| dc.contributor.advisor | Dr. Md. Rezoanul Haque | |
| dc.contributor.author | Salam, Md. Abdus | |
| dc.date.accessioned | 2022-04-25T06:02:36Z | |
| dc.date.available | 2022-04-25T06:02:36Z | |
| dc.date.issued | 2019-06 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/861 | |
| dc.description | Bangladesh is a small country in the world but it is rich in fisheries resources. There are many
rivers, beels, haors, baors, and ponds in this country. It is called the riverine country. Rivers
are the most important freshwater resources. They are used as many purposes such as: 1)
They supply water that provides fertile lands, which support the development of highly
populated housing areas due to its favorable conditions (Mouri et al., 2011)., ii) They make
up the main inland water body for domestic, industrial, and agricultural activities and often
bring large municipal sewage, industrial waste water discharges, and seasonal runoff from
agricultural field (Singh et al., 2004; Pradhan et al., 2009), iii) they clean huge loads of waste
from industries, domestic sewage and agricultural practices (Datar and Vashistha, 1992; Das
and Sinha, 1993) and so on. However, various anthropogenic processes are degrading our
river ecosystem physically, chemically and biologically. Therefore, it is necessary to protect
it from further degradation. | en_US |
| dc.description.abstract | The study was conducted to assess spatial and seasonal variations of some physico-chemical
parameters and plankton community of the Atrai River in Dinajpur district for a period of one
year from August 2017 to July 2018. The whole period was grouped into four seasons such as
summer, autumn, winter and spring. Samples were collected monthly from three sampling
sites named Vushi, Birga and Jhanjira assigned as site-1, site-2 and site-3, respectively. Some
physico-chemical parameters namely, air and water temperature (°C), transparency (cm),
depth (m), pH, dissolved oxygen (mg L-1
) and alkanity (mgL-1
) and plankton community
were determined both at the field level and at the laboratory of the faculty of Fisheries, Hajee
Mohammad Danesh Science and Technology University (HSTU), Dinajpur. The physicochemical parameters and plankton abundance did not vary significantly (P>0.05) among the
sites but varied significantly (P<0.05) among seasons. However, all the physico-chemical
parameters were within the acceptable limits for fishes, except transparency. The mean values
of air temperature (°C)varied from 22.04±2.25 to 31.04±1.830C water temperature (°C)varied
from 21.02± 2.29 to 30.24±1.990C and water transparency varied from 54.37± 9.98 to
67.74±13.58 cm. Water depth (m) was highest (6.66±1.34 m) in autumn andlowest (1.95± .17
m) in summer. The level of water of the river was influenced byseason. The pH value varied
from 7.67±.53 to 9.42±.35 in autumn and winter, respectively. Dissolved oxygen
concentration washighest (9.62±1.01 mg/L) in winter andlowest(8.69±.96 m/L) in autumn.
The mean values of total alkalinity (mgL-1
) varied from 29.18± 6.75 to 45.19± 2.90 mg/L in
the present study. Total 28 phytoplankton genus identified of which 11 belongs to
Chlorophyceae, 11 to Bacillariophyceae, 4 to Cyanophyceae and 2 to Euglenophyceae.
Similarly, 9 genus of zooplankton were identified of which 3 belongs to Rotifera, 3 to
Cladocera and 2 to Copepoda and 1 to Nauplius, the crustacea larvae. The number of genera
and density of plankton showed sky-scraping seasonal variation during winter and summer.
The overall density of plankton community were higher throughout the winter
season.However, phytoplankton abundance was higher in winter and zooplankton in Autumn
season. From this study, it can be concluded that physico-chemical parameters remain an
acceptable range all the year but the plankton densities varies seasonally with higher in winter
and lower in summer. This information could be helpful for further research work and
fisheries management point of view. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMOD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR | en_US |
| dc.subject | SOME PHYSICO-CHEMICAL | en_US |
| dc.subject | PLANKTONIC COMMUNITY | en_US |
| dc.subject | THE ATRAI RIVER | en_US |
| dc.title | SPATIO-TEMPORAL VARIATION OF SOME PHYSICO-CHEMICAL PARAMETERS AND ABUNDANCE OF PLANKTONIC COMMUNITY IN THE ATRAI RIVER, DINAJPUR, BANGLADESH | en_US |
| dc.type | Thesis | en_US |
