A-LevelBiologySelection and evolutionMay/June 2024Paper 4 Q415 Marks
White-clawed crayfish, Austropotamobius pallipes, live in rivers and lakes in Europe. In the 1850s, the North American signal crayfish, Pacifastacus leniusculus, was introduced to Europe. The introduced species carried a pathogen that causes a disease known as crayfish plague. This disease kills A. pallipes. Since 1850, the population size of A. pallipes has reduced in many areas of Europe due to the spread of crayfish plague.
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