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Renewal time and the impact of harmful algal blooms on the extensive mussel raft culture of the Iberian coastal upwelling system (SW Europe)

AuthorsÁlvarez-Salgado, Xosé Antón ; Labarta, Uxío ; Fernández-Reiriz, María José ; Figueiras, F. G. ; Rosón, Gabriel; Piedracoba, Silvia ; Filgueira, Ramón ; Cabanas, J. M.
KeywordsClimate change
Coastal upwelling
Flushing time
Harmful microalgae
Mussel raft
NW Spain
Issue Date4-May-2008
CitationHarmful Algae 7(6): 849-855 (2008)
AbstractThe extension and intensity of the upwelling season in the NW Iberian Peninsula (42°N–43°N) have decreased by 30 and 45% over the last 40 years, respectively. Accordingly, the renewal time (τ) of the Rías Baixas, four large coastal inlets where 15% of the World extraction of blue mussels occurs, has increased by 240%. We indirectly demonstrate here that the growing τ has caused the increasing occurrence of harmful microalgae in these embayments, dramatically affecting mussel raft cultivation. The equation D = 365(1 − exp(−τ/c1)) explains 80% of the variability of the number of days per year that mussels cannot be extracted from the hanging ropes because of the occurrence of harmful microalgae (D). The coefficient c1 = 37 ± 2 days indicates that an average τ over the upwelling season of >25 ± 1 or 50 ± 3 days reduce mussel extraction to only 50 or 25% of the year, respectively.
Description7 pages, 4 figures.-- Printed version published in Oct 2008.
Publisher version (URL)http://dx.doi.org/10.1016/j.hal.2008.04.007
Appears in Collections:(IIM) Artículos
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