Brine pools, on one hand, provide the basis for life through chemosynthesis for creatures living near them on the bottom of the ocean. On the other hand, the fluid they contain is extremely toxic to many forms of sea life. Here we see creatures that have ventured inside the dangerous interior of the brine pool and failed to return.
During two cruise legs in May of the 2015 E/V Nautilus field season, we deployed remotely operated vehicle (ROV) Hercules to examine some of the cold seep features of the deep Gulf of Mexico.
At some seep sites, seawater interacts with ancient salt deposits found deep in the seafloor, producing a highly saline fluid (brine) that can be more than four times more saline than seawater. When this brine is expelled, it is far denser than the overlying seawater and does not mix very easily with it. In some cases, the brine forms large pools, rivers or lakes.
This highly saline environment is toxic for most organisms, but we did encounter beds of mussels and fields of tube worms that have adapted to life in this extreme habitat by processing seep gases and chemicals into energy. A larger brine pool was dubbed the “Hot Tub of Despair,” referring to its warm temperature (19°C) and high salt content—which can be fatal to many animals unlucky enough to fall in. This site was found nearly 3,300 feet below the surface of the Gulf of Mexico and is a circular pool 100 feet in circumference and 12 feet deep.
We are studying these unique brine pools to better understand how they form, how they may change over time, and how the organisms living near them are able to survive—and even thrive. We analyzed water samples, conducted high-resolution mapping, and completed extensive visual surveys to gather data on these sites that our science partners continue to analyze.
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E/V Nautilus is exploring the ocean studying biology, geology, archeology, and more. Watch http://www.nautiluslive.org for live video from the ocean floor. For live dive updates follow along on social media at http://www.facebook.com/nautiluslive and http://www.twitter.com/evnautilus on Twitter. For more photos from our dives, check out our Instagram @nautiluslive.
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