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Hydroclimatic modulation of diatom/Phaeocystis blooms in nutrient-enriched Belgian coastal waters (North Sea)
Breton, E.; Rousseau, V.; Parent, J.-Y.; Ozer, J.; Lancelot, C. (2006). Hydroclimatic modulation of diatom/Phaeocystis blooms in nutrient-enriched Belgian coastal waters (North Sea). Limnol. Oceanogr. 51(3): 1401-1409. dx.doi.org/10.4319/lo.2006.51.3.1401
In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc. ISSN 0024-3590; e-ISSN 1939-5590, meer
Peer reviewed article  
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Trefwoorden
    Algae > Diatoms
    Algal blooms
    AN, North Atlantic
    ANE, North Sea, Southern Bight
    Aquatic communities > Plankton > Phytoplankton
    Belgium, Schelde R.
    Coastal zone
    Nitrate cycle
    Water bodies > Coastal waters
    Bacillariophyceae [WoRMS]; Phaeocystis Lagerheim, 1893 [WoRMS]
    Belgische kust [Marine Regions]; North Atlantic Ocean [Marine Regions]; Schelde R. [Marine Regions]; Zuidelijke Bocht [Marine Regions]
    Marien/Kust
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Abstract
    Statistical analysis of 14 yr (1988-2001) of intensive phytoplankton monitoring at Station 330 in the central Belgian Coastal Zone (BCZ, Southern Bight of the North Sea) indicates that the long-term diatom biomass trend and the spring dominance of Phaeocystis colonies over diatoms are determined by the combined effect of the North Atlantic Oscillation (NAO) and freshwater and continental nitrate carried by the Scheldt. The strong correlation between diatoms and the NAO index is largely explained by the modulating effect of the latter on the water budget at the monitoring station. The relationship between Phaeocystis spring blooms and winter NAO (NAOw) is indirect, better expressed by springtime Phaeocystis dominance over diatoms because of the higher response of the latter to the NAO. The spring Phaeocystis : diatom bloom ratio is negatively (or positively) linked to positive (or negative) NAOw values. A complex cascade of events links large-scale NAO index variations with those local meteorological conditions (wind strength and direction, rainfall) that drive the hydrography and water budget of the BCZ. Local meteorological conditions in turn modulate the geographical spread of Scheldt nutrient loads in the coastal zone and ultimately regulate the magnitude of Phaeocystis spring blooms by determining winter nitrate enrichment. Hence, the absence of a linear relationship between Phaeocystis spring blooms and NAOw is explained by the nonlinear response of river-based nitrate pulses to NAO due to local wind-driven hydrodynamical forcing.
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