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Whale falls – studying how decaying carcasses may become deep sea biodiversity generators

The New Yorker – “…Whale falls, as marine biologists call such events, create pop-up habitats that may serve as stepping stones for organisms migrating from methane seeps or hydrothermal vents to other parts of the ocean. Precisely how this works, and which species colonize the carcass as it degrades, were open questions…In the late two-thousands, Rouse and Eddie Kisfaludy, then an operations manager for Virgin Oceanic, had begun meeting with officials from the National Oceanic and Atmospheric Administration (NOAA) and the city of San Diego to pitch an alternative approach to the disposal of dead whales. Often, whales that wash up on shore are hauled to landfills or pushed back into the water. Rouse and Kisfaludy wanted to tow one out to sea, sink it to the seafloor, and watch what happened. Whale falls, as marine biologists call such events, create pop-up habitats that may serve as stepping stones for organisms migrating from methane seeps or hydrothermal vents to other parts of the ocean. Precisely how this works, and which species colonize the carcass as it degrades, were open questions that Rouse hoped to answer…Whale falls may occur as frequently as every ten miles on the seafloor; at any given time, there are likely hundreds of thousands of them around the world. A 2015 review paper by the deep-sea ecologist Craig Smith, at the University of Hawaii at Manoa, and a number of collaborators proposed that decaying whale carcasses may serve “as a sort of biodiversity generator,” allowing organisms from different energy-rich seafloor oases, such as thermal vents or methane seeps, to mingle. The importance of these deep-sea ecosystems makes whale falls especially fascinating. Seafloor microbes consume methane, which is a greenhouse gas, and provide biomass that ultimately sustains fish populations. Rouse’s team is monitoring a number of habitats around Rosebud to understand how they’re connected, and how deep-sea oases like whale falls and seeps might drive evolution…”

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