What are the three lines of defence against invasive species?

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The Three Lines of Defence Against Invasive Species

Humanity's efforts to combat invasive species are structured around three primary lines of defence: prevention, eradication, and containment. These strategies are employed sequentially, with prevention being the initial and most desirable approach, followed by eradication if prevention fails, and finally containment as a last resort when complete removal is not feasible.
Prevention

Prevention focuses on stopping invasive species from entering a new environment in the first place. This can involve measures such as inspecting cargo ships for stowaway organisms, regulating the trade of potentially harmful plants and animals, and educating the public about the risks of introducing non-native species. The goal is to intercept threats before they can establish themselves and cause ecological or economic damage.
Eradication

Should prevention measures be bypassed and an invasive species establish a foothold, the next line of defence is eradication. This involves the complete removal of the introduced species from the environment. Eradication efforts have historically seen the highest success rates on small islands, particularly for vertebrates like rats. However, attempts to eradicate invasive species in large bodies of water or extensive land areas have generally proven unsuccessful.
Containment

When eradication is not possible, the strategy shifts to containment. This approach aims to limit the spread of the invasive species and prevent it from reaching new regions or expanding its impact within the existing environment. Containment strategies can include establishing buffer zones, controlling the movement of affected resources, and managing populations to minimize their detrimental effects. This represents a necessary fallback when the complete elimination of the species is unachievable.

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What are the three lines of defence against invasive species?

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