Evaluation of heavy metals accumulation in the liver of great cormorants in the Southern Coast of Caspian Sea
Paper Details
Evaluation of heavy metals accumulation in the liver of great cormorants in the Southern Coast of Caspian Sea
Abstract
In order to study heavy metals pollution in the Caspian ecosystem this project has defined. The sampling for heavy metals analyses were done from the soils, water and so the liver of great cormorant in Persian and Russian Caspian basin randomly. Caspian Sea that is the largest lake in the world, located in the playa where drained water from the catchment areas of Northern Iran, East Azerbaijan, from North to South of Russia, West Kazakhstan and West Turkmenistan. The results showed a significant increasing of lead in sea water more than maximum permitted amounts with an increasing peak in summer. The copper amounts in sea water is low with a slightly growing in winter. Copper amounts in soil in coastal location in the province of Gilan in Iran was more than other coastal areas. From determinations of heavy metals in the cormorant liver were showed that the five years old birds which sampled in the Turkmen port on the southeast coast of the Caspian Sea, the amount of copper increased more than maximum levels. However, in the birds with two-years old and three years old copper contents was negligible. Maximum amounts of zinc were observed in floodplain soils near Volga delta. From comparison of heavy metals in river, flood plain and sea, were concluded the major sources of Pb, Cu and Zn in Caspian ecosystem are from Volga river in Russia and so partly from the rivers and port activities in the province of Gilan in Iran.
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