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By Mischa Dijkstra, Frontiers science writer Diseased sponges. Image credit: Fikret Öndes In 2021, divers off the Turkish Aegean coast first observed dark stinging sponges dying in great numbers. Researchers have now sampled three species of pathogenic Vibrio bacteria, previously known to infect unrelated marine animals, from diseased and dying sponges. Evidence suggests that vibriosis may be a secondary illness that affects already weakened sponges, but is not necessarily the primary agent of the novel disease. Vibrio bacteria, named for their vibrating swimming motion, span approximately 150 known species. Most Vibrio live in brackish or salt water, either swimming free or living as pathogens or symbionts in fish, crustaceans, molluscs, and corals. Because Vibrio thrive at relatively high temperatures, outbreaks in marine animals are expected to become ever more frequent under global warming. For example, over the past few decades, Vibrio have been implicated in the ‘bleaching’ of subtropical and tropical corals around the world. Now, researchers from Spain and Turkey have shown that Vibrio bacteria also play a role in outbreaks of mortality of an unrelated sessile marine organism, the dark stinging sponge (Sarcotragus foetidus). The results are published in Frontiers in Microbiology. “Here we show that pathogenic Vibrio […]
