Anaerobic microbial breakdown of decaying phytoplankton produces hydrogen sulfide gas in the seafloor sediment, and the gas buildup is periodically released, rising and oxidizing as it approaches the water surface. (waterencyclopedia.com)
The same thing is found at present - day whale falls during the sulfophilic stage — the last and longest part of organic - fall succession, when bacteria produce hydrogen sulfide as they break down what's left of the bones. (discovermagazine.com)
Cutting protein in mice's diets increased the production of hydrogen sulfide in their livers, the researchers discovered. (sciencenews.org)