Composition and interannual variability of phytoplankton in a coastal upwelling region (Lisbon Bay, Portugal)

Spatial and temporal variability in coccolithophore abundance and distribution in the NW Iberian coastal upwelling system

“…8). These results are in good agreement with previous works in the study area (Silva et al, 2008(Silva et al, , 2009Guerreiro et al, 2014), where C. leptoporus is regarded as a tracer of nutrientdepleted water masses of subtropical origin in the study area, suggesting a strong regional hydrographic control on its distribution. This paper reports on the assessment of the temporal and spatial variability and distribution of coccolithophore and coccolith abundances in the NW Iberian coastal upwelling system.…”

“…In spite of previous work (Guerreiro et al, 2015) suggesting that its imprint in the underlying sediments may be under-represented owing to selective dissolution of delicate coccoliths, several studies propose that this genus can dominate the water column assemblage in the study area in occasional periods -both close to the shore (Silva et al, 2008) and in open ocean conditions (Guerreiro et al, 2014). In this regard, S. pulchra along with Helicosphaera carteri, C. mediterranea, and R. clavigera constitute a minority but persistent late summer-autumn assemblage in the S and SW Iberian coast that has been proposed by previous authors Silva et al, 2008Silva et al, , 2009Moita et al, 2010) as a tracer for ENACW of subtropical origin (Fiúza, 1983). Apart from H. carteri, this assemblage was observed further offshore in November 2011 (Fig.…”

Coccolithophore variability from the Shackleton Site (IODP Site U1385) through MIS 16-10

“…The investigated area is located at the boundary between two coccolithophore biogeographic zones, the transitional and the subtropical zones (McIntyre and Bè, 1967). Abundance and distribution of coccolithophore in the area are related to the wind-driven upwelling productivity system (Moita, 1993;Abrantes and Moita, 1999;Silva et al, 2009). We present the first results on coccolithophore assemblage at Site U1385 which are interpreted in terms of past productivity and paleoclimate changes at glacial-interglacial and millennial time-scale.…”

Distribution, occurrence and biotoxin composition of the main shellfish toxin producing microalgae within European waters: A comparison of methods of analysis

“…Diatom (e.g. Pseudo-nitzschia) growth is favoured during high nutrient, turbulent conditions of spring-time upwelling periods (Silva et al, 2009). Whereas stratified conditions of summer and autumn downwelling favour a shift to the dinoflagellates (e.g.…”