Distribution of Unionidae, Euglesidae, Pisidiidae and Corbiculidae Family Species in the Sangzor River Aquatic Ecosystems in Biotopes

Large Bivalvia do not live there because of the rapid flow of the Sangzor River in the narrow valley and the low water temperatures and low organic matter content. In the slopes of the middle stream of the Sangzor River, it is estimated that Sinanodonta orbicularis, S. puerorum and S. gibba species are 1-1.5 m2 in Gallaorol, Jizzakh and Pakhtakor districts. The first of these is the most numerous, with the total clams occurring in many parts of the river, where clay and macrophytes and reeds grow. Here they live at depths of 1-2 m and can sometimes be found in sandy areas (Table 1).

From these clusters all species of Chinese toothless were collected from the lower Sangzor River and the Jizzakh canal. They were first identified in 2019 for the Sangzor River qualification. Chinese complex fish play an important role in the occurrence and distribution of these tar on the Sangzor River. In the lower reaches of the river, the density of distribution decreases sharply compared to the middle part of the S. gibba species and occurs at 1.1-1 per 1 m2. This is due to river pollution. Anodonta (Colletopterum) cyrea subsp. sogdiana and A. piscinalis var. volgensis occur in the middle of the Sangzor River in the post - Jizzakh region at 1.2-1 per 1 m2, while A. piscinalis var. volgensis is 0.4 in the lower Pakhtakor district. The number and density of species is relatively low. The amount of water in the Sangar River and, accordingly, seasonal hydrological regime may be considered as one of the direct factors influencing the number of species of two- stage clams. Species of the Corbiculidae family Cyrena (Corbicula) cor, C. purpurea, C. fluminalis, C. (Corbicula) ferghanensis, and C. tibetensis are buried in sandy soils on 2-3 sq. m in waters in the Gallaorol and Pakhtakor districts.

The upper and middle streams of the Sangzor River are hot springs, which run from the ground under the influence of hydrostatic pressure. In the mountains there are more springs and springs than in the plain. Small bipedal clams were collected from the springs of the mountain part of the river. Seven species of mollusks of the Euglesa and Odhneripisidium genera were found in the Sangzor riverbanks and in the ditches from the springs (Table 1).

Summary

Our study identified 20 species of Bivalvia, 1 subspecies and 1 variety of the Sangzor River and its surrounding water species, belonging to 4 families and 5 genera. Of the species listed in the table: Euglesa hissarica, E. (Casertiana) obliquata, Odhneripisidium polytimeticum are more numerous. They occur at 1-4 m per 1 m2. The other species are relatively rare. Euglesa (Cyclocalyx) gurvichi, Odhneripisidium terekense, O. (Kuiperipisidium) issykkulense are the first to show from the Sangzor river basin. These bivalve mollusks are crenophils and pelolimnophils that live in springs and springs according to their habitat. The length of the Sangar River and the presence of all the biotopes in which the clams are inhabited have made the reservoir a favorable reservoir for the clams. However, it should be noted that although all species occur in the river, they differ in density. For example, although Sinanodonta is found in rivers, its density is lower than that of other ponds. The Sangar River is the most suitable reservoir for the reproduction and distribution of Corbicula species. Among the Bivalvia, the species is not very common in the lower Sangzor River, except for the Corbicula tibetensis species, which is found in both the middle and lower reaches of the river, and this species is widely adapted to the habitat and the variability of the hydrological regime of the river. Species endemic and rare species, and the subspecies, Anodonta (Colletopterum) cyrea subsp. sogdiana, Corbicula fluminalis, C. purpurea, Cyrena (Corbicula) cor, are adapted to live in the middle and lower reaches of the Sangzor River. Although they are distributed in the middle part of the river, the poor hydrological regime of the lower reaches and the high level of pollution affect their distribution.

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Список литературы:

1. Thorp J. H., Covich A. P. Ecology and classification of North American freshwater invertebrates. Academic Press //San Diego, California. 2001.

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3. Bouchet P. Inventorying the molluscan fauna of the world: how far to go // Abstracts of the World Congress of Malacology. Antwerp, Belgium. 2007.

4. Huber M. Compendium of Bivalves 2. A full-color guide to the remaining seven families. A systematic listing of 8'500 bivalve species and 10'500 synonyms. ConchBooks, 2015.

5. Bogan A. E. Mollusca Bivalvia. 2010.

6. Cuttelod A., Seddon M., Neubert E. European red list of non-marine mollusks. Luxembourg: Publications Office of the European Union, 2011. P. 97. https://doi.org/10.2779/84538

7. Haws M. The basic methods of pearl farming: a layman's manual. Hilo, HI: Center for Tropical and Subtropical Aquaculture, 2002. P. 5-13.

8. Bogatov V. V., Starobogatov Y. I. Genus Corbicula in the Amur River (Bivalvia, Corbiculidae) // Ruthenica, Russian Malacological Journal. 1994. V. 4. №2. P. 147.

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12. H. Boymurodov, Kh. Jabborov, T. Jabbarova, B. Aliyev, O. Mirzamurodov, A. Egamqulov. Changes in the habitats of the Unionidae, Euglesidae, Pisidiidae and Corbiculidae species with the construction of reservoirs in the Kashkadarya basin due to climate change // Reliability: Theory & Applications. 2022. V. 17. №SI 4 (70). P. 343-347.

13. Boymurodov H. Distribution and ecological groups of bivalve mollusks of the families Unionidae and Corbiculidae in the aquatic ecosystems of the Kyzylkum nature reserve. Reliability // Reliability: Theory & Applications. 2022. V. 17. №SI 4 (70). P. 562-566.

Boymurodov H.Т. Biological biodiversity of bivalve and distribution of water resources which built by humanity // Uzbekistan biological journal. 2010. №6. P. 41-44.

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