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Major global changes(e.g., human impactor climatic cycles) have a severe impact on the distribution and diversity of species suchas the vulnerable European noble crayfish Astacus astacus. This is thefirst large-scale study regarding haplotype diversity of A. astacus incentral and southeastern Europe. We analyzed a partial sequence of the mitochondrial genecytochrome oxidase subunit I from 416 specimens of 92 crayfish stocks of three Europeanriver basins (Black Sea, North Sea and Baltic Sea). Twenty-two haplotypes were identified,and one common haplotype was found across the whole study area. We detected differences inthe genetic diversity between major river catchments (ΦST:0.03481 to 0.20387). The high haplotype diversity(HD = 0.794 ± 0.024) and high number of private haplotypessuggests a glacial refuge in the Balkan area. The very low haplotype diversity in centralEurope (HD = 0.299 ± 0.038 andHD = 0.163 ± 0.058) could be a result of human translocationand/or founder effects due to postglacial re-colonization. Nevertheless, the highfrequency of private haplotypes in all major catchment areas indicates a differentiationof noble crayfish populations throughout Europe despite the extensive human translocationof crayfish. The results of this study support the establishment of conservationmanagement plans for this vulnerable species

knowledge and management of aquatic ecosystems

The first large-scale genetic analysis of the vulnerable noble crayfish<i>Astacus astacus</i>reveals low haplotype diversity in central European populations

The first large-scale genetic analysis of the vulnerable noble crayfishAstacus astacusreveals low haplotype diversity in central European populations