Polar bears are swimming more as sea ice retreats
|A new study indicates that polar bears are swimming more |
as sea ice retreats [Credit: David McGeachy]
"Recent studies indicate that swimming may be energetically costly to polar bears," said Nicholas Pilfold. "Given the continued trend of sea ice loss, we recognize that an increased frequency in the need to engage in this behavior may have serious implications for populations of polar bears living around the Arctic Basin."
Swimming frequency and other movement factors varied between individual bears and showed differences dependent on age, sex, body size and geographic features of the region. Swims occurred more frequently in the Beaufort Sea than in Hudson Bay. Researchers noted that females with young cubs tended to swim less to avoid submersion of youngsters in cold waters, while lone subadults swam as frequently as lone adults. The longest recorded swim in the study was by a subadult female that traveled over 249 miles (400 kilometers) in nine days.
Source: Zoological Society of San Diego [April 20, 2016]