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Studies of diatom bloom formation and species succession in other shelf regions have demonstrated that diatoms dominate the phytoplankton community as long as silicate is present in concentrations greater than about 2?��M (Egge and Aksnes, 1992). Because the spring bloom on Georges Bank is composed primarily of diatoms, which take up nitrate and silicate in nearly equal proportions, and because source waters historically have had lower silicate concentrations relative to nitrate (Townsend et al., 2010), silicate ultimately becomes limiting first, curtailing the bloom as early as February when silicate concentrations are reduced to 2�C4?��M (Townsend and Thomas, 2001?and?Townsend and Thomas, 2002). The remaining concentrations [http://www.selleckchem.com/products/incb28060.html see more] of nitrate, however, play a key role in determining subsequent phytoplankton community composition, and force a post-bloom species succession to flagellates. For the remainder of the year, recycled nitrogen would appear to fuel primary production on the Bank which results in a phytoplankton community dominated by dinoflagellates and nanoflagellates. Of particular importance on the Bank are species of the toxic dinoflagellate Alexandrium spp. ( Cura, 1987, Kemper, 2000, McGillicuddy et al., 2014?and?Townsend et al., 2014). In this communication we add further insights into the late-spring to [http://www.selleckchem.com/products/iox1.html IOX1 mouse] summer phytoplankton community on Georges Bank, especially as related to distributions and abundances of the toxic dinoflagellate, Alexandrium spp. We present results of three post-spring-bloom oceanographic surveys of the Bank, between late April and early July of 2008, in which we analyzed the hydrography, nutrients and phytoplankton communities, and subjected those results to multivariate statistical analyses in order to discern spatial and temporal patterns among species assemblages as related to the physical oceanographic structure and nutrient fields across the Bank. We interpret those results in the context of earlier field studies ( Townsend et al., 2005) and laboratory experiments ( Gettings, 2010) that indicate the importance of interspecific competitive interactions in phytoplankton succession. Hydrographic surveys of temperature, [http://en.wikipedia.org/wiki/Oxygenase Oxygenase] salinity, nutrients, total and size-fractionated chlorophyll (>20?��m;