Ocean Science
www.ocean-sci.net
1812-0784
1812-0792
2
2
2006
10.5194/os-2-87-2006
http://www.ocean-sci.net/2/87/2006/
http://www.ocean-sci.net/2/87/2006/os-2-87-2006.html
http://www.ocean-sci.net/2/87/2006/os-2-87-2006.pdf
87
96
2006-07-25
Distribution of overwintering <i>Calanus</i> in the North Norwegian Sea
A. Edvardsen
edvard@nfh.uit.no
J. M. Pedersen
D. Slagstad
T. Semenova
A. Timonin
Department of Aquatic BioSciences, Norwegian College of Fishery Science, University of Tromsø, 9037 Tromsø, Norway
SINTEF Fisheries and Aquaculture, 7465 Trondheim, Norway
P. P. Shirsov Institute of Oceanology, Russian Academy of Science, Krasikova St. 23, Moscow, 117 218, Russia
During winter 2003 and 2004, zooplankton and hydrographic data were
collected in the northern parts of the Norwegian Sea
(68–72° N, 8–17° E) west of the Norwegian shelf break at
depths down to 1800 m. The results cover both inter and intra annual
changes of hydrography and distribution of <i>Calanus</i> spp. For the
whole survey area,
average seawater temperature down to 1000 m was higher in 2004 than
in the same period in 2003. For the upper 500 m the difference was
ca. 1°C. <i>Calanus finmarchicus</i> dominated at ca. 75% of
the total
copepod abundance. Typical abundance of <i>C. finmarchicus</i> in the
survey area was 30 000–40 000 m<sup>−2</sup>.
<i>C. hyperboreus</i> was found deeper
than <i>C. finmarchicus</i> while other copepods were found at the depth
of <i>C. finmarchicus</i> or shallower. From January to February 2004,
the peak of abundance of <i>C. finmarchicus</i> and
<i>C. hyperboreus</i> shifted approximately 300 m upwards indicating that
ascent from overwintering depth took place at a speed of 10 m d<sup>−1</sup>
during this period. In
general, high abundance of copepods was found adjacent to the shelf
slope while oceanic areas had low and intermediate abundance. In the
southern part of the survey area, location of high and low copepod
abundance shifted both between and within years. In the northern part of
the survey area where the shelf slope is less steep, copepods
was present at intermediate and high abundance during all surveys.
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