Sharing sunscreen with family and friends is part and parcel of any trip to the seaside. Now, researchers have discovered that the seagrass Posidonia oceanica also partakes, accumulating ultraviolet filters contained in such products and cosmetics. This discovery is raising concerns about the potential effect on important seagrass ecosystems, though the full ramifications remain unclear. Researchers sampled the rhizomes of P. oceanica at three different sites on the Mediterranean island of Mallorca: at the port of the capital Palma, near the port of Alcudia, and at Ses Salines, a “pristine” si…