David José Nachón

TL;DR: While A. alosa exhibited a high level of natal site fidelity, this species showed weak genetic structure, which supported the evidence of a substantial flow of strayers between river basins in the vicinity or at longer distances.

TL;DR: The results provide information about host migration behaviour and transmission pathways through diet during the marine trophic phase of the shad’s life cycle and their roles as paratenic or final hosts and transporters of parasites between seawater and freshwater environments.

TL;DR: It is suggested that in the marine environment of the Western Iberian Peninsula, both anadromous shad species act as paratenic hosts for A. pegreffii, thus widening the distribution of the infective nematode larvae from the marine to the freshwater ecosystem.

TL;DR: Overall, contemporary and historical introgression revealed by nuclear and mitochondrial markers strongly suggests that a transfer of genes occurs from A. fallax toward A. alosa genome since at least four generations.

TL;DR: The specific stock composition and dispersion of anadromous fish species aggregations in the marine environment are poorly known, while they can play a major role in the metapopulation dynamics.