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15 pages, 6 figures, 7 tables.The Rías Baixas are reported to have the highest primary production along the NW coast of Spain due to the influence of upwelling, which occurs from April to October. Samples were taken over 2 wk periods at a single station in the Ría de Vigo during spring, summer and autumn 1993 to study the variation in the phytoplankton photosynthetic parameters (light limited slope, αB and light saturated chlorophyll specific rate, PmB) and daily primary production in relation to phytoplankton size class, species and hydrographic parameters. The range in primary production for the Ría was 65 to 3689 mg C m-2 d-1 for total phytoplankton, 65 to 2833 mg C m-2 d-1 for net phytoplankton and 0 to 1650 mg C m-2 d-1 for nanophytoplankton. The data suggest that most of the variation in primary production in the Ría during the upwelling season was due to nanophytoplankton. Upwelling/downwelling cycles in the Ría therefore give rise to a larger variation in energy transfer through the microbial loop than through the classic, short, food chain. This is caused mainly by increases in nanophytoplankton αB coupled with high NO3 due to upwelling events. The data also suggest that there are 3 principal factors that give high primary production in the Ría. Periodic relaxation and stratification events linked to water column heating during upwelling/downwelling cycles coincided with periods of high productivity. Size class also influences the primary production; net phytoplankton had significantly higher primary production during the upwelling season than the nanophytoplankton and was responsible for 66% of the mean primary production. Species differences affected the primary production in the Ría; highest values coincided with blooms of Chaetoceros spp. and the lowest with dinoflagellate blooms of Gymnodinium catenatum.This work was financed partly by\udthe Xunta de Galicia (project Xuga 40205 B 92) and by the\udComision Interministerial de Ciencia y Tecnologia (CICYT;\udproject AMB92-0165). B.A. was funded by a post graduate\udgrant from the Xunta de Galicia. E.G.F. was supported by the\udPlan de Formacion de Recursos Humanos of the Oriente University,\udVenezuela and G.H.T by the European Commission\udMAST programme (MAS3-CT96-5022).Peer reviewe

Significance of nanophytoplankton photosynthesis and primary production in a coastal upwelling system (Ría de Vigo, NW Spain)