Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 68, Issue 10, Pages 2029-2043Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsr149
Keywords
diatoms; eastern English Channel; eutrophication; long-term series; Phaeocystis globosa; Southern Bight of the North Sea
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Funding
- Agence de l'Eau Artois Picardie (Regional Water Agency)
- French Ministry in charge of the Environment
- European Research Funds (ERDF)
- Nord Pas-de-Calais Region (CPER Bloom of Phaeocystis Regional programme)
- National Programme for Coastal Environment
- Nord Pas-de-Calais Regional
- Agence de l'Eau Artois Picardie [5306500]
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The spatial and main temporal variations in nutrient concentrations and phytoplankton abundance were investigated between 1992 and 2007 in the eastern English Channel and the Southern Bight of the North Sea, zones of consistent presence of Phaeocystis globosa and diatom blooms. Silicate and phosphate were the main nutrients potentially limiting phytoplankton growth, but the dynamics of the limitation seemingly differ between sites. Phosphate concentration showed a clear monotonic decreasing trend, whereas dissolved inorganic nitrogen and silicate trends were more complex. Nitrate was rarely or never a limiting factor. Results highlight three main periods with a Phaeocystis- or diatom-dominated system in the 1990s, and a more complex pattern in the 2000s. The composition of the phytoplanktonic community is described and an attempt made to establish a link between the community and its environment in terms of variability, shifts, and trends. The effects of larger-vs. regional-scale controlling factors are also discussed.
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