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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):39-49; doi:10.1006/jmsc.2000.0987
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Long-term and regional variability of phytoplankton biomass in the Northeast Atlantic (1960–1995)

Martin Edwardsa,b,, Philip Reida and Benjamin Planquec

a Sir Alister Hardy Foundation for Ocean Science, The Laboratory Citadel Hill, Plymouth, PL1 2PB, UK
b Department of Biological Sciences, University of Plymouth Drake Circus, Plymouth, PL4 8AA, UK
c CEFAS Fisheries Laboratory Pakefield Road, Lowestoft, Suffolk, NR33 0HT, UK

Correspondence to M. Edwards; Tel.: +44 (0) 1752 633130; fax: +44 (0) 1752 633102; e-mail: maed{at}wpo.nerc.ac.uk

Long-term regional changes in phytoplankton biomass in the Northeast Atlantic and North Sea are investigated using data from the Continuous Plankton Recorder survey. During the last decade there have been large changes in the long-term variation in phytoplankton biomass in the Northeast Atlantic and North Sea. Most regions, particularly in the North Sea, have shown a considerable increase in phytoplankton biomass while the opposite pattern was seen in the northern oceanic region of the Northeast Atlantic. These different spatial responses show similar patterns of change to the decadal variability in sea surface temperature influenced by the North Atlantic Oscillation index. Two rare oceanographic events and their relationship to the interannual changes in phytoplankton biomass are discussed. The results highlight the importance of maintaining long-term biological monitoring programmes to assess the biological responses to slow oceanic/atmospheric processes and to rare or episodic physical events.

Keywords: phytoplankton biomass, long-term trends, Continuous Plankton Recorder, NAO, Northeast Atlantic

Received 4 November 1999; accepted 21 June 2000.


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