STEALTH MIGRATIONS.

EVERY EVENING AROUND THE WORLD TRILLIONS OF ZOOPLANKTON, MANY SMALLER THAN a grain of rice, hover hundreds of feet below the surface of the sea, waiting for their signal. But he noticed that the circulation of ocean water alone wouldn't bring enough nitrogen and phosphorus from the depths to feed the ocean's vast and essential blanket of phytoplankton at the surface. Fewer phytoplankton means less food for migrating zooplankton. For example, Kelly J. Benoit-Bird of the Monterey Bay Aquarium Research Institute (MBARI) in California and Mark Moline of the University of Delaware sent an autonomous underwater vehicle 1,000 feet down into the Catalina Basin off southern California to take sonar measurements of vertically migrating zooplankton. [Extracted from the article]

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