Summary Monterey Bay, off the south Californoan coast, has a complex ecosystem. Its waters support an exceptionally rich kelp forest, which feeds and houses many fish etcetera and gets extra nutrients because land winds causes rich sediment from the deep ocean channel to be lifted by currents. Sea urchins are the only species voracious enough, eating stems too, to destroy kelp long-term. Sea otters control urchins, except when human hunting eliminated them and thus the whole ecosystem, which returned when they did.

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