A new predator introduced to an island often drives native species to extinction. Why are island species particularly vulnerable?

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Question

A new predator introduced to an island often drives native species to extinction. Why are island species particularly vulnerable?

Accepted Answer

They evolved without that predator, so they have no defences against it — Award 1 mark. With no selection pressure from the predator, island species may lack fear, camouflage or escape behaviour, as with flightless birds and introduced rats.

Answer

Island species reproduce more slowly than mainland species

Answer

Predators on islands are larger than the species they hunt

Answer

Islands have a smaller food supply than the mainland

Answer

They evolved without that predator, so they have no defences against it

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