Investigation of the Density and Biodiversity of Phytoplankton in the Shahid Abbaspour Dam Lake

Shoukat, Parvaneh; Noedoost, Fariba

Volume 17, Issue 3 (Autumn 2025) 3 2025, 17(3): 1-26 | Back to browse issues page

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Shoukat P, Noedoost F. Investigation of the Density and Biodiversity of Phytoplankton in the Shahid Abbaspour Dam Lake. 3 2025; 17 (3) :1-26
URL: http://jmb.ahvaz.iau.ir/article-1-1048-en.html

Investigation of the Density and Biodiversity of Phytoplankton in the Shahid Abbaspour Dam Lake

Parvaneh Shoukat

, Fariba Noedoost

Department of Fisheries, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.

Abstract: (594 Views)

This study was conducted during two cold and temperate seasons at five stations in the Shahid Abbaspour Dam Lake from winter 2016 to spring 2017. Sampling at the stations was performed using a Nansen water sampler from the surface layer to a depth of 0.5 meters, with three replicates. Physical and chemical parameters including temperature, pH, salinity, dissolved oxygen, and electrical conductivity (EC), were measured using a Horiba U-10 instrument. Overall, 6 classes, 23 genera, and 7 species of phytoplanktonic organisms were identified. The highest percentages of abundance were related to the classes Dinophyceae (97%), Cyanophyceae (1%), Chrysophyceae (0.6%), and other groups (1.4%) of the total phytoplankton community. Within Dinophyceae, Peridinium sp. (79%) and Ceratium hirudinella (20.4%) represented the most abundant taxa. Within Cyanophyceae, the genera Gloeocapsa sp. (71%) and Oscillatoria sp. (22%) exhibited the highest abundance. According to the findings, dinoflagellates were present at all stations, with the greatest density occurring during winter. The highest and lowest Shannon diversity index values were recorded in spring and winter, respectively. Based on the Shannon index, the studied stations were evaluated as having poor water quality. One-way ANOVA, based on the mean abundance of phytoplankton and the Shannon, Simpson, Margalef, and Evenness biodiversity indices, revealed significant differences only between seasons (p< 0.05). The results of the PCA analysis indicate that dinoflagellates show the highest dependence on changes in salinity and electrical conductivity. Green algae and diatoms are more adapted to lower salinity conditions, moderate temperatures, and stable pH. Cyanobacteria grow under lower temperatures and reduced dissolved oxygen, indicating ecological responses that differ from those of other groups.The results indicated that Shahid Abbaspour Dam Lake, due to its use in agriculture and the presence of several fish species, is not rich in phytoplankton density and diversity compared with other reservoirs.

Keywords: Phytoplankton, biodiversity, Peridinium sp., Ceratium hirudinella, Shahid Abbaspour Dam Lake.

Full-Text [PDF 1264 kb] (352 Downloads)

Type of Study: Research | Subject: plankton
Received: 2025/07/18 | Accepted: 2025/10/15 | Published: 2025/10/15