Interactions Between Diel Vertical Migratory Behavior of Marine Zooplankton and the Subsurface Chlorophyll Maximum
Abstract:Elevated levels of phytoplankton biomass at the subsurface chlorophyll maximum are a characteristic feature of the environment of zooplankton in areas of the continental shelf where a seasonal thermocline develops. I examined the relationship between diel vertical migration and the chlorophyll maximum, using a pump system, to sample the vertical distribution of zooplankton in thermally stratified regions of the western English Channel. I described the interactions between migratory behavior, feeding rhythms and the vertical structure of the water column, and both inter- and intra-specific behavioral differences were analyzed. I contrasted non-migratory forms resident within the phytoplankton biomass peak with active migrators. The latter group move into the chlorophyll maximum at night, or in a few cases by day, or pass through this region of the water column altogether in the course of their vertical excursions.
Document Type: Research Article
Publication date: November 1, 1988
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