| dc.description.abstract | The variations in zooplankton volume at fixed stations along the coast
of Norway, western Spitsbergen, and at st. "M" in the Norwegian Sea
have been studied during 1957 and 1958. In 1957 the plankton was on
the whole less abundant than in the previous year, and at Skrova the
spring maximum also occurred one month later than in 1956.
In 1958, the plankton volumes were again larger, except at st. "M".
Peaks in volume were observed at Skrova in May and August, at Skarsvåg
near North Cape, and Kongsfjord, western Spitsbergen, in July
and September.
Salps were abundant at Skrova and Skarsvåg in October 1958.
Vertical hauls were taken with a Nansen net in coastal and offshore
areas of northern Norway in July -August 1957. The plankton was as
a rule very scarce, except in an area west and south of Bear Island,
where about 11 ml per haul were taken, mainly Calanus finmarchicus.
In the offshore areas farther south, Aglantha digitale dominated.
A chart of the average stage distribution of C. finmarchicus revealed
a picture very similar to that represented by the isotherms at 20 m level.
Zooplankton was sampled in vertical hauls with a one metre net
in the Norwegian Sea and adjacent areas in May-June 1958. The
plankton was most abundant in the cold, northwestern parts of the sea,
and off the coast of northern Norway.
During most part of the cruise a shallow scattering layer was recorded
on an echo sounder. The recordings were quantitatively charted. In
relation to the quantitative distribution of zooplankton various discrepancies
were found. By comparing the distribution of various plankton
organisms with the echo recordings, it was found that the echoes probably
were caused by fish fry and euphausiids, some possibly also by appendicularians
and medusae.
The average stage distribution of Calanus finmarchicus during the
cruise in 1958 gives a picture very similar to that of the isotherms at 20 m. | |
