Non-Native and Invasive Species

The definitions of non-native and invasive species are:

Non-native species
The term 'non-native species' is used throughout this website and is the equivalent of 'alien species' as used by the Convention on Biological Diversity (CBD). It refers to a species, subspecies or lower taxon, introduced (i.e. by human action) outside its natural past or present distribution; includes any part, gametes, seeds, eggs, or propagules of such species that might survive and subsequently reproduce.  Non-native species covered by this website include all fauna and flora with the exception of genetically modified organisms (GMOs), bacteria and viruses.
Invasive non-native species
An invasive non-native species is any non-native animal or plant that has the ability to spread causing damage to the environment, the economy, our health and the way we live.
Risk Posed by Invasive Non-native Species
They can significantly disrupt native habitats and species and natural ecosystems, and pose one of the most serious threats to biodiversity worldwide, second only to habitat loss.  The economic impacts of these species can also be severe. Indeed, it has been estimated that damage caused by invasive species amounts to almost five percent of the world economy! In Britain alone, these species cost our economy approximately £2 billion a year.
The GB Non-Native Species Secretariat
In 2008 a Strategy was developed to meet the challenge posed by invasive non-native species in Great Britain.  The GB Non-Native Species Secretariat website supports the strategy by providing information about invasive non-native species, work that is being done to tackle them across Great Britain, and provide tools to facilitate those working in this area.