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Translocation and aquaculture impact on genetic diversity and composition of wild self- sustainable Ostrea edulis populations in the Adriatic Sea

The European flat oyster, Ostrea edulis, is a keystone species suffering major population declines due to overfishing, habitat loss and parasite diseases. Knowledge of its fine-scale population genetic structure and connectivity, needed for effective conservation, restoration and management, is largely lacking. Along the eastern Adriatic Sea, genotyping of 1178 O. edulis individuals at 13 microsatellite loci was conducted, grouping the sampled populations by geographical origin (North, Middle, South Adriatic), shell-farm association (farmed, farm- impacted, wild oysters) and sampling year (2017, 2018), in order to explore spatio-temporal genetic variation and potential footprint of known human- mediated spat translocation events for aquaculture purpose.

aquaculture, bivalve, European flat oyster, spat translocation3, genetic diversity, effective size, sPCA.

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