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| Titel |
Distribution of overwintering Calanus in the North Norwegian Sea |
| VerfasserIn |
A. Edvardsen, J. M. Pedersen, D. Slagstad, T. Semenova, A. Timonin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 2, no. 2 ; Nr. 2, no. 2 (2006-07-25), S.87-96 |
| Datensatznummer |
250000506
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| Publikation (Nr.) |
 copernicus.org/os-2-87-2006.pdf |
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| Zusammenfassung |
| 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 Calanus 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. Calanus finmarchicus dominated at ca. 75% of
the total
copepod abundance. Typical abundance of C. finmarchicus in the
survey area was 30 000–40 000 m−2.
C. hyperboreus was found deeper
than C. finmarchicus while other copepods were found at the depth
of C. finmarchicus or shallower. From January to February 2004,
the peak of abundance of C. finmarchicus and
C. hyperboreus shifted approximately 300 m upwards indicating that
ascent from overwintering depth took place at a speed of 10 m d−1
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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