Invasive Non-Native Species

An invasive non-native species (INNS) is a species that is not native to a specific location and which has a tendency to spread to a degree which causes damage to the environment, the economy or human health.

Globally, INNSs have been implicated as a sole or prodominant cause of extinction of 60% of native species. With the IUCN listing INNSs as the number one threat to biodiversity. UK freshwaters and native species are impacted by a range of plant and animal INNSs with the River Thame and its tributaries being no exeption.

Extensive research and efforts have been made in control and erradication of INNSs locally, nationally and internationally. The unfortunate reality is that once estabilished, few species can be eradicated with even effective control being challenging.

RTCT aim is to promote best practice to limit further introducts and spread of already established species. Additionally, we undertake control efforts for Himilayan Balsam are working to understand the benefits of control of Signal Crayfish currently undertaken in localised areas. We are also embarking on an ambitious programme of mink control in the catchment.

See the guidance sources below for how you can prevent the spread of invasive species.

Below are some of the most significant invasive species in the Thame catchment:
(Click the images to be taken to for more information)

Other invasive species that have been recorded at least once in the catchment include bloody-red mysid, giant hogweed, Japanese knotweed, least duckweed, Nutall’s waterweed, parrot’s feather, water fern and zebra mussel.

What can you do to help?

Visit the GB Non-native Species Secretariat website for detailed guidance on how you can prevent the spread of invasive species.

We need your eyes to help us map the locations of invasive non-native species. This will help us take appropriate action.

If you are interested in surveying for non-native invasive species please email us at RTCT organises invasive species control work parties during the summer, like balsam bash events to control Himalayan balsam.

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