Survey and determination of Anzali wetland trophic state through geographic information systems (GIS) |
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| Authors: | Abbas Akbarzadeh Hasan-Ali Laghai Masuod Monavari Shaban Ali Nezami Seyed Soheil Saeedi Saravi |
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| Institution: | 1. Department of Environmental Management, Science and Research Branch , Shaheed Beheshti University , Tehran, Iran;2. Urban Planning Department , Tehran University , Tehran, Iran;3. Department of Environmental Science, Science and Research Branch , Tehran, Iran;4. Iran Fisheries Organization , Tehran, Iran;5. Faculty of Pharmacy , Mazandaran University of Medical Sciences , Mazandaran Pharmaceutical Sciences Research Center, Sari, Iran |
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| Abstract: | The trophic state of the Anzali wetland was determined by nutrient analysis, indicating an alarming hypertrophic state. The Anzali wetland is environmentally and economically one of the most important ecosystems that is located in north-west Iran. This wetland was registered as a Ramsar site in September 1975, but due to many problems, particularly eutrophication created by excessive amounts of nutrients, it was registered in the Montreux record. This study was conducted for a year on 21 stations in three zones including receiving rivers, surface water and exiting rivers. Geographic information systems were used to better understand the prevailing situation. Analysis was conducted according to international standards and classification of OECD for freshwaters. The indicators used were levels of total nitrogen (TN) and total phosphorous (TP), and the trophic state index (TSI). Data showed an increase of excess nutrients from domestic and agricultural sources, leading to human, cultural eutrophication processes rather than natural eutrophication. |
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| Keywords: | eutrophication nutrient enrichment TP TN TSI |
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