Introduction : this paper aims to investigate the fluctuations of the physical characteristics of water in the seasons of the flood period on phytoplankton production and its relationship with physicochemical factors and contributing nutrients in Shadgan Wetland. In this paper, flood maps are produced using the proposed algorithm.
Materials and methods: Based on the ecological conditions of the region and issues related to the changes caused by floods in the region, sampling steps in 3 different conditions; It includes the flood season, which means a short time after the flood in Khuzestan province, the wet season, which includes the autumn and winter months with less rainfall than during the flood, and the dry season, which means the time when the flood has subsided completely and all its effects have disappeared which includes the summer months.
Results: In the results of one-way variance analysis, there was a positive and significant relationship between the amount of chlorophyll a and other nutrients (phosphate, nitrate and carbon) (P<0.05). The increase in the amount of nutrients at the time of flood caused an increase in primary production by phytoplankton due to the increase in the amount of chlorophyll a. The highest amount of phosphate was 1.3 mg/liter during flood at Shadgan Lagoon station and the lowest amount was 0.1 mg during dry season at Khor Mard station. Also, the highest surface temperature was in August, which had no significant relationship with the amount of chlorophyll a in the region (P>0.05).
Conclusion: The results show that the increase in nutrients due to flooding caused an increase in the primary production of phytoplankton in the lagoon, which showed the high amount of chlorophyll a in the lower parts of the lagoon.