地理漫步·世界地理英语30篇（4）

18 / 30

白令海峡：连接两洋与生物迁徙廊道的狭窄水道

Only 85 kilometers wide, the Bering Strait separates Russia and Alaska while linking the Pacific and Arctic Oceans.
Its shallow depth—less than 50 meters—allowed human and animal migrations during Pleistocene glacial low-sea stands.
Cold Arctic waters flow south while warmer Pacific waters move north, creating turbulent mixing zones rich in plankton.
Gray whales travel 20,000 km annually through this corridor, feeding in Arctic shelves and calving in Mexican lagoons.
Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season.
Submarine canyons channel deep-water currents that affect regional ocean heat distribution and sea-level rise projections.
Indigenous communities rely on seasonal sea-ice platforms for hunting seals and walruses across dynamic frozen terrain.
Oil exploration and increased vessel traffic raise risks of spills in waters with limited response capacity and slow biodegradation.
Tidal ranges exceed three meters here, exposing intertidal zones where clams and crabs support migratory shorebirds.
Geopolitical boundaries cross ecologically unified marine space, demanding cooperative monitoring of shared species and habitats.