Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Diel vertical migration, also known as diurnal vertical migration, is a pattern of movement that some organisms living in the ocean and in lakes undertake each day. Usually organisms move up to the epipelagic zone at night and return to the mesopelagic zone of the oceans or to the hypolimnion zone of lakes during the day. The word diel comes from the Latin dies day, and means a 24-hour period. During World War II the Navy was taking sonar readings of the ocean when they discovered the deep scattering layer. The DSL was caused by large groupings of organisms that scattered the sonar to create a false or second bottom. The false bottom was shallower during the day and deeper during the night, this was the first recording of diel vertical migration. Once scientists started to do more research on what was causing the DSL it was discovered that a large range of organisms were vertically migrating. Most types of plankton and some types of nekton (fish) have exhibited some type of vertical migration, although it is not always diel.

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