A team of researchers analyzed a 460,000-year fish fossil record from the warmest area in the Pacific Ocean, called the Pacific Warm Pool.
The mesopelagic zone is a dark ocean ecosystem that ranges in depth from 200 to 1000 meters and is home to a diverse range of marine organisms. These fish and other animal species found here play an important part in the marine food webs that exist between the surface and deep seas.
For this new study, the team examined “1,130 carbonate inner-ear fossils called otoliths from fish spanning four glacial cycles.” They identified over 28 taxa and 12 families of mesopelagic fish among them. The lanternfish family dominated 73.7 percent of the samples. They then matched the collected data to ocean temperature records from the same time period and location.
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