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Invasive Alien Species

Aichi Biodiversity Target Nine – Invasive Alien Species – focuses on the reduction of threats to biodiversity and ecosystems from invasive alien species. It states: By 2020, invasive alien species and pathways are identified and prioritized, priority species are controlled or eradicated, and measures are in place to manage pathways to prevent their introduction and establishment. 

Invasive alien species are one of the main drivers of biodiversity loss in many ecosystems, and particularly in island ecosystems. They can pray on native species or outcompete them for resources. In addition, invasive alien species can carry enormous social and economic costs by posing a threat to food security, water supplies, human health and economic development. To reduce the threat from them, countries will need to identify the extent and distribution of prioritized invasive alien species; gauge their impact on key biodiversity and ecosystems, including economic impacts. They will also need to take steps to reduce pressures and future threats, including early detection and prevention of new introductions; controlling or eradicating existing populations; and developing national invasive species plans. 

Target 9 indicators may include status and trends in: 

  • Distributions of key invasive species
  • Impacts of key invasive species on biodiversity and ecosystems
  • Economic impacts of key invasive alien species
  • Policy responses, including legislation, management plans, early detection and control efforts

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