Document Type : Animal environment
Authors
1
Department of Marine Biology, Faculty of Natural Resources , Tarbiat Moddares University, P.O.Box: 356-46414, Noor, Iran
2
Department of Environment, Faculty of Natural Resources , Tarbiat Moddares University, P.O.Box: 356-46414, Noor, Iran
3
National Inland Water Aquaculture Institute, P.O.Box:66, Bandar Anzali, Iran
4
Department of Environmental Education, Management and Planning , Faculty of Environment, University of Tehran, P.O.Box: 6135-14155, Tehran, Iran
5
Department of Environmental Planning, Payame Noor University, P.O.Box: 4697-19395, Tehran, Iran
Abstract
To compare physical, chemical and biological indices of primary productions on the coast of Bandar-e Anzali, water column in the depths of 2, 5 and 10 meters was sampled. The physical index of primary productions by using the Secchi disc Was calculated, chemical index by measuring the density of nutrients in water and biological index by determining the density of Chlorophyll a in phytoplankton’s were calculated. The maximum clearance was 300 centimeters in spring and the average maximum density of total Phosphorus and total Nitrogen in water column was in spring and respectively 0.061 and 0.831 milligram per Liter (p<0.05). The maximum density of Chlorophyll a was in summer, 6.4 microgram per cubic meter. The results show that among these indices, it is better to use physical and biological indices. Both indices statistically have reversed correlation (p<0.05). Through comparison of information with qualitative water class tables, water of Caspian Sea can be located in Mesotroph water class from the density of Chlorophyll a point of view according to the amount of summer vision depth by Secchi disc and at the beginning of Eutroph water class from the point of view of total Phosphorus and total Nitrogen (p<0.05).
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