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Alien invaders

A tale of two crayfish

The introduction of non-native species to new habitats is usually seen as a threat to native biodiversity. What are the impacts of these alien invasions? Are they always bad? Ecologist Zara Gladman explores the stories of two very different non-native crayfish in Scotland

We must make no mistake. We are seeing one of the great historical convulsions of the world’s fauna and flora.

Charles Elton (1958) The Ecology of Invasions

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Previous

Could rabies be eliminated?: how to eradicate a disease

Next

Bee-eaters in aerial combat

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