Volume 04 Issue 10-2024
118
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
04
ISSUE
10
Pages:
118-121
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
ABSTRACT
The article provides information on the factor, clarity and flow rate of the Sangzor River, which influence the
distribution of molluscs, in which the temperature, clarity and flow rate of the Sangzor River vary in different parts of
the river.
KEYWORDS
Population, weight. abiotic, shell mollusk, density, River, charorat, indicator.
INTRODUCTION
The distribution and development of bivalve molluscs
on the coast of Sangzordarya is influenced in a complex
way by external environmental factors, especially
abiotic factors in water. Abiotic, biotic and
anthropogenic factors play an important role in the life
of bivalve molluscs. Factors affecting the distribution
and development of bivalve molluscs found in
freshwater have been studied by scientists. [1, 6, 8.]
We found out that the coast of Sangzordaryoi consists
of three parts, 7 types of bivalve mollusks are
distributed in the upper part, 11 types in the middle
part, and 2 types of bivalve molluscs in the lower part.
Research Article
EFFECT OF SANGZOR RIVER WATER TEMPERATURE, CLARITY AND
FLOW RATE ON BIVALVE MOLLUSCS
Submission Date:
October 20, 2024,
Accepted Date:
October 25, 2024,
Published Date:
October 30, 2024
Crossref doi:
https://doi.org/10.37547/ajast/Volume04Issue10-18
A.A.Azamqulov
Assistant, Jizzakh Polytechnic Institute, Jizzakh, Uzbekistan
Izteliov Gani
dos, M.South Kazakhstan unveristet named after Avezov, Uzbekistan
Journal
Website:
https://theusajournals.
com/index.php/ajast
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 04 Issue 10-2024
119
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
04
ISSUE
10
Pages:
118-121
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
Picture 1
Picture 1. Distribution of bivalve molluscs in river sections
Differences in water temperature, clarity, and flow
speed in different parts of the river are factors
influencing the distribution of molluscs.
It was observed that the water temperature varies in
different parts of the Sangzor river. For example, in
spring and summer, the water temperature in the
upper part of the river is on average 9-11 0C, in the
middle part 18-22 0C, and in the lower part 18-24 0C. It
was found that the middle part is a favorable area for
the distribution of molluscs. The number of mollusk
species in the upper and lower parts is small. Species
distributed in the lower part are considered species
with a wide range.
River water temperature plays an important role in the
development and distribution of bivalves of the
Euglisidae and Pisidiidae families. On the coast of the
Sangzor River, rising water temperature in spring
ensures
better
development,
nutrition
and
reproduction of bivalve molluscs. It was found that the
number of bivalve mollusc species is the highest in the
middle part of the Sangzor river bank compared to the
upper and lower parts.[4.] In summer, we measured
the average water temperature in the middle part of
the river to be 18-220C. Water temperature plays an
important role in the development of molluscs on the
banks of the Sangzor River. 1988 Antonova L.A. in
water types of the Volga River coast, the reproduction
stages of species belonging to the Unionidae family
Volume 04 Issue 10-2024
120
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
04
ISSUE
10
Pages:
118-121
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
were specially studied depending on the temperature
of the water, they observed that depending on the
temperature, they pass the development stage from 0
to 4 on a 5-stage scale. As a result of our observations,
it was learned that under the influence of the water
temperature of the Sangzor River, the development of
species of the Unionidae family is in stages from 0 to 4:
in March, gametogenesis takes place in the 1st stage of
gametogenesis; the first ten days of April, the growth
of germ cells is 2 stages; 3 stages of spawning period at
the beginning of May; in June, howling continues in 4
stages; At the end of June, bivalve molluscs develop to
stage 0.
We observed that water temperature also affects the
filtration activity of bivalve molluscs on the coast of the
Sangzor River. It is known from the literature that a
decrease in water temperature slows water filtration in
molluscs, most of them completely stop filtering water
when the temperature of water bodies reaches
+2+50С. In species of the Unionidae family, the filtering
ability of water at +40 C is greatly reduced. In the
species of the Euglisidae family, it was found that the
ability to filter water at +4.6+5.90С is very low. [5.]
Bivalve molluscs are mainly active in the water
filtration process in shallow coastal zones.
The average water temperature in the Sangzor River in
autumn is 10-120 C. At this time, water filtration of
bivalve molluscs is reduced. In the winter season, the
average water temperature in the upper part of the
river is +1-20 C, and in the lower part it is 4-50 C. Jizzakh,
Zomin reservoirs located in the middle reaches of the
Sangzor river bank, some small canals and collectors
pour their water into the river. The water of these
canals and collectors is 3-40C warmer in summer and 1-
20C in winter compared to river water. These cause an
increase in the temperature of the river water
downstream.
Different water temperatures in different parts of
Sangzor River coast during the seasons cause
differences in feeding and filtration activity of bivalve
molluscs. Relatively low water temperature and
relatively high flow speed in the upper part of the
Sangzor River had a limiting effect on the distribution
of species of the Unionidae family Sinanodonta and
Colletopterum genera. In the upper part of the river,
when the water temperature rises to 10-120C, we
observed a change in the breeding phase of species of
the Euglisidae family distributed in this area. [8.]
In the summer, when the water temperature reaches
14-220C in the upper part, it was observed that Euglisa
obliquata, E.turanica, E.turkestanica, distributed in the
springs, go to the highest stage of water filtration. By
autumn, the temperature of the water is 10-120C, which
leads to a decrease in mollusk nutrition. In winter, the
water temperature drops significantly. (+1+50S) we
observed that Euglycids went into hibernation state.
In the middle part of the Sangzor River, a slight rise in
temperature in spring (15-180C) leads to feeding and
reproduction of bivalve molluscs. Unionidae family
Sinanodonta,
Colletopterum
genus
species,
Corbiculidae family Corbicula and Corbiculina species
are distributed in the middle part of the river. In
summer, it was observed that the average water
temperature reaches 18-220C. We observed that the air
temperature in the middle part of the river reaches 12-
140C by autumn. In winter, the water temperature
drops significantly (1-20C). The number of species in
the upper part of the river, compared to the middle
part, can be explained by the increase in the amount of
organic matter coming to the river from the
environment in different ways, in addition to the
increase in temperature and decrease in the flow rate.
REFERENCES
Volume 04 Issue 10-2024
121
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
04
ISSUE
10
Pages:
118-121
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
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