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JPR Advance Access originally published online on September 21, 2006
Journal of Plankton Research 2006 28(12):1181-1190; doi:10.1093/plankt/fbl048
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Spatial patterns of surface blooms and recruitment dynamics of Calanus finmarchicus in the NE Norwegian Sea

Sünnje L. Basedow*, Are Edvardsen and Kurt S. Tande

Norwegian College of Fishery Science, University of Tromsø, 9037 Tromsø, Norway

* Corresponding Author: sunnje.basedow{at}nfh.uit.no

Received on July 5, 2006; revised on August 8, 2006; accepted on September 18, 2006

Communicating editor: R.P. Harris


  Abstract

Spatial dynamics of phytoplankton blooms and Calanus finmarchicus were analysed in a large-scale oceanic area (10274 km) in the NE Norwegian Sea (69–71°N, 12–16°E). Data on hydrography, chlorophyll a (Chl a) and mesozooplankton (net samples and Optical Plankton Counter) were collected in surface waters (0–30 m) during spring and early summer 2003. Spatial patterns of copepodites in relation to hydrography and Chl a concentration were analysed by constrained correspondence analysis. Distribution of phytoplankton and C. finmarchicus was highly patchy. The overwintering generation (CV and adult females) had highest abundances in areas with phytoplankton blooms, whereas the recruiting cohort (CII + CIII copepodites) was found in water parcels with low Chl a concentration. Differences in recruitment dynamics between the southern and northern Norwegian Sea are discussed. Our data confirm the importance of phytoplankton spring blooms in initiating the recruitment of C. finmarchicus. This opens up for a future mapping of sea surface chlorophyll to depict the large-scale variability in the demography of C. finmarchicus during the reproductive season in the Norwegian Sea.


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