Distribution of mercury inside the Mediterranean sponge Chondrosia reniformis: A study case from the Tuscan Archipelago National Park (Tyrrhenian Sea)

Trace elements are ubiquitous substances in the marine environment, representing a problematic hazard for organisms since many of them lack any biological function. The main aim study was to investigate variation total mercury content (THg) Mediterranean sponge Chondrosia reniformis collected two islands Tuscan Archipelago, Italy. did not show harmful levels THg (seawater and sediment) no intraspecific variability detected values bioconcentration factors samples. Conversely, recorded choanosome C. were significantly higher than cortex, pointing out possible involvement microbiota bioaccumulation process. Our suggests that could be an attractive bioindicator toxic pollution coastal waters, highlighting potential use these monitoring programs areas, as suggested by various European policies. • Total investigated reniformis. No differences sponges among Montecristo Giglio islands. cortex. Possible role Hg waters.