Abstract
Species of the genus Hysterothylacium are among the most common marine nematode fish parasites in the northern Atlantic. Due to recent findings of cryptic speciation in other parasitic ascaridoid nematodes, a similar pattern of sibling species was hypothesized also for Hysterothylacium aduncum. By investigating a 886- to 890-bp-long genomic DNA fragment including ITS-1, 5.8S rDNA and ITS-2 of 40 specimens of H. aduncum of sprat (Sprattus sprattus) of four different biogeographical regions (North Sea, English Channel, Bay of Biscay, Adriatic Sea), we could not detect significant genetic variability and therefore cryptic speciation. Nevertheless, while ITS-1 and 5.8S rDNA sequences were identical for all analysed specimens, ITS-2 sequences showed a population-specific pattern with the differentiation of an English Channel/Bay of Biscay group from a North Sea/Mediterranean Sea group.
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Acknowledgements
We would like to thank L. Ungerechts (Institute of Geography, Heinrich-Heine-University, Düsseldorf) for providing the map of the area of investigation. The scientific staff and crew of the different research vessels are thanked for their assistance during the sample collection. The present study was supported by the German Research Council (DFG KL 2087/1-1).
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Klimpel, S., Kleinertz, S., Hanel, R. et al. Genetic variability in Hysterothylacium aduncum, a raphidascarid nematode isolated from sprat (Sprattus sprattus) of different geographical areas of the northeastern Atlantic. Parasitol Res 101, 1425–1430 (2007). https://doi.org/10.1007/s00436-007-0662-0
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DOI: https://doi.org/10.1007/s00436-007-0662-0