Xinhua: Latest research shows that in the last 20 years climate change has affected ecosystems in the northern Bering Sea which may threaten the life of apex predators, such as gray whale, walrus, seal in that region. The changes in the northern Bering Sea have coincided with a reduction in sea ice, and increases in air and ocean temperatures, said Cui Xuehua, a Chinese predoctoral student from University of Tennessee, U.S., who is one of the science party in the 3rd Chinese National Arctic …