ROLE OF INTERNAL WAVES ON MIXING, NUTRIENT SUPPLY AND PHYTOPLANKTON COMPOSITION DURING SPRING AND NEAP TIDES IN THE RÍA DE VIGO (NW IBERIAN PENINSULA)
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AuthorsVillamaña, M.; Mouriño-Carballido, B. (Beatriz); Cermeño, P.; Chouciño, P. (Paloma); Silva, J.; Fernández-Castro, B. (Bieito); Gilcoto, M. (Miguel); Graña, R. (Rocío); Latasa, M. (Mikel); Marañón, E.; Scharek, R. (Renate)
The effect of internal wave activity on nutrient supply to the euphotic layer and its potential impact on phytoplankton composition and size-structure remain unexplored in the shelf edge off NW Iberian Peninsula. In August 2013, continuous measurements (yo-yo) of dissipation rates of turbulent kinetic energy, obtained with a microstructure profiler, were carried out during spring and neap tides, covering a complete tidal cycle (25 hours). Every hour the yo-yo was interrupted to collect samples for inorganic nutrient concentration. Microturbulence and nutrient concentration data were combined to compute the nutrient input into the euphotic zone driven by vertical diffusivity. Size-fractionated chlorophyll-a and pigment composition samples were taken for the determination of phytoplankton community structure. As a result of increased mixing levels, nitrate transport to the euphotic layer during spring tides was approximately 4-fold higher (34.6 mmol m-2 d-1) than during neap tides (9.4 ...