Experiments were carried out at two stations in the northern part of Latakian coastal
water during March 2010, to investigate the influence of Si: N ratios on diatoms growth
and to determine the conditions that would generate Si limitation in diato
m growth and that
might cause a shift from diatom to din flagellate dominance. To achieve that, Natural Phytoplankton
were cultured in mesocosm experiments. At the beginning of the experiment,
the inorganic nutrients were manipulated to give different inorganic Si: N ratios (ranged
between 0, 3 and 7). The results showed that Diatoms were still dominant under these Si: N
ratios and Din flagellates remained unaffected, regardless of the above different ratios. The
experiment did not show any Silicate limitation to the diatom growth even under the lowest
N: Si ratios. Moreover, the species composition of diatoms was affected by the enrichment
experiments operated in two stations. Here, the Nitzschia closterium species dominated
under both low and high Si: N ratios although their occurrence is not common during
the spring phytoplankton bloom at both sites.