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Horizontal distribuhons of the particle size spectrum and chlorophyll a concentration in near-surface water in relahon to hydrographic structure were studied along a transect across the Skagerrak as part of the international SKAGEX-I exercise in May-June, 1990. Results are compared with those of IOsrboe et al. (Mar. Ecol. Prog Ser. 59: 19-32, 1990) who explained changes in the plankton size structure and the food web as resulting from differences in water column stratification. I t was confirmed that the parhcle size fraction corresponding to diatoms was most abundant along the Skagerrak penphery where stronger vertical mixing is assumed to take place. The smallest (1 to 4 pm), chlorophyll-correlated particulate fraction was most abundant in the central Skagerrak with the domelike near-surface stratification and the presumably reduced vertical minng . However, distributions along the transect changed considerably over 1 to 3 d due to advection In addition to the basin-wide changes, correlations of the different particle size fractions to chlorophyll concentration changed over much shorter length scales, often being in opposite phase to each other An equivalent spherical diameter of 4 pm was the size at which the most significant shift in the horizontal distribut~ons occurred. MARINE ECOLOGY PROGRESS SERIES Mar. Ecol. Prog. Ser. INTRODUCTION Published September 26

Size structure of planktonic particles in relation to hydrographic structure in the Skagerrak