优迈克中国www.umaclife.com.cn 点击： 时间：2012-12-04
"Why So Fast and Rich?
Incoming flood tides and outgoing ebb tides accelerate through the narrow straits and pick up more speed as they funnel through channels created by islands (inset). The tides carry and mix nutrients from immense deepwater upwellings at both the northern and southern entrances. What makes these straits an exceptional cauldron of life is the way in which ocean tides interact with fresh water from the Fraser River and from snowmelt flowing out of fjords. As the lighter outbound fresh water rides over ocean water, it pulls some of the salt water into it. This creates a vacuum of sorts that draws even more deep ocean water—and more nutrients—into the straits."