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Introduced species of the British Isles
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Introduced species of the British Isles : ウィキペディア英語版
Introduced species of the British Isles

Islands, such as the British Isles, can be adversely affected by the introduction of non-native species. Often an island will have several distinct species not present on the nearest mainland, and vice versa. The native flora and fauna of islands which have been isolated for a longer period of time such as New Zealand or Hawaii (which have been isolated for millions of years) are more vulnerable than islands such as Britain and Ireland, which became isolated more recently (8,000 years ago at the end of the last ice age).
Many species have been introduced to Britain during historical times. Some species such as the midwife toad ''(Alytes)'', rainbow trout ''(Oncorhynchus mykiss)'', sweet chestnut ''(Castanea sativa)'' and horseradish ''(Armoracia rusticana)'' have been introduced with no adverse consequences. However, others such as the eastern grey squirrel ''(Sciurus carolinensis)'', signal crayfish ''(Pacifastacus leniusculus)'', and Japanese knotweed ''(Fallopia japonica)'' have had a severe impact both economically and ecologically.
==Problems caused==


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