Variations in the quantity of zooplankton and the propagation of calanus finmarchius at station "M" in the Norwegian Sea, 1959-1966
Research report
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http://hdl.handle.net/11250/114582Utgivelsesdato
1968Metadata
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1. From January 1959 to September 1966, 805 zooplankton samples
were collected in vertical hauls from depths of 25-0 m, 100-0 m, and
600-100 m, at weather ship station "M" in the Norwegian Sea. The
displacement volumes were measured, the developmental stage distribution
of Calanus finmarchicus was determined, and the dominating species
were noted.
2. Large seasonal and annual variations occurred in the volumes of
zooplankton from the 100 to 0 m layer, while the volumes from the 600
to 100 m layer revealed considerable constancy. In 1965 and 1966 the
plankton at station "M" appeared to be much richer and in 1961 somewhat
poorer than the average for the period 1950-1966. The density
of zooplankton in ml/m/ was very small in the 600 to 100 m layer while
the 100 to 25 m and particularly the 25 to 0 m layer showed dense concentrations
of zooplankton from April to August.
3. Calanus finmarchicus spawned in April and a second spawning of
minor importance occurred in July-September.
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