Hydrology, hydrobiology and environmental pollution study of the southern of Caspian Sea basin (10-100 meter depth)
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AbstractThis study was conducted to study of Hydrology, Hydrobiology and Environmental pollution in the southern of the Caspian Sea. 33 stations were selected from Astara (in the west) to Hassan gholi (in the east). In each station, sampling carried out at suface, 10, 20, 50 and 100m depths. Sampling was performed during four seasons in 2004. Sampling stations also divided into three regions, including west (from Astara to Ramsar), middle (from Ramsar to Sari) and east (from Amirabad to Hassengholi). The results showed that maximum of water temperature was 24 ?C at summer in the eastern region while the minimum of water temperature in winter season has been 9.7 ?c in the western region. The average of dissolved oxygen concontration in spring , summer, autumn and winter season were 6.9 , 6.6, 8.2 and 6.7 mg/l , respectively. The maximum value of salinity was observed in spring (13.55 ppt) and minmum value in winter (8.24 ppt). The average of total nitrogen concentration were season was 711, 884, 583 and 669 µg/l in spring, summer, autumn and winter repectively. The average of total phosphorus concentration was 27.9, 37.1 and 42.6 µg/l in spring, summer, autumn and winter, respectively. The average of dissolved silica concentration has varied from 167 to 923.6 µg/l. The five phyla of phytoplankton have identified. The most species diversity was observed in winter (70 species) but the low species diversity has obtained in autumn. The most phytoplankton population was in spring and summer seasons. The cell abundance of phytoplankton in different seasons was fluctuated from 3914*103 to 17337*103 ind/m3. In addition, the phytoplankton biomas was varied 11.4 to 30.7 mg/l. Result showed that distribution of phytoplankton are varied at different areas, layer, seasons and stations. The average of cell abundance of zooplanktons was varied from 2023 to 12364 and/m3 at different seasons. The mean of bioman varied from 9.40 to 43.48 mg/l. In this study, 17 species and one class of macrobenthos were identified. The frequency of Annelida and Biovalvia was higher than all macrobenthos. The average of macrobenthos was 1218±851 ind/m2 and their biomass was 14±15 g/l. The average of PAHs concentration were 0.038, 0.028 and 0.21 mg/l in spring , summer and winter, respectively. The decending trend of heavy metal concentration were Fe>Mn>Zn>Cr>Pb>Co>Cd>Cu at different seasons in 2004. The maximum concentrations of organochlorine pesticides (OCPs) components in three regions of sampling zone such as , -BHC (middle), β,-BHC (middle), DDT (east) and dieldrin (east part) were 88.3, 35.0, 74.3 & 79.1 g/l during spring, summer, fall and winter, respectively.
Publisher or UniversityIranian Fisheries Science Research Institute
Series : Nr90.319;