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Seasonal changes in particulate size spectra, biochemical con~position, fatty acid and sterol content were followed from winter to fall in a small north Atlantic coastal basin. Strong seasonality, related to both spnng-bloom and summer biological production, was recorded for most chemical and biochemical descriptors. Size spectra were generally characterized by donunance of small particles in the size range 6.35-25.4 pm equivalent diameter, except in early summer when an additional component in the 32.0-64.0 pm size range became important. Changes in either C:N ratio or carbohydrate:protein ratio indicated physiological changes which could be related to nutrient limitation or senescence The fatty a c ~ d and sterol composition of the lipid fraction displayed major seasonal changes which reflected: (1) the seasonal heterogeneity of the taxonomic composition of the particles; (2) the physiological changes w t h i n each group of organism; and (3) the various penods of low production or bloom decay. Spring bloom production of small to medium size particles (12.7-50.8 pm) was associated with C16 polyunsaturated acid, 20:5w3, 24 methylene-cholesterol and desmosterol. Summer production of small particles (2.0-6.4 pm) was associated w t h C18 polyunsaturated acids, 2 2 : 6 ~ 3 , nor-24-cholesterol and isofucosterol, while the late winter-early spring period displayed close relationships between some saturates as well as monoenes (18.0, 18-lw9, 20:lw9, 2 2 . 1 ~ 9 ) and cholesterol Post-bloom decay associated another group of saturates and monoenes (14.0, 20:0, 22:0, 16 lw9, 16:ltA3) and p-sitosterol. Overall particulate biochemical dynamics is discussed in terms of both phytoplankton metabolism and trophic influence for the zooplankton consumers.

Seasonal changes of the biochemical composition of marine particulate matter with special reference to fatty acids and sterols