Abstract
Based on the materials obtained in two fjords of West Spitsbergen Island, analysis of seasonal and spatial variability in the size distribution of Calanus sp. has been made. Statistically significant differences in the size structure of the fourth and fifth copepodite stages of the summer and late autumn period have been revealed. Populations of Grønfjorden and Billefjorden show spatial variability determined by local variations of the natural environmental factors. The discussed reasons of the observed seasonal variability are selective grazing of the largest specimens by predators of higher trophic levels, individual body size changes during accumulation or consumption of oil storage, as well as presence of two generations with different size parameters in the water column.
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