Less polar bear cubs surviving in Alaska

Far fewer polar bears cubs are surviving off Alaska's northern coast, a federal government report released Wednesday has concluded.

The study of polar bears in the south Beaufort Sea, which spans the northern coasts of Alaska and western Canada, also found that adult males weigh less and have smaller skulls than those captured and measured two decades ago.

The study does not directly blame the changes on a decline in sea ice. However, fewer cubs and smaller males are consistent with other observations that suggest changes in sea ice may be adversely affecting polar bears, the study said.