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Anzali Lagoon

Coordinates: 37°28′16″N 49°27′44″E / 37.47111°N 49.46222°E / 37.47111; 49.46222
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37°28′16″N 49°27′44″E / 37.47111°N 49.46222°E / 37.47111; 49.46222

Designations
Official nameAnzali Wetland Complex
Designated23 June 1975
Reference no.40[1]
Anzali Lagoon

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

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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) 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

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Anzali Lagoon showing growth of Caspian lotus (Nelumbo caspicum) and mats of Azolla filiculoides fern.

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

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See also: Geography of Iran and Environmental issues in Iran

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

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Among the islands located in the lagoon are Bozorg, Kouchak, and Mianposhteh.[13]

Climatic conditions

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Anzali lagoon generally has hot and humid summers and mild winters.[14] The atmospheric characteristics of Anzali lagoon are similar to Anzali and Ghazian, but the amount of humidity in the lagoon is higher than the neighboring areas. The minimum temperature in winter is close to or equal to zero degrees Celsius and rarely falls below zero. The maximum temperature in the middle of summer is between 33 and 36 degrees Celsius.[15]

Ecology

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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.[16]

Biodiversity

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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.[16]

Plants

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The plants of this wetland are divided into three categories: submerged plants, floating plants and marginal plants.

marginal plants
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In this type of plants, all or most of the vegetative and reproductive organs of the plant are located outside the water. Most of the plants forming this layer grow on the edge of the marsh and nearby rivers. The following plants can be seen in this layer: Phragmites australis ,Sparganium ,Typha latifolia, Sirpus Polygonum ,Blue oregano Blue slingshot ,Blue heron Bottoms ,Nelombo ,horse tail[17]

Floating plants

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The plants of this layer are floating on the surface of the water, that is, the main parts of the plant, especially the leaves, are floating on the surface of the water, and the reproductive parts or The face is floating or out of water. Special organs like spongy tissues facilitate the plant's buoyancy. Special organs like spongy tissues facilitate the plant's buoyancy. Most of the plants of the floating layer and vegetation of the marsh and the nearby river can be named as follows: Otricularia. Shalvin. Hydrocharis.Spirodela polyrhiza . Salvia staminea. Despirodela.[17][18]

catchment area

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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.[19] 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.

• 9.53%: forest and pasture

• 2.33%: Agricultural lands

• 7.8%: wetlands, dams and pools

• 7.3%: areas used privately by people.[20]

Tributaries

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The following rivers and streams flow into the Anzali Lagoon.[21]

  • Pirbazar
  • Pasikhan
  • Shakhraz
  • Gazrudbar
  • Massuleh
  • Palanghvar
  • Abatar
  • Khalkai
  • Morghak
  • Bahambar
  • Shaf

References

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  1. ^ "Anzali Wetland Complex". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. ^ 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
  3. ^ a b "IR016: Anzali Mordab complex" Birdand International, accessed 29 November 2008
  4. ^ 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.
  5. ^ 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
  6. ^ 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
  7. ^ Ramsar sites database
  8. ^ 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
  9. ^ 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
  10. ^ "با تالاب زیبای انزلی آشنا شویم". www.beytoote.com. Retrieved 2024-10-19.
  11. ^ "Anzali Lagoon (Bandar-e Anzali) | Rasht Nature | TAP Persia". 2023-06-08. Retrieved 2024-10-19.
  12. ^ "Anzali Lagoon". Pars Diplomatic (in Persian). 2024-01-07. Retrieved 2024-10-19.
  13. ^ "About Guilan Province: Anzali Wetland" Guilan Province Water and Wastewater Company Archived January 6, 2009, at the Wayback Machine, accessed 28 November 2008
  14. ^ "تالاب انزلی". web.archive.org. 2017-05-18. Retrieved 2024-11-10.
  15. ^ گفته: ۰۳:۵۴ - ۱۳۹۴/۰۸/۱۹, تورج (2011-06-24). "تالاب انزلی گنجینه ای رو به نابودی | روستای کرکان بندرانزلی". روستای کرکان بندرانزلی | روستای کرکان در منطقه جلگه ای و در کنار جاده کپورچال-آبکنار واقع شده دارای نسق 85 ساله (تاتاریخ 1363 شمسی)بوده و از نظر ثبتی جزء بخش 7 حومه انزلی و سنگ شماره 6 میباشد و مسافتش تا کپورچال 7 کیلومتر و تا انزلی 27 کیلومتر است . . . Retrieved 2024-11-10.{{cite web}}: CS1 maint: numeric names: authors list (link)
  16. ^ a b mana.ir. "اوج رویش نیلوفرهای آبی در تالاب بین المللی انزلی". fa (in Persian). Retrieved 2024-11-02.
  17. ^ a b "تالاب انزلی (بندر اصلی) کجاست؟ آدرس، تصاویر، شرایط و هزینه های بازدید | بزن بریم سفر". letsgotrip.ir (in Persian). 2023-09-26. Retrieved 2024-11-29.
  18. ^ "ANZALI WATERSHED" (PDF).
  19. ^ "تالاب انزلی". ویلاتون (in Persian). Retrieved 2024-10-25.
  20. ^ اسدی, زینب (2019-09-08). "تالاب انزلی بزرگترین زیستگاه‌ طبیعی جانواران وگیاهان". بازدید ایده (in Persian). Retrieved 2024-10-25.
  21. ^ 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
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