This study was carried out during the period 2011–2010 for 12 months. 110 species
of phytoplankton in Al-Kabir Al-Shamali River were identified including 4 species of
Euglenophyta, 15 species of Cyanophyta, 49 species of Chrysophyta, 40 species of
Chlorophyta and 2 species of Pyrrophyta.
Some physicochemical parameters of water were determined. Some of them were the
temperature which ranged between 10.8–28°C, the pH 7.76–8.2 and the BOD 1.6–10mg/l,
while the concentrations of NO3
- ranged between 1.10-250 mg/l, nitrate 0.13-0.01mg/l, and
PO4
- ions 0.015–1.05 mg/l. The highest value of ammonium ions was 6.25mg/l and the
lowest was 0.011 mg/l. BOD concentrations ranged between 6.06-12.07mg/l.
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.
This research aims at studying the most important indicators of water pollution leading to
nutrient increase (eutrophication) in AL- Basel Dam Lake, and connecting them with
pollution sources represented by untreated sewage water and agricultural d
rainage water,
including rain water coming from the lands surrounding the lake. Among the most
important of these indicators are total phosphorus (TP) and total Nitrogen (TN). Samples
were taken and analyzed from four sitesof the lake (S1, S2, S3, S4) were conducted
periodically. The work continued to conduct tests for full hydrological cycle as of January
(2016) until December (2016). The study showed that the lake was highly fertilized
according to the (TN- TP) this indicates that the lake is affected by the pollutants it
encounters, especially the wastewater pollutants. The specific component of algal growth
was determined by knowing the ratio between total nitrogen and total phosphorus. The TN
/ TP ratio was greater than 10, so total phosphorus is the specific component of algal
growth in the Basel DamLake.
