|Vertical distribution of copepods (all developmental stages) and other zooplankton during spring bloom in the Fladen Ground area of the North Sea|
Krause, M.; Trahms, J. (1982). Vertical distribution of copepods (all developmental stages) and other zooplankton during spring bloom in the Fladen Ground area of the North Sea. Neth. J. Sea Res. 16: 217-230
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
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At a fixed station in the Fladen Ground area changes in the temporal and vertical distribution of herbivorous zooplankton were studied from 26 March to 5 June 1976. The relatively few plankton organisms present in early spring, were evenly distributed over the mixed water column. With the temperature increase in the upper layer, all developmental stages of copepods as well as bottom invertebrate larvae accumulated in the euphotic zone. The opposite was found for all stages of Microcalanus pusillus, which moved below the thermocline. Extreme diurnal vertical migrations were only performed by some copepod species. The copepodite stages of Calanus finmarchicus and Microcalanus pusillus began their diurnal vertical migrations about 10 days after the decline of the phytoplankton spring bloom. The extent of these migrations increased with the stages, nauplii and smaller copepodites usually remaining in specific water layers.