The present work investigates phytoplankton growth dynamics as a function of several ecological and physiological parameters in an Antarctic shallow coastal environment: Potter Cove (King George Island, South Shetland Islands). Results are based on data on different temporal and spatial scales obtained during 6 field campaigns (both during the spring-summer season and year-round). High loadings of terrigenous particulated materials significantly influence light penetration in the water column, especially during the growth season, and strong winds (average >8 m s-1) characterize the area at all times of the year. Detailed quantification of these parameters (the first in its type for these environments) allowed estimates of the relationship between Sverdrup's critical depth (Z(c)) and the depth of vertical transport of particles due to wind-induced turbulent kinetic energy Z(t). Strongly inhibiting relationships between Z(c) and Z(t) (Z(c)/Z(t) < 1 ) were identified during most of the phytoplankton growth season. it is concluded that, during ice-free periods, poor light conditions and wind-induced water column instability are responsible for the low microalgal concentrations observed in potter cove.