfish carry a disease known as crayfish plague, which is lethal to the native White-Clawed Crayfish if contracted. They also burrow into river banks, impacting the bank stability and causing water quality problems due to sedimentation.

  • Rhododendrons and Himalayan Balsam spread rapidly and smother rare or precious native plants, which some animals rely upon to survive.

  • For our operational teams, Giant Hogweed is a concern because it has poisonous sap which can cause severe burns.

Giant Hogweed c. NNSS

Can you tell us more about just how you combat these species?

A lot of my role involves working with partner organisations such as other water companies, Natural England, the Angling Trust, British Canoe and local wildlife trusts, to name but a few.

To stop the spread of Himalayan Balsam, a plant native to the Himalayas which is often found near rivers, we’ve teamed up with CABI Bioscience to trial the use of a rust fungus as a natural method of weakening the plant.

Protecting the wider environment and maintaining the quality of water in rivers, aquifers and reservoirs is our number one priority so we avoid using chemical herbicides wherever possible, in favour of natural control methods.

 

How can the general public help prevent the spread of invasive species?

There are three really simple yet important things that people can do to protect the environment from invasive species.

  1. Anyone using rivers, lakes or reservoirs for activities such as water sports and angling should follow the Check, Clean, Dry procedure. Simply put this means check your equipment and clothing for anything that may be attached, clean it with fresh water and a water-safe disinfectant, then leave it to dry.

  2. If you are in the countryside, leave the area as you found it - don't be tempted to pick any flowers or plants as they may belong to an invasive species or even be dangerous.

  3. When choosing plants for your home or garden, or disposing of those you already have, ask your local garden centre for advice on all aspects of growing, managing and disposing of plants or visit the Non Native Species Secretariat website.

Find out more on our invasive species page: https://corporate.southeastwater.co.uk/about-us/our-environment/invasive-non-native-species/


"Anyone using rivers, lakes or reservoirs for activities such as water sports and angling should follow the Check, Clean, Dry procedure. Simply put this means check your equipment and clothing for anything that may be attached, clean it with fresh water and a water-safe disinfectant, then leave it to dry."

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