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Location Uzbekistan, Jizzakh
Central coordinates 67o 49.52' East  40o 50.93' North
IBA criteria A1, A4i
Area 31,706 ha
Altitude 246 - 268m
Year of IBA assessment 2006

Uzbekistan Society for the Protection of Birds (Affiliate)

Site description This site is situated 45 km to the SW of the district center Gagarin. It includes Arnasay water reservoir, adjusting lakes and part of the sandy desert. The length of the reservoir is about 70 km, width up to 7-12 km, average depth 5-7 m., and has a gently sloping shore. The shoreline is indented by long shore bays sometimes with thin strips of reed. The isolated lakes are surrounded by tugay forest and have extensive cover of reeds (up to 60-70%). The lakes tend to freeze (December/January to March) but not every year.

Key Biodiversity Currently no comprehensive data on the ornithofauna of this area exists. The list of birds of the adjacent territory includes about 230 species. Surveys carried out in spring 1998, summer 2004 and summer-autumn 2006 recorded 80 species. Of these, four are included on the IUCN Red List (Pelecanus crispus, Aythya nyroca, Aegypius monachus and Coracias garrulus) and 10 species are included on the national Red Data Book, namely, Pelecanus onocrotalus, Pelecanus crispus, Phalacrocorax рygmaeus, Plegadis falcinellus, Platalea leucorodia, Cygnus olor, Aythya nyroca, Aquila nipalensis, Aquila chrysaetos and Haliaeetus albicilla. A flock of Otis tarda (five individuals) was recorded by inspectors of the Aidar-Arnasai Basin Inspectorate in this area in 2004. Hunters noted that Branta ruficollis and Anser erythropus were among the species shot in a number of years.

Non-bird biodiversity: Animals are represented by typical species of the desert and waterside: gerbils, Long-clawed Ground Squirrel, jebroas, Fox (ssp. caragana), Corsac Fox, Steppe Cat, Wild Boar and Badger. An increase in the numbers of jackal and introduced muskrat has been noted in the last few years. Desert Monitor and Steppe tortoises, Phrynocephalus interscapularis and other lizards are common. Dice Snake, Marsh Frog and Green Toad are also recorded. Water bodies are inhabited by sazan, Pike-perch, Catfish, Roach, introduced Channa argus and Silver Carp. The coasts and islets of Arnasay reservoir and adjoining lakes are covered with desert species such as Haloxylon persicum, Populus ariana, P. proinosa, Alhagi psendalhagi, Ammodendron argentum, Astragalus amarus and Ferula caspica, and tree-shrub plants and grasses. Phragmites communis and Typha angustifolia grow along the shoreline; Potomogeton lucens, P. pectinatus, Myriophyllum spicatum, Ceratophyllum demersum etc. grow in the water.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Ferruginous Duck Aythya nyroca breeding  1998-2006  3-43 adults only  medium  A1  Near Threatened 
Common Crane Grus grus passage  2004-2006  100-816 adults only  good  A4i  Least Concern 

IBA Monitoring

2006 very high not assessed negligible
Good - based on reliable and complete / representative data

Agriculture and aquaculture livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming happening now some of area/population (10-49%) slow but significant deterioration medium
Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Biological resource use hunting & collecting terrestrial animals - unintentional effects (species is not the target) happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Natural system modifications dams & water management/use - dams (size unknown) happening now whole area/population (>90%) very rapid to severe deterioration very high

Not assessed  No management planning has taken place  Not assessed  negligible 


IUCN habitat Habitat detail Extent (% of site)
Shrubland   11%
Desert   9%
Wetlands (inland)   80%

Land use

Land-use Extent (% of site)
agriculture 20%
Notes: The lands situated in the direct proximity to the water body are used only as pastures for cattle. The entire year this water body is used as the drinking pond for small cattle
fisheries/aquaculture 80%
Notes: It is also used for fisheries.
hunting 5%
Notes: In autumn-winter it is used as the range for hunting
water management 100%
Notes: The lakes, as well as the reservoir, are heavily affected due to the withdrawal of water resources for agriculture

References Atadjanov, A., Filatov, A., Lanovenko, Y., Zagrebin, S., Chernogaev, E., Khodjaev, J. Aerial Survey of Wetlands in Uzbekistan (winter 2000). Report of the project RSGF "Protection of Uzbekistan's Wetlands and their Waterfowl". Part 3. Tashkent, June 2001. IWC National Data Base (2003-2005) Wetland International IWC Data Base (2003-2004)

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Aranasay Lake System. Downloaded from on 26/10/2016

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