Abstract
A cruise on board the R/V Italica was carried out in the Ross Sea during the austral spring 1994 to investigate the ecological mechanisms that characterize the marginal ice zone (MIZ) of the Ross Sea polynya. In this framework, size-fractionated primary production was studied to assess its spatial and temporal evolution in relation to irradiance, structure of the water column and processes of removal by consumers. Integrated total daily production levels were very variable, ranging from 131 to 2992 mg Cm-2 day-1. Highest values were measured in the polynya and in the MIZ, in situations where ice melting could not ensure water column stability.
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