Assessing Accumulated Total Mercury in Planktonic Biomass from Sanandaj Gheshlagh Reservoir
Subject Areas : environmental managementKamran Almasieh 1 , Shahram Kaboodvandpour 2
1 - Assistant Professor in Environmental Science, Department of Range and Watershed Management, Natural Resources Faculty, Ramin Agriculture and Natural Resources University of Khuzestan, Mollasani, Iran.
2 - Assistant Professor in Environmental Science, Department of Environmental Sciences, Natural Resources Faculty, University of Kurdistan, Sanandaj, Iran. * (Corresponding Author)
Keywords: Total Mercury, Plankton, Biomagnification, Sanandaj Gheshlagh Reservoir,
Abstract :
Background and Objective: Previous studies showed that the level of total mercury (T-Hg) in Sanandaj Gheshlagh Reservoir (SGR) water is higher than those limits established by WHO and institute of standard of Iran (i.e., 1 µg/L). Therefore this research was carried out to evaluate the level of T-Hg in SGR plankton biomass as the main source of food which is the most consumed fish in the region and to calculate the mercury biomagnification factor based on published results related to the SGR's silver carp. Method: Plankton samples were collected during July to December 2009 from three different sampling sites. The level of the T-Hg in plankton biomass was measured using Advanced Mercury Analyzer. Findings: Mean accumulated T-Hg (± S.E.) in plankton biomass of SGR was 78.21 ± 3.13 on ng g-1 dry weight basis that the highest level was observed in August (86.81 ± 10.9) and the lowest level was observed in September (68 ± 2.53) on ng g-1 dry weight basis. Statistical analysis showed that the amount of accumulated T-Hg was not significantly different between plankton biomass samples during different months (F5, 10 = 0.94, P = 0.49) and among different sites (F2, 10 = 1.19, P = 0.34). Conclusion: Based on previous studies results in related to the planktivorous fish of SGR and present study results, occurring of mercury biomagnification in the food chain of this water reservoir was proven and it seems that the planktonic biomass of fresh water ecosystem have a considerable capacity to transfer a significant amount of mercury to the higher trophic levels.
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