期刊
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷 149, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2019.05.008
关键词
Calanus hyperboreus; Calanus finmarchicus; Advection; East Icelandic current; Modified east Icelandic water
类别
资金
- Danish government through the research program Changes in marine climatic and oceanographic conditions in the waters between the Faroes and Greenland, and their effects on plankton and fish
- Blue-Action project (European Union's Horizon 2020 research and innovation programme) [727852]
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 < 0.05). The total zooplankton biomass in spring within the EIC, east of Iceland, was also much reduced around 2003 and has also since remained low. A comparable post-2003 reduction is observed in the abundance of overwintered stages of C. finmarchicus in May. Our results suggest that the reduction of zooplankton in the south-western Norwegian Sea around 2003 was caused by reduced influence of subarctic waters from the western region. This may in turn impact the extensive feeding migration of herring to this region.
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