Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: Schrimpf A, Schulz H K, Theissinger K, Pârvulescu L, Schulz R
Editorial: ONEMA, Knowledge and Management of Aquatic Ecosystems, 401, p.35, 2011.
Major global changes (e.g., human impact or climatic cycles) have a severe impact on the distribution and diversity of species such as the vulnerable European noble crayfish Astacus astacus. This is the first large-scale study regarding haplotype diversity of A. astacus in central and southeastern Europe. We analyzed a partial sequence of the mitochondrial gene cytochrome oxidase subunit I from 416 specimens of 92 crayfish stocks of three European river 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 in the 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 haplotypes suggests a glacial refuge in the Balkan area. The very low haplotype diversity in central Europe (HD = 0.299 ± 0.038 and HD = 0.163 ± 0.058) could be a result of human translocation and/or founder effects due to postglacial re-colonization. Nevertheless, the high frequency of private haplotypes in all major catchment areas indicates a differentiation of noble crayfish populations throughout Europe despite the extensive human translocation of crayfish. The results of this study support the establishment of conservation management plans for this vulnerable species.
Cuvinte cheie: mtCOI sequences, haplotype diversity, human translocation, conservation management, evolutionary significant units (ESU)