A seal wearing a helmet with an antenna might look unusual, but eight Weddell seals, each with a 580g monitoring device on their heads, have been helping Japanese researchers survey the waters under the thick ice sheet in Antarctica.
Tapped for a research project between March and November 2017 - winter in Antarctica - these seals were equipped with the head-mounted conductivity, temperature and depth sensor, which allows scientists to collect observation data, such as water temperatures and salt levels, in areas with extremely harsh environmental conditions.
"However, even in such a situation, many animals such as seals are living in the area of Antarctica, so I thought we should have them collect the data," Kokubun added. Kokubun said the scientists also learned from the data that warm seawater from the upper layer in the open sea reached Antarctica from March through winter that year. The water flowed below the ice, bringing in sea creatures like Antarctic krill, a major food source for seals.
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