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In sediment cores spanning ~500 years of history in the Gulf of Trieste, down-core changes in molluscan community structure are characterized by marked shifts in species and functional composition. Between the 16 th  and 19 th  century, a strong heavy metal contamination of the sediments, most notably by Hg, together with the effects of natural climatic oscillations (increased sedimentation and organic enrichment) drive community changes. Since the early 20 th  century up to 2013, the combined impacts of cultural eutrophication, frequent hypoxic events and intensifying bottom trawling replace heavy metal contamination and climatic factors as the main drivers. The pollution-tolerant and opportunistic bivalve  Corbula gibba  and the scavenging gastropod  Nassarius pygmaeus  significantly increase in abundance during the 20 th  century, while species more sensitive to disturbances and hypoxia such as  Turritella communis  and  Kurtiella bidentata  become rare or absent. An infaunal life habit and scavenging emerge as the dominant life strategies during the late 20 th  century. Down-core shifts in the proportional abundances of molluscan species and functional groups represent a sensitive proxy for past ecological changes and reveal a century-long anthropogenic impact as the main driver behind these processes in the northern Adriatic Sea, offering also a unique perspective for other shallow marine ecosystems worldwide.

Responses of molluscan communities to centuries of human impact in the northern Adriatic Sea