B6. Pressure from invasive species

a. Freshwater invasive species

b. Marine (coastal) invasive species

c. Terrestrial invasive species

 

Type: Pressure Indicator

 

Indicator Description

Non-native species are those that have reached Great Britain by accidental human transport, deliberate human introduction, or which arrived by natural dispersal from a non-native population in Europe.  Species that arrived since 1500 are included within this indicator.  Most non-native species are considered benign or positive but some have a negative impact on native species through the spread of disease, competition for resources, or by direct consumption, parasitism or hybridisation and are termed invasive.  Invasive non-native species have one or more of these negative impacts and a high capacity for spread to natural and semi-natural habitats.  The indicator shows the change in number of invasive non-native species established across more than 10% of the land area of Great Britain, or more than 10% of the extent of the coastline.

Summary

 

Of the 3,056 non-native species in Great Britain, 1,957 are considered to be established, and of those 183 are considered to be exerting a negative impact on native biodiversity in Great Britain. 

Over the period 1960–2016, non-native species have become more prevalent in the countryside.  The number of these invasive non-native species established in or along more than 10% of Great Britain’s land area or coastline has increased since 1960 in the freshwater, terrestrial and marine (coastal) environments, increasing the likely pressure on native biodiversity.

For the latest period 2010–2016, compared with 2000–2009, the number of these established in or along more than 10% of Great Britain’s land area or coastline has remained stable for freshwater species, at 12 species, and has increased for marine species, from 18 to 28.  Terrestrial species have decreased from 58 to 56.

 

Figure B6i.  Number of non-native invasive species established in or along more than 10% of Great Britain’s land area or coastline, 1960 to 2016.

Figure B6i. Number of non-native invasive species established in or along more than 10% of Great Britain’s land area or coastline, 1960 to 2016.

 

Notes: The last time period covers a shorter period than the other bars (2010–2016).

Source: Botanical Society of Britain & Ireland, British Trust for Ornithology, Centre for Ecology & Hydrology, Marine Biological Association, National Biodiversity Network

 

Assessment of change in the number of non-native invasive species established in or along more than 10 per cent of Great Britain’s land area or coastline

 

Long term

Short term

Latest year

Freshwater invasive species

indicator declining
1960–2016

Not assessed

Not assessed

Marine (coastal) invasive species

indicator declining
1960–2016

Not assessed

Not assessed

Terrestrial invasive species

indicator declining
1960–2016

Not assessed

Not assessed

 

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Last updated: July 2017

Latest data available: 2016