Biased sex ratio in the European eel (Anguilla anguilla) swimbladder parasite Anguillicola crassus, experimentally induced by 11-ketosterone

Abstract : Parasites are intimately connected to the host in which they live, and some may be affected by the polluted environment of their host. The present study describes the effect of a steroid hormone (11-ketotestosterone) on the sex ratio of the invasive hematophagous nematode Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974, when experimentally injected to European eels, Anguilla anguilla, Our results showed that this steroid induced a significant male-biased ratio in the nematode A. crassus infrapopulations, suggesting that the presence of endocrine disruptors in the environment may lead to skewed sex ratios among parasites.
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G. Fazio, H. Moné, G. Mouahid, P. Sasal. Biased sex ratio in the European eel (Anguilla anguilla) swimbladder parasite Anguillicola crassus, experimentally induced by 11-ketosterone. The Journal of Parasitology, 2008, 94, pp.956-958. ⟨10.1645/GE-1486.1⟩. ⟨halsde-00344534⟩

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