Genetic signatures in an invasive parasite of Anguilla anguilla correlate with differential stock management

Journal of Fish Biology
Sébastien WielgossAxel Meyer

Abstract

In this article, it is shown that available genetic tools for the omnipresent parasite Anguillicoloides crassus in European eels Anguilla anguilla are sensitive to different immigration rates into local A. anguilla stocks for two separated river systems. Relying on four highly polymorphic microsatellite markers, it was inferred that under natural recruitment, nematode samples meet Hardy-Weinberg expectations for a single panmictic population, while genetic signals show signs for a strong Wahlund effect most likely due to very recent population mixing under frequent restocking of young A. anguilla. This was indicated by a low but significant F(ST) value among within-host populations (infrapopulations) along with high inbreeding indices F(IS) consistent over all loci. The latter signal is shown to stem from high levels of admixture and the presence of first-generation migrants, and alternative explanations such as marker- and sex-specific biases in the nematode populations could be dismissed. Moreover, the slightly increased degree of relatedness within infrapopulations in the stocked river system cannot explain the excessive inbreeding values found and are most likely a direct consequence of recent influx of already infected fis...Continue Reading

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Citations

Mar 29, 2014·BMC Evolutionary Biology·Sébastien WielgossThierry Wirth
Dec 4, 2014·PeerJ·Emanuel HeitlingerMark Blaxter
Aug 21, 2013·Trends in Parasitology·Aude Gilabert, James D Wasmuth
Nov 15, 2018·Parasites & Vectors·Rebecca Cole, Mark Viney

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