Observations on the vertical distribution of zooplankton, including post-larval teleosts, off Plymouth in the presence of a thermocline and a chlorophyll-dense layer

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Abstract
During 1973 – 1977, when Sagitta elegans was returning to dominance over S. setosa in Plymouth waters, there was often, in summer in stratified conditions, a community characterized by S. setosa in the warm water above the thermocline, and a typical S. elegans community in the colder layer below the thermocline. This vertical separation persisted at night even though some species from the S. elegans community migrated up into the warm layer. Such vertical migration was not stopped by a temperature discontinuity of from 3° to 6°C, but fewer individuals, or a lesser proportion of species, took part at the higher temperature difference. Only a small part of the zooplankton, comprising small individuals of Limacina retroversa, the appendicularians, and, possibly, post-larvae of Arnoglossus laterna, showed signs of aggregation at the thermocline or the chlorophyll maximum close to it.

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