Anzali Lagoon
37°28′16″N 49°27′44″E / 37.47111°N 49.46222°E
| Designations | |
|---|---|
| Official name | Anzali Wetland Complex |
| Designated | 23 June 1975 |
| Reference no. | 40[1] |
Anzali Lagoon (Gilaki: اٚنزٚلي سٚل Persian: تالاب انزلی) (also Anzali Mordab, Anzali Bay, Pahlavi Mordab, Pahlavi Bay or Anzali Liman)[2] is a coastal liman, or lagoon, in the Caspian Sea near Bandar-e Anzali, in the northern Iranian province of Gilan. The lagoon divides Bandar-e Anzali into two parts, and is home to both the Selke Wildlife Refuge and the Siahkesheem Marsh.[3]
History
[edit]Although the lagoon suffers from pollution,[4] it is known as a good place for bird watching.[3] The lagoon's water ranges from fresh near the tributary streams to brackish near the mouth into the harbor and the sea. Studies indicate that in the 19th and early 20th centuries that the lagoon had a much higher salinity.[5]
The lagoon has decreased in size since the 1930s to less than a quarter of its former extent.[5] However, in the last ten years (As of 2007[update]) water salinity has increased both by the rise of the level of the Caspian Sea which has caused greater interchange of waters, and due to greater salt transport in incoming "fresh" water due to increased upstream irrigation.[5][6]
The lagoon has been listed in Ramsar Convention since 21 December 1975.[7]
Fishery
[edit]
Prior to 1950 the Anzali Lagoon provided about 70% of the commercial fish taken in Gilan Province, with catches of over 5,000 tons annually.[2] Commercial fishing was done during the spring and autumn spawning cycles when the kutum, pike-perch and bream, would enter the lagoon from the Caspian.[2] However, a number of factors acted against the continuation of the fishery and by the time commercial fishing ceased in 1960 annual catches were less than 100 tons.[2]
Heavy siltation from increased upstream irrigation had resulted in the shrinkage and shallowing of the lagoon, increased pollution of the source waters and eutrophication due to an increased nutrient load contributed to the destruction of the fishery. More recently the surface of the lagoon has become gradually overgrown with aquatic macrophytes, primarily the non-native water-fern, Azolla filiculoides, and this has caused increased eutrophication, creating large areas of the lagoon where there is insufficient dissolved oxygen for fish to survive.[8][9]
Geography
[edit]Located in an area of 15,000 hectares near the northern port city of Bandar Anzali in Gilan Province. Its geographical coordinates are located at 28 to 37 north latitude and 25 to 49 east longitude.[10] Due to its geographical location, Anzali wetland is distinguished among other wetlands in Iran in terms of excessive humidity and rainfall. Although this subject fluctuates depending on the amount of rainfall and the duration of the drought.[11]
Anzali is one of the few Iranian wetlands which have been registered as an international wetland in the 1975 Ramsar Convention.[12] Wetlands are considered the most biologically diverse of all ecosystems; however, the Anzali Wetland has also been the victim of the authorities neglect, putting it in danger of grave ecological changes.[citation needed]
The use of Anzali Wetland's bank as the city dump and the release of human and industrial waste into the wetland have already put in danger the lives of animal species and at least 78 species of birds living in the area. Besides, some local authorities plan to build a sports field in a peninsula connected to the wetland. This will be the final blow to the wetland, which has so far been prevented only by the serious opposition of environmentalists to the construction of the sports field.[citation needed]
Islands
[edit]Among the islands located in the lagoon are Bozorg, Kouchak, and Mianposhteh.[13]
Ecology
[edit]This wetland has a special environment due to the presence of animals and plants, the morphology, shape of the stream bed, the connection with the rivers and the sea.[14]
Biodiversity
[edit]Anzali Wetland is a spawning place for aquatic animals and a habitat for native and migratory birds. This wetland has a unique ecosystem with hundreds of plant species, 50 fish species, and more than 100 bird species. Anzali lagoon is also one of the most important sources of reproduction and production of sturgeon and bony fish in the Caspian Sea.[14]
catchment area
[edit]The lagoon has an area of about 374 thousand hectares. Anzali Wetland has 11 main rivers and 30 sub-rivers which, after irrigating the fields and paddy fields upstream, enter it along with the surface flows of the watershed of the Wetland.[15] The maximum water depth of the lagoon in spring and in the western areas of the lagoon reaches 2.5 meters, which varies due to the fluctuations of the water level of the Caspian Sea. The catchment area of Anzali lagoon is as follows:
• 9.53%: forest and pasture
• 2.33%: Agricultural lands
• 7.8%: wetlands, dams and pools
• 7.3%: areas used privately by people.[16]
Tributaries
[edit]The following rivers and streams flow into the Anzali Lagoon.[17]
- Pirbazar
- Pasikhan
- Shakhraz
- Gazrudbar
- Massuleh
- Palanghvar
- Abatar
- Khalkai
- Morghak
- Bahambar
- Shaf
References
[edit]- ^ "Anzali Wetland Complex". Ramsar Sites Information Service. Retrieved 25 April 2018.
- ^ a b c d Holčik, Juraj and Oláh, János (1992) "Introduction" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ a b "IR016: Anzali Mordab complex" Birdand International, accessed 29 November 2008
- ^ Pourang, N. (1996) "Heavy metal concentrations in surficial sediments and benthic macroinvertebrates from Anzali wetland, Iran" Hydrobiologia 331(1/3): pp. 53–61, p.53, et.seq.
- ^ a b c Holčik, Juraj and Oláh, János (1992) "2.3 Status of the Anzali Lagoon" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ Final Report of the 5th Meeting on Anzali Lagoon Adaptive Management Pilot Initiation Project (17 April 2007), Caspian Environment Program (CEP), p. 4[dead link], accessed 28 November 2008
- ^ Ramsar sites database
- ^ Holčik, Juraj and Oláh, János (1992) "2.3.3 Azolla invasion" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ Jamalzad, F.; Nezami, Sh. and Sefat, A. Darvish (2004) "Investigation of trophic states in the Anzali Lagoon using GIS" Intecol 7th International Wetlands Conference, Utrecht, Netherlands
- ^ "با تالاب زیبای انزلی آشنا شویم". www.beytoote.com. Retrieved 2024-10-19.
- ^ "Anzali Lagoon (Bandar-e Anzali) | Rasht Nature | TAP Persia". 2023-06-08. Retrieved 2024-10-19.
- ^ "Anzali Lagoon". Pars Diplomatic (in Persian). 2024-01-07. Retrieved 2024-10-19.
- ^ "About Guilan Province: Anzali Wetland" Guilan Province Water and Wastewater Company Archived January 6, 2009, at the Wayback Machine, accessed 28 November 2008
- ^ a b mana.ir. "اوج رویش نیلوفرهای آبی در تالاب بین المللی انزلی". fa (in Persian). Retrieved 2024-11-02.
- ^ "تالاب انزلی". ویلاتون (in Persian). Retrieved 2024-10-25.
- ^ اسدی, زینب (2019-09-08). "تالاب انزلی بزرگترین زیستگاه طبیعی جانواران وگیاهان". بازدید ایده (in Persian). Retrieved 2024-10-25.
- ^ Holčik, Juraj and Oláh, János (1992) "Table 4: A suspended sediment transport to Anzali Lagoon in 1990–91" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
External links
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