Decreased influx of Calanus spp. into the south-western Norwegian Sea since 2003

The copepods Calanus hyperboreus and C. finmarchicus are the ecologically most important copepod species in the Nordic Seas. The larger C. hyperboreus, of polar origin, is advected into the south-western Norwegian Sea with the East Icelandic Current (EIC), and can therefore be considered an indicato...

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Published in:Deep-sea research. Part I, Oceanographic research papers Oceanographic research papers, 2019-07, Vol.149, p.103048, Article 103048
Main Authors: Kristiansen, Inga, Hátún, Hjálmar, Petursdottir, Hildur, Gislason, Astthor, Broms, Cecilie, Melle, Webjørn, Jacobsen, Jan A., Eliasen, Sólvá K., Gaard, Eilif
Format: Article
Language:English
Subjects:
Advection
Calanus finmarchicus
Calanus hyperboreus
East Icelandic current
Modified east Icelandic water
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Summary:The copepods Calanus hyperboreus and C. finmarchicus are the ecologically most important copepod species in the Nordic Seas. The larger C. hyperboreus, of polar origin, is advected into the south-western Norwegian Sea with the East Icelandic Current (EIC), and can therefore be considered an indicator species of these waters. Using large spatio-temporal hydrographic and zooplankton data sets, we show that an abrupt reduction in abundance of C. hyperboreus around the year 2003 in the south-western Norwegian Sea coincided with a reduction in the volume of Modified East Icelandic Water (MEIW) in the intermediate layers (R = 0.64, lagged one year). Abundance of C. hyperboreus and the volume of MEIW have since remained lower compared to the previous years (Mann-Whitney U tests, p 
ISSN:0967-0637
1879-0119
DOI:10.1016/j.dsr.2019.05.008