Chicago-Sized Iceberg Hid Ancient Ecosystem, Scientists Reveal

An anonymous reader quotes a report from Gizmodo: Scientists scrutinizing the seafloor beneath a calving iceberg found a remarkable array of living creatures, switching up notions of how the giant chunks of ice affect their immediate environs. The scientists investigated a region of seafloor recently exposed by the calving of a gigantic iceberg -- A-84 -- which is as large as Chicago. The team found a surprisingly vibrant community of critters on the seafloor below where A-84 was once attached to an ice shelf attached to Antarctica.

Without the 197-square-mile (510-square-kilometer) iceberg in the way, the team was able to scrutinize the seafloor at depths of 4,265 feet (1,300 meters) using the remotely operated vehicle (ROV) SuBastian. The team found large corals and sponges supporting other lifeforms, including icefish, giant sea spiders, and octopus. With the icebergs covering the seafloor, organisms below the shelf cannot get nutrients for survival from the surface. The team hypothesized that ocean currents are a critical driver for life beneath the ice sheets. The team also collected data on the larger ice sheet, whose shrinking size spells concern for the animals that live beneath it.

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