Twenty-Five Years of Domoic Acid Monitoring in Galicia (NW Spain): Spatial, Temporal and Interspecific Variations.

A decreasing trend was also observed in DA presence in bivalves from England and Wales, from 1999 to 2009, even when the trend in the Pseudo-nitzschia populations was the reverse [ 52 ].

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maximus was excluded from the analysis (because it has a very high prevalence and it is collected mostly from only one estuary) DA prevalence showed an increasing trend from the southernmost estuaries towards Camariñas (CAM), and then a decreasing one up to Ribadeo (RIB), in the northeast extreme of the sampling area ( Figure 5 ).

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The timing of the DA episodes also showed a trend in the south–north direction.

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