Spring-neap tidal and circadian variability in the distribution of two groups of Pseudo-nitzschia species in an upwelling influenced estuary
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AuthorsDíaz, P.A. (Patricio Andrés); Reguera, B. (Beatriz); Ramilo-Rivero, M.I. (María Isabel); Ruiz-Villarreal, M. (Manuel); Velo-Suárez, L. (Lourdes); Gentien, P. (Patrick); Lunven, M. (Michel); Fernand, L. (Liam); Raine, R. (Robin)
Editor/sKim, H.G. (Hak Gyoon); Reguera-Ramírez, B. (Beatriz); Hallegraeff, G.M. (Gustaaf); Lee, C.K. (Chang Kyu); Han, M.S. (Myung Soo); Choi, J.K. (Joong Ki)
spring-neap tidal variability
High-resolution physical and biological measurements were carried out in the Ría de Pontevedra (NW Spain) in late spring during the ‘HABIT Pontevedra 2007’ survey, which utilized high vertical resolution instruments. Cell maxima of P. delicatissima (6 x 105 cells L-1) and P. seriata (2 x 106 cells L-1) groups were observed during the first half of the cruise during downwelling and a significant decrease in cell numbers occurred during subsequent upwelling conditions. The effect of tidal (both semidiurnal and spring-neap) and event driven (upwelling-downwelling cycle) variability were evident. The observed sequence of events suggests that Pseudo-nitzschia populations were advected from the shelf. The circadian variability was regulated by tidal forcing and Pseudo-nitzschia spp. maxima were observed at low tide. From results presented here we conclude that the magnitude of spring-neap tidal and circadian variability has to be considered when designing and implementing harmful algal bloom ...
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